xomega

iTrader: (1)

i currently purchased a lt1 engine with the complete wiring harness for the engine and the ECU. i do believe this 90 has a machentical speedo on it. this came came with a stock 700r4 tansmission. i had the transmission rebuilt. i then ended up frying the engine so i tossed a 305 w/ 4barrel on it for a short time. now im ready to take the big step. ive had this car for some 8 or 9 years now and its became a restore project. i hear alot of people talking about VSS and the engine not running right due to the transmission and the computer. why cant you just have the ecu flashed and be done with it? i could buy a 4l60e transimssion but my funds are tight at this time of year for a transmission. im having a buddy who is a mechantic here in town help me on this project after his business hours in his shop. i will supply a link of the engine and stuff coming with it. is this gonna be a ruff swap? now reading all the posts on this forum sortta has me concerned. some seem to have great luck with it. others seem to have a very difficult time with it.

lt1

the whole power steering hose extension isnt a issue for me i have a good friend who works at a catapiller dealer who does hydraulic hose repairs.
thanks guys.

Firebat

iTrader: (7)

I'm finishing up my LT1 with 700R4 swap.

700R4 issues:

1. Need aftermarket lockup kit. Now, what you're supposed to do is change out the 4th gear switch, but i used a relay instead so i didn't have to drop the transmission pan. I'll drop it in 500 miles b/c its a new tranny. And then wired up the pressure switch. I used TCI's kit, you can get it at summitracing.com. I used a relay left over from the LT1 wiring (fog light relay). Cost for TCI kit about $80. I'll try to find the link for this.

2. Speedo.
a. Use an electronic vss and electronic speedo, and a dakota digital SGI-5 box. The SGI-5 box is $90
b. or Use a 4l60e reluctor and 4l60e rear housing and 4l60e vss, i might try this
c. or Reprogram the speedo in the PCM, i'm working on it - no one has figured this one out yet, some reason my speedo isn't working at all.

3. TV cable and throttle body
You need either a 93 tb or an aftermarket tb that has the hookup for the TV cable. I think i used a 93 TV cable but not sure, have to doublecheck. You also need a 93 throttle body bracket to hold the TV cable, found my bracket on ebay for $15. Make sure you adjust the TV cable correctly. I found a ported 52mm 93 tb off of ebay for $200.

xomega

iTrader: (1)

being the car has a mechanical speedo hook up on the 700r4. why would i need to get a vss or something of this nature. im sort of a newbie on all of this stuff. could you go into details about all this? and the kickdown tv cable. there isnt a butterfly lever or anything on it to hook a "Extended" tv cable to? if all this must be done. would it be better off to just buy a 4l60e tranny? and also if i do that. how will the speedo hook up? the 4l60e has a eletronic hook up for the speedo? or is it mechanical also? just a bit confused and looking for advice guys thanks
steven
1 last thing. what if this engine was infront of a manuel tranny origionally in the 96 fbody? would i still have issues with the ECU? and the engine functions?
whats really confusing me is. when i took the fuel injection off and turned it into a 4 barrel the speedo still worked due to the manual speedo cable on the tranny. i guess if i this lt1 wiring harness is for a auto tranny and i leave it unplugged from the tranny im gonna have problems with the engines performance unless i can have the tranny flash deleted out of the system.... <sigh> omg im getting head aches! lol

this tailshaft? http://cgi.ebay.com/ebaymotors/CHEVY...QQcmdZViewItem

Firebat

iTrader: (7)

The lt1 pcm or computer needs a vss to run properly, otherwise it will stall while driving.

The 4l60e uses a vss, sends it to the pcm and then outputs it to the speedometer.

In a 700r4, you wont use any of the wires that go to the 4l60e pigtail connector. You will need to splice the yellow and purple on the vss connector however.

If you have a 96, you're better off swapping the pcm with a 94-95 pcm, its easier to program and can be tuned to put out 10 more HP than the 96-97 pcms. If you want to put in a 4l60e, you'll either have to wire up the 4l60e connector or get a LT1 wiring harness with the 4l60e connector.

Look into madtuner.com for tuning pcms, look into www.shbox.com for wiring/schematics for LT1.

If you have a really well built 700R4 then you could keep it, otherwise get a 4l60e or a 6speed manual. Its up to you what to do with the tranny. Most don't recommend keeping the 700r4. The 4l60e has an advantage that it can have the shift points be programmed or something like that and it doesn't need a TV cable. I'm keeping my 700 b/c its built up and has a stall. Also, i looked at it moneywise, it would cost about $300-400 to keep the 700r4 and $2000 to rebuild my 4l60e since i'm no tranny mechanic. If i had a weak 700, i would be looking for a 4l60e or a 6 speed manual.

xomega

iTrader: (1)

one last question. if i go with a 4l60e tranny, will it still have a mechantical speedo hook up? or do i have to replace the speedo to a electronic?

Firebat

iTrader: (7)

if you go with a 4l60e, it would be best to go with an electronic speedo.

However, is a company that modifies the tailhousing to run a mech speedo but they are about $400 or so. There may be other alternatives also but i'm not familiar with them.

xomega

iTrader: (1)

what if this wiring harness and ecu was set up for a straight drive? would it then be a machenical hook up or still an electric?


bye theway. merry xmas guys

TexasLT1

I have no idea what you're asking here.

Check out this link for information on a coversion tail housing to allow a mechanical speedo to be used.

xomega

iTrader: (1)

wha im asking if this lt1 had a manuel transmission behind it. would it still need the VSS or would it have a mechanical speedo in the car. im thinking if this car had a manuel transmission with a mechanical speedo then it wouldnt need a vss an i could bolt a 700r4 behind it and have no problems with it stalling... ill probably talk to a local transmission shop <know a guy who works there> about adding a 4l60e tailshaft or i might just go to a salvage yard hunting for a 4l60e to be rebuilt.
i had prevously talked to a transmission shop and a local chevy dealer and they both had told me i wouldnt have any transmission problems <no stalling or anything> if i put a 700r4 behind it. but i was noticing the posts about others having issues with the engine stalling and ect with the lt1/700r4 combo. and im trying to figure out how to get my ducks in a row for this before i encounter it

TexasLT1

the LT1 PCM MUST have a VSS input to run correctly, doesn't matter if its a manual or automatic transmission.

If you are dead set on keeping the mechanical speedo, you can do a number of things to get the VSS for the PCM. As a stopgap until I swapped in a T-56, I pressed a 17 tooth sprocket onto the transmission slip yoke of the driveshaft and mounted a GM VSS directly beneath it off the stock exhaust hanger. This was connected directly to the VSS input on the PCM, worked great for about a year until I got the T-56.

Another option is from Jags that Run. they have a 40 tooth reluctor wheel that bolts onto the pinion yoke on the differential. Accomplishes the same thing just in a different way. This would be better for the automatic since the stock reluctor is 40 tooth.

xomega

iTrader: (1)

The car has the new style dash <90-92> i could swear it was cable driven. but im being told it has to be electronic to have this dash. i guess its something i need to crawl under the car and see.
http://cgi.ebay.com/ebaymotors/90-92...24528361QQrdZ1
<this is the look of the dash in the car> and also, where can i find a wiring conversion for the 96 firebird to a 90 camaro for the dash to ECU of the 90 camaro <make the 90 camaro dash wires plug into the 96 firebird ecu

TexasLT1

if it has the new dash then it is an electronic speedo. simple as that.

xomega

iTrader: (1)

it looks identical to the one i linked on ebay above! i sent you a email the other day about some other questions in this project also.

TexasLT1

sorry about not replying, I haven't been checking my e-mail much. I'll check it now and send a reply.