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Old 07-25-2011, 12:05 AM
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stock 5 speed trans. with a 400 hp 350

I have a 1986 Trans Am with a 350 crate motor and the car has the stock 5 speed trans. a lot of people told me that the stock trans. will not last long but the car has had around 50,000 miles put on it with the 400 hp 350 and (trans. has 118,xxx miles) the trans is just as good as it was when the car had 20,000 miles and the stock 305

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Old 07-25-2011, 09:44 AM
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You probably don't abuse it much, if at all. I think that T5 is rated for around 325 ft./lbs. of torque.
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Old 07-25-2011, 10:30 AM
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Quote:
Originally Posted by Camarorider
I have a 1986 Trans Am with a 350 crate motor and the car has the stock 5 speed trans. a lot of people told me that the stock trans. will not last long but the car has had around 50,000 miles put on it with the 400 hp 350 and (trans. has 118,xxx miles) the trans is just as good as it was when the car had 20,000 miles and the stock 305
One strike against that tranny, it's not the "World Class" (WC) transmission. F-body GM's didn't use the WC T5 until '88, IIRC. The Mustang/Cougar/Thunderbird had the WC as early as '85, I believe.

If you don't hook up well you'll be OK until it wears out. Avoid spinning on grass, say, then pulling out onto tarmac- the sudden load can break it. And don't plan on sidestepping the clutch or using a trans brake, or slicks, etc. A hard launch can do it in- like if you were to use drag-type rubber on a prepped track surface.

Frequent oil changes (like every 15-20K mi.) w/good synthetic gear lube (NOT ATF like the WC T5 uses) may extent the life a bit.
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Old 07-25-2011, 12:27 PM
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Could be the motors not as strong as you think it is. Have you had it dyno'd? These transmissions are weak, and any spirited driving with an engine over the torque rating will break it.. It's ither never been beaten on, or never subject to torque loads over the maximum torque rating, unless your car has a huge cam and lacks the bottom end, because torque/hp at the top end won't hurt it much.
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Old 07-25-2011, 01:14 PM
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Quote:
Originally Posted by willowbilly3
You probably don't abuse it much, if at all. I think that T5 is rated for around 325 ft./lbs. of torque.
I dont abuse it much(it hard not to abuse) and on the dyno it put out 380 hp and 304 lbs of torque
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Old 07-25-2011, 01:18 PM
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Quote:
Originally Posted by matt167
Could be the motors not as strong as you think it is. Have you had it dyno'd? These transmissions are weak, and any spirited driving with an engine over the torque rating will break it.. It's ither never been beaten on, or