Coreys 89 Firebird LT1/T5 Swap
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Coreys 89 Firebird LT1/T5 Swap
Hey Everyone,
I picked up my first 3rd gen f body in June of this year. After driving it for a while i decided that the tired 305/700r4 wasn't going to do the trick. This is my first project this big. I decided on the LT1. Im using a 95 LT1/Harness/PCM. I also decided I wanted a standard transmission. I wasn't able to find a t56 locally that wasnt crazy expensive so i ended up buying a full 90 firebird for the trans swap and a few other parts I needed.
Planned Mods;
58MM Throttle Body
Ported intake/heads/valve job
Comp CC503 Cam
Lunati dual valve springs
Comp NSA 1.6 Roller tip rockers
Trick Flow guide plates
Hedman shorties and y pipe, cat delete and 3 inch magnaflow cat back
EGR/AIR system delete
3.23 posi/disc brake rear end (from a 4th gen)
I had the bottom end rebuilt at a local machine shop. I had another shop do the porting and valve job on a set of aluminium heads i bought. I'm expecting to pick up the heads this week and finishing the engine assembly.
The car
dyno sheet before swap. stock 305/700r4
new bearings, fork pads and cleaned up t5
I picked up my first 3rd gen f body in June of this year. After driving it for a while i decided that the tired 305/700r4 wasn't going to do the trick. This is my first project this big. I decided on the LT1. Im using a 95 LT1/Harness/PCM. I also decided I wanted a standard transmission. I wasn't able to find a t56 locally that wasnt crazy expensive so i ended up buying a full 90 firebird for the trans swap and a few other parts I needed.
Planned Mods;
58MM Throttle Body
Ported intake/heads/valve job
Comp CC503 Cam
Lunati dual valve springs
Comp NSA 1.6 Roller tip rockers
Trick Flow guide plates
Hedman shorties and y pipe, cat delete and 3 inch magnaflow cat back
EGR/AIR system delete
3.23 posi/disc brake rear end (from a 4th gen)
I had the bottom end rebuilt at a local machine shop. I had another shop do the porting and valve job on a set of aluminium heads i bought. I'm expecting to pick up the heads this week and finishing the engine assembly.
The car
dyno sheet before swap. stock 305/700r4
new bearings, fork pads and cleaned up t5
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Moonlight137 (12-23-2019)
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Got my head's back from the machine shop today. Lunati springs installed, cleaned up the valves and valve job.
I've got the old engine and trans ready to pull. Hopefully get that out this week coming and start cleaning up the engine bay.
I've got the old engine and trans ready to pull. Hopefully get that out this week coming and start cleaning up the engine bay.
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Coreys 89 Firebird LT1/T5 Swap
Looks like it'll be a fun project!
#6
Re: Coreys 89 Firebird LT1/T5 Swap
Nice Firebird. I had an 89 Iroc once, and I like that year model.
Reasonably priced T56 transmissions are indeed hard to find. I eventually spotted one on Craigslist, but it was in Oklahoma (I live in Texas). So, I did a road trip and bought it. A little while later, I learned that LT and LS T56’s are different. Whoops! I took it to Texas Drivetrain Performance for upgrades and the LS style conversion. A long road but worth it.
Reasonably priced T56 transmissions are indeed hard to find. I eventually spotted one on Craigslist, but it was in Oklahoma (I live in Texas). So, I did a road trip and bought it. A little while later, I learned that LT and LS T56’s are different. Whoops! I took it to Texas Drivetrain Performance for upgrades and the LS style conversion. A long road but worth it.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
thats an unfortunate lesson to learn but at least it can be fixed. I still have my eyes open for the T-56. If I can find one for the right price within 12-14 hours driving distance ill jump on it. Unfortunately the only ones that turned up so far were 3500+ just for the transmission, then I would still have to find the rest of the parts for the swap and do the ls to lt conversion.
