400 sbc?
Joined: Aug 2006
Posts: 12,812
Likes: 109
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: 400 sbc?
bone stock 400's are turds. But a t5 wont last behind anything if you beat on it even a little.
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Joined: Dec 2007
Posts: 862
Likes: 1
Car: 92 25th anv camaro rs
Engine: 305 tbi
Axle/Gears: 3.08s non posi
Re: 400 sbc?
umm...so your saying even a 305 could damage it if not driven propelly. no offense but i think everyone nows that. if i drive the 400 correctly will the t-5 witstand it?
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Joined: May 2006
Posts: 319
Likes: 2
From: Grand Junction, Co
Car: '83 WS6 T/A 65,000 miles
Engine: 5.0L vin H stock, 406SBC right now
Transmission: T-5
Axle/Gears: Corp. 3.73
Re: 400 sbc?
My 83 305 was modded with cam, intake and exhaust mods. Stock-ish tires and 3.73 factory axle. It ran high/mid 14s with NO traction and maybe 225-230 hp. I street raced it and cruised it for 60,000 miles. The syncs were dead and the gears were worn, the bearings were dead and noisey too. I can speed shift with the best of them but the trans finally ended up in three pieces. Unless you're only driving in a very conservitive and sane manner the trans will die sooner or later behind the torque of a 400.
Joined: Aug 2006
Posts: 12,812
Likes: 109
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: 400 sbc?
then why ask, you aparently know the answer already.
The t5 will work fine and last forever if the car is just driven normally, using the clutch to shift, no high rpm shifting/clutch-dumping ect. Its when you start beating on it thats problems arise. Its just way to small and the case flexes too much, gears misalign and boom.
The t5 will work fine and last forever if the car is just driven normally, using the clutch to shift, no high rpm shifting/clutch-dumping ect. Its when you start beating on it thats problems arise. Its just way to small and the case flexes too much, gears misalign and boom.
Member



Joined: May 2006
Posts: 319
Likes: 2
From: Grand Junction, Co
Car: '83 WS6 T/A 65,000 miles
Engine: 5.0L vin H stock, 406SBC right now
Transmission: T-5
Axle/Gears: Corp. 3.73
Thread Starter
Banned
iTrader: (6)
Joined: Dec 2007
Posts: 862
Likes: 1
Car: 92 25th anv camaro rs
Engine: 305 tbi
Axle/Gears: 3.08s non posi
Re: 400 sbc?
then why ask, you aparently know the answer already.
The t5 will work fine and last forever if the car is just driven normally, using the clutch to shift, no high rpm shifting/clutch-dumping ect. Its when you start beating on it thats problems arise. Its just way to small and the case flexes too much, gears misalign and boom.
The t5 will work fine and last forever if the car is just driven normally, using the clutch to shift, no high rpm shifting/clutch-dumping ect. Its when you start beating on it thats problems arise. Its just way to small and the case flexes too much, gears misalign and boom.
lol i think i might of said that wrong but thank you and thank you GICATA
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Thread Starter
Banned
iTrader: (6)
Joined: Dec 2007
Posts: 862
Likes: 1
Car: 92 25th anv camaro rs
Engine: 305 tbi
Axle/Gears: 3.08s non posi
Re: 400 sbc?
that must of been fun. but question will a turbo 350 or 400 hold up to a 400 sbc? you know with out the boom
Joined: Aug 2006
Posts: 12,812
Likes: 109
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: 400 sbc?
same deal, on a stock motor, you will probably never have a problem with a stock th350 or th400, once you start modding the motor, you need to upgrade the trans as well. th350/400 can be built to hold enormous amounts of power
Thread Starter
Banned
iTrader: (6)
Joined: Dec 2007
Posts: 862
Likes: 1
Car: 92 25th anv camaro rs
Engine: 305 tbi
Axle/Gears: 3.08s non posi
Re: 400 sbc?
is it possable to upgrade a t5 to with stand a modd 400 sbc? sorry for the questions but im completely lost when it comes to transimittions, and thanks for the help.
Joined: Aug 2006
Posts: 12,812
Likes: 109
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: 400 sbc?
is it possible? Yes, is it gaurenteed, no.
You can buy a modified t5 from gforce, and they even offer an upgraded case, however, these transmissions do not have a good reputation, and at a cost of 2500$ really not worth the risk when a tko600 is the came amount and will hole the power.
you can also get upgraded gear sets from a few places, buy they are very expensive as well and really dont help the case issue.
This is my favorite quote on this subject;
on a side note, 5678TA, here on tgo uses a gforce trans and upgraded case in a drag car and is running low 11's, might even be faster now, have't checked in a while. Maybe PM him and get his opinion.
You can buy a modified t5 from gforce, and they even offer an upgraded case, however, these transmissions do not have a good reputation, and at a cost of 2500$ really not worth the risk when a tko600 is the came amount and will hole the power.
you can also get upgraded gear sets from a few places, buy they are very expensive as well and really dont help the case issue.
This is my favorite quote on this subject;
originally posted by “sofakingdom”
I've heard all sorts of things about "stronger gears" and all that, from any number of sources. Thing is, I've got a shelf full of T-5s with wasted cases, that EAT any gears I can put in them. Because it's not the GEARS that are the root cause of failure, it's THE CASE. Until you strengthen the CASE, you could put in gears forged in the fiery furnaces of Hell by 10,000-year-old gnomes from an alloy of purest virgin nonobtanium with just enough irreplacium added to make them one-of-a-kind, and the case will STILL stretch and allow those gears to misalign and they'll tear up. Frankly I wouldn't spend another dime on trying to make a T-5 survive behind some power.
I've heard all sorts of things about "stronger gears" and all that, from any number of sources. Thing is, I've got a shelf full of T-5s with wasted cases, that EAT any gears I can put in them. Because it's not the GEARS that are the root cause of failure, it's THE CASE. Until you strengthen the CASE, you could put in gears forged in the fiery furnaces of Hell by 10,000-year-old gnomes from an alloy of purest virgin nonobtanium with just enough irreplacium added to make them one-of-a-kind, and the case will STILL stretch and allow those gears to misalign and they'll tear up. Frankly I wouldn't spend another dime on trying to make a T-5 survive behind some power.
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Mine ended up in 3 chunks.

