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.............Will T5 hold LS1 bolt ons...........?????????

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Old 03-19-2008, 06:38 AM
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Question .............Will T5 hold LS1 bolt ons...........?????????

I found T5 for camaro 91 with good price and I will install it with ls1 engine bols ons + cam in the future
Can the T5 handle the power? If not how can I rebuild it so it can handle it?
Which T5 is better for mustang or chevy?

Last edited by LS1SS4ever; 03-19-2008 at 07:01 AM.
Old 03-19-2008, 08:39 AM
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GM wouldn't even put the T5 behind a TPI 350 because it couldn't handle the torque.........what do you think the answer is?
Old 03-19-2008, 11:14 AM
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There's no way. I wouldn't count on it lasting more than a few runs in a stock LS1, nevermind a modded one. See the post above about the GM decision to not put it in a 350TPI motor.

Save yourself the aggravation, time, and money: save longer and buy a T56.
Old 03-19-2008, 11:57 AM
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boom! and that was back with 80's f-body stock power...

LSx stock power will shred the internals of a T-5.
Old 03-19-2008, 12:01 PM
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Something to ponder though. The t5 was used in Mustangs for many year. I know of many heads, cam, nitrous mustangs making some decent power that they hold together in. The tuned port motors I think came with a t5 behind it.
Old 03-19-2008, 12:23 PM
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Put it in then dump the clutch at 5-6k and see what happens, and make sure you get it on video.

No it will not hold for long if at all.
Old 03-19-2008, 12:52 PM
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its the 3rd gear in the T5's that will eventually take out the whole works

one of my good buddies has an 87 stang with a blower, which dynoes close to 400 at the wheels was cutting 1.6 60's at the track dumping the clutch at 5k on hoosiers

its probably had well over 100 runs on that combo before he finally took out 3rd shifting at the track

consider the T5 a 10 bolt in an Fbody, they will hold for a while for some people but eventually it will break, its inevitable especially behind an ls1
Old 03-19-2008, 01:38 PM
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Originally Posted by 1994Z28Lt1
its the 3rd gear in the T5's that will eventually take out the whole works

one of my good buddies has an 87 stang with a blower, which dynoes close to 400 at the wheels was cutting 1.6 60's at the track dumping the clutch at 5k on hoosiers

its probably had well over 100 runs on that combo before he finally took out 3rd shifting at the track

consider the T5 a 10 bolt in an Fbody, they will hold for a while for some people but eventually it will break, its inevitable especially behind an ls1
Good comparison.
Old 03-19-2008, 09:15 PM
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Originally Posted by Cam72aro
Something to ponder though. The t5 was used in Mustangs for many year. I know of many heads, cam, nitrous mustangs making some decent power that they hold together in. The tuned port motors I think came with a t5 behind it.
Mustang T5's and 3rd gen T5's are not the same. The internals are different and the Chevy T5 is considerably weaker. With that said, I popped the T5 in my ***305*** powered IROC years ago.
Old 03-19-2008, 09:33 PM
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Internals are the same. Input, output, and casings are different. But it is unwise to put any T5 behind most any motor with decent power. Torque and powershifting kill those little boxes. You can build them stronger, G-force make a heavy duty internal kit. But for the price, the T56 is vastly superior.
Old 03-19-2008, 09:46 PM
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Originally Posted by Mike94ZLT1
Mustang T5's and 3rd gen T5's are not the same. The internals are different and the Chevy T5 is considerably weaker. With that said, I popped the T5 in my ***305*** powered IROC years ago.
Interesting.. Thanks for the insight. Josh
Old 03-19-2008, 09:51 PM
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If you can break anything with a 305 it must be a turd. Putting a T5 behind a bolt on LS1 would be like building a cruise ship with a 8 layer titanium hull and drilling the bow full of holes. Its just not really a good idea.
Old 03-19-2008, 11:31 PM
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Originally Posted by Uncle Skeletor
Internals are the same. Input, output, and casings are different. But it is unwise to put any T5 behind most any motor with decent power. Torque and powershifting kill those little boxes. You can build them stronger, G-force make a heavy duty internal kit. But for the price, the T56 is vastly superior.
I consider the input and outputs to be internal :p But yes, the case design is a large factor, the Mustang case is much beefier and will not give like the Chevy.
Old 03-19-2008, 11:58 PM
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The weakness of the T-5 lies in it's case. It simply can't hold the torque that is applied to it. It's not the clutch dump that kills it (on the 3rdgens at least), it's the later shifts, a powershift to 3rd or 5th will usually doom it. It literally flexes and the internals move around and shred themselves.

This is why the 350's were never mated to it, it can spin up, but NOT deal with a significant amount of torque increase. LSx engines are torque monsters. from 2500rpm onward. Imagine the grenade that'll come out of that combo...
Old 03-20-2008, 12:03 AM
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Originally Posted by jmm98LS1
GM wouldn't even put the T5 behind a TPI 350 because it couldn't handle the torque.........what do you think the answer is?
He is right...If I remember correct the 350 TPI put out around 240 lb ft of torque and a bolt on LS1 would be somewhere around 350 to 375 and thats low balling. I wouldnt waste the time honestly.
Old 03-20-2008, 11:25 AM
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Originally Posted by MrElectric03
He is right...If I remember correct the 350 TPI put out around 240 lb ft of torque and a bolt on LS1 would be somewhere around 350 to 375 and thats low balling. I wouldnt waste the time honestly.
wow i hope you're not one of the same guys that complains about people calling your ls1 a 350 when its really a 346 or any other misinformation that comes out of their mouths

maybe you just hit the wrong key but the TPI 350 in its best form was rated at 340 tq, not 240
Old 03-20-2008, 12:51 PM
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My 88 305 put out 261ft/lbs at the WHEELS. That was TBI and Auto to boot.

There's no way a healthy TPI 350 would put out less than a 305.
Old 03-20-2008, 01:11 PM
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The "hottest" TPI 350 was rated at 240hp 340tq and fell flat on it's face above 4500rpm.
Old 03-20-2008, 07:40 PM
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Originally Posted by 1994Z28Lt1
wow i hope you're not one of the same guys that complains about people calling your ls1 a 350 when its really a 346 or any other misinformation that comes out of their mouths

maybe you just hit the wrong key but the TPI 350 in its best form was rated at 340 tq, not 240
Your right...I got mixed up. The 88 IROC 350 TPI tht I had was rated at 230hp and 330lb. ft. of torque. Sorry i got all mixed up. Either way the T5 really didnt even hold the 290lb.ft. that the 305 TPI put out.
Old 03-20-2008, 09:33 PM
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I know a guy that had 400ft/lb to the wheels and ran a T-5... speed shifts!

Unfortunately he killed it in one shot with a powershift to 5th. First and last time too he did that hah

Runs a T-56 now.


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