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#8
Re: Coreys 89 Firebird LT1/T5 Swap
I considered the T5 option. It’s a controversial subject as some are convinced that the T5 are too fragile. T5’s are cheap, and a company called G-force makes upgraded components and trans case. The case is what usually fails when engine power is upgraded. Most of their products are for Ford Mustangs. They do make GM versions but they don’t advertise the price. The Ford case is $300.
http://www.gforcetransmissions.com/p...ngT-5.indd.pdf
http://www.superchevy.com/how-to/suc...mission-build/
https://www.jegs.com/p/G-Force-Trans...43712/10002/-1
http://www.gforcetransmissions.com/p...ngT-5.indd.pdf
http://www.superchevy.com/how-to/suc...mission-build/
https://www.jegs.com/p/G-Force-Trans...43712/10002/-1
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
I did consider g-force. I'm hopeful it will last long enough to find a 6 speed. Theres lots of guys local to me running T-5 on SBC and LS swaps without issues. They all say the same thing, avoid doing 5k clutch dumps and power shifting. But, if it goes, then ill have to figure something out. I'm also keeping my 700r4, just in case I blow up the t5, that way the car doesnt have to sit for weeks!
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Car: 1987 Trans am
Engine: 350 Vortec Stealth Ram
Transmission: T-5
Axle/Gears: 02 SS Torsen Zexel 3.42
Re: Coreys 89 Firebird LT1/T5 Swap
I'm doing this exact same swap almost down to the same car. Although mine got put on hold due to buying a house. I was luckily enough to find and drive home a 95 Formula with a T56 for a good price. Right rear was smashed but it made the 30-mile trip no problem. I'll be following your build thread very closely.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
I'm doing this exact same swap almost down to the same car. Although mine got put on hold due to buying a house. I was luckily enough to find and drive home a 95 Formula with a T56 for a good price. Right rear was smashed but it made the 30-mile trip no problem. I'll be following your build thread very closely.
Im still watching for the right deal on the t-56 to come along. If it does ill grab it and sell the T5. Do you have a thread for your build?
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Couple more pictures . Got the engine and transmission out today . Also starting to assemble the engine. Just waiting on a new oil pump pickup screen
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Re: Coreys 89 Firebird LT1/T5 Swap
EFI Connection, at the time the only options. Its been on the car since around '09. Being a 93 it was similar to the later TPI cars but no one really wanted to mess with tuning it. The opti wasn't the issue it was finding localized tuning support.
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Car: 1987 Trans am
Engine: 350 Vortec Stealth Ram
Transmission: T-5
Axle/Gears: 02 SS Torsen Zexel 3.42
Re: Coreys 89 Firebird LT1/T5 Swap
Unfortunately I haven't started one yet .Right now it'd be so spread out and not updated frequently with the house. I'll probably start one up when I get moving on it again .
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Well not much progress with the holidays. Cleaned up the engine bay since we had a warm day. Now to fix up the battery tray and paint it.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
This being my first swap I thought it would be more straight forward then the LS swap. I didn't need to find a bunch of extra parts (headers, oil pan, front accessory drive, mounts) . There's not much LS f body stuff available locally and shipping to return Canada can be killer so I would've had to buy most of the above mentioned stuff new.
Plus this gives me the ability to try my hand at tuning my own car without having to fork out 800 dollars for HP tuners.
this whole thing has been a big learning experience for me .I've never rebuilt an engine, nor have I done a swap like this. Plus I have a spare LT1I can drop in if I blow this one up haha.
Plus this gives me the ability to try my hand at tuning my own car without having to fork out 800 dollars for HP tuners.
this whole thing has been a big learning experience for me .I've never rebuilt an engine, nor have I done a swap like this. Plus I have a spare LT1I can drop in if I blow this one up haha.
#20
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Re: Coreys 89 Firebird LT1/T5 Swap
You have a great looking formula and the Lt1/5 speed will make it even better.
I also went with an Lt1 because I already had the engine,pcm,wiring,and tuner cats.
I really love the Lt1,I know it has a bad reputation due to the optispark,but my ebay opti has been doing good for over two years now.
I also went with an Lt1 because I already had the engine,pcm,wiring,and tuner cats.
I really love the Lt1,I know it has a bad reputation due to the optispark,but my ebay opti has been doing good for over two years now.
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Car: 1987 Trans am
Engine: 350 Vortec Stealth Ram
Transmission: T-5
Axle/Gears: 02 SS Torsen Zexel 3.42
Re: Coreys 89 Firebird LT1/T5 Swap
This being my first swap I thought it would be more straight forward then the LS swap. I didn't need to find a bunch of extra parts (headers, oil pan, front accessory drive, mounts) . There's not much LS f body stuff available locally and shipping to return Canada can be killer so I would've had to buy most of the above mentioned stuff new.
Plus this gives me the ability to try my hand at tuning my own car without having to fork out 800 dollars for HP tuners.
this whole thing has been a big learning experience for me .I've never rebuilt an engine, nor have I done a swap like this. Plus I have a spare LT1I can drop in if I blow this one up haha.
Plus this gives me the ability to try my hand at tuning my own car without having to fork out 800 dollars for HP tuners.
this whole thing has been a big learning experience for me .I've never rebuilt an engine, nor have I done a swap like this. Plus I have a spare LT1I can drop in if I blow this one up haha.
You painting your engine bay?
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Thanks! Im a little nervous about the opti-spark, but I have several on hand. 2 AC-Delco units and an MSD so i should be able to have at least one always working!
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
I agree, Being I came across all my LT1/T56 stuff for a good price I'm going that direction. Had LS been more practical price wise, probably would have went that route. I wouldn't even be able to use my LT1 T56 without converting it for about $550.
You painting your engine bay?
You painting your engine bay?
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Made some more progress today. Painted my intake manifold then polished the top fins and fuel rails. I think it's looking good!!
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Car: 1987 Trans am
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Axle/Gears: 02 SS Torsen Zexel 3.42
Re: Coreys 89 Firebird LT1/T5 Swap
Looking good! I went to the dark side (LS1/T56) for a price I couldn't pass up. I'll still be following!
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Only a bit of progress .Got the timing cover and oil pan on .Went to check pushrod length and when I was installing my ticket arms I found out they won't work. (they were comp 1416-16 for pre 88 SBC). Now I'm waiting on some new Harland sharp 1.5 full roller rockers .
Been picking away at the engine bay getting it ready to paint, removed the brake pedal assembly and an getting ready to cut the firewall for clutch/master cylinder.
Sat the intake and valve covers on just to see how it would look.
Been picking away at the engine bay getting it ready to paint, removed the brake pedal assembly and an getting ready to cut the firewall for clutch/master cylinder.
Sat the intake and valve covers on just to see how it would look.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
I'll have more pics sheet the weekend. Started on wiring and painting the engine bay.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Made some progress.
- painted engine bay, heater box, strut mounts and engine cradle.
- Installed the manual pedals and cut the firewall and installed the master cylinder. Clutch switch also wired.
- Put a patch on the driver side floor.
- De loomed both wiring harness and stripped out unneeded wires .
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Car: 1987 Trans am
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Axle/Gears: 02 SS Torsen Zexel 3.42
Re: Coreys 89 Firebird LT1/T5 Swap
Looking good. What'd you use for paint and did you do and prepping? I'll be painting my bay as well this week.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
I sanded and primed any spots that were rusty. Then I sanded the rest of the engine bay . Then I wiped the bay down with some thinner to get all the dust and sprayed it. I used color match spray cans from the local auto parts store
I'm no body man but I think it turned out ok.
I'm no body man but I think it turned out ok.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Got the rear end out today. Need to order some new sway bar links and bushings . Also on the lookout for some after market lca's. Anyone here have any recommendations?
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Haven't updated in a bit. Started on the wiring today. Still waiting on rocker arms, pushrods, fuel pump and a few odds and ends for my rear brakes. Hopefully all my parts will be in this week and next week I'll really start making progress.
Following pockets directions on making an LT1 harness. I took the original harness apart and am laying each sensor harness on individually . I'm just about done that step, then I'll add ignition power and the rest of the grounds. That'll take care of the bulk of the lt1 harness.
Following pockets directions on making an LT1 harness. I took the original harness apart and am laying each sensor harness on individually . I'm just about done that step, then I'll add ignition power and the rest of the grounds. That'll take care of the bulk of the lt1 harness.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Got my engine harness finished up .Mocked it up on the engine stand and made some adjustments. There was lots of great info on this forum that helped. Now I have to combine it with my third gen harness and loom it. I'll wait and do that once the engine is in the car .
I had planned to put my firm tank and rear end back in this weekend but my pump install kit didn't come in. I may end up putting the engine in while I wait. I'll update again soon.
I had planned to put my firm tank and rear end back in this weekend but my pump install kit didn't come in. I may end up putting the engine in while I wait. I'll update again soon.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Been a while since I updated. Made progress and had a few setbacks. Ended up having to replace the oil pump. When I primed the engine the pump was very noisy and felt rough when turning the shaft. I pulled the pump off and found it full of burrs with lots of imperfections on the gears. Decided to use a known good GM pump.
Distributor and balancer installed. I ended up painting the balancer black.
4th gen rear in. Lowering springs, panhard bar and LCAs also installed
Painted accessories
Distributor and balancer installed. I ended up painting the balancer black.
4th gen rear in. Lowering springs, panhard bar and LCAs also installed
Painted accessories
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Engine is in! Trans is in too but I didn't take any pictures yet!
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Been a while since I updated this thread. Lots of progress. Wiring is almost complete, just looming in the engine bay and finishing up under the dash. Engine, trans, rear end are all in and ready to go. Had to order a U joint, once that arrives ill put the drive shaft back in.
Exhaust is the next "big" hurdle. My headers are on, My y pipe has the o2 sensor bungs welded in I just need to put it on and connect it to the rest of the exhaust.
Im hoping to start the car sometime in the next week!
Hole cut for shifter. Got a deal on a hurst shifter so once that arrives ill be able to put the interior back together.
4th gen coolant reservoir
This is what im using for wire loom
a big mess of wires. this will all be loomed and hidden under the dash.
Exhaust is the next "big" hurdle. My headers are on, My y pipe has the o2 sensor bungs welded in I just need to put it on and connect it to the rest of the exhaust.
Im hoping to start the car sometime in the next week!
Hole cut for shifter. Got a deal on a hurst shifter so once that arrives ill be able to put the interior back together.
4th gen coolant reservoir
This is what im using for wire loom
a big mess of wires. this will all be loomed and hidden under the dash.
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Car: 1989 Firebird
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Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Well I havent updated this in a while. I got the car put back together and running. Had a few bugs here and there but nothing too serious. I have been doing some street tuning, going to have it dyno tuned next week. I ended up doing a 24x conversion so I could use the newer pcm. No one locally wanted to touch it with the opti spark, plus i feel the 24x might be easier to work with down the road.
Hurst Shifter installed
amazon washer fluid bottle. I didnt want the big bulky one there as eventually my intake filter will be in this area
first time out of the garage under its own power. Dont mind the fan, just trying to keep it cool.
Hurst Shifter installed
amazon washer fluid bottle. I didnt want the big bulky one there as eventually my intake filter will be in this area
first time out of the garage under its own power. Dont mind the fan, just trying to keep it cool.
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Car: 1989 Firebird
Engine: 305 tbi
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Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Heres an idle video. This is after i did my first drive, im working on the VE tables doing some open loop data logging.
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Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
Got a few miles on the engine now. Had it in to the local tuner to get a dyno tune. 290 HP and 295 tq at the wheels on a Mustang dyno
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Car: 1989 Firebird
Engine: 305 tbi
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Axle/Gears: 3.43
Re: Coreys 89 Firebird LT1/T5 Swap
CONTINENTAL 63906 (3/4 inch)
GATES 28466 (5/8 Inch)
For the hose unions i used
DORMAN47094 (5/8 to 5/8)
DORMAN47080 (3/4 to 5/8)
Then i just ran 5/8 bulk heater hose to the water pump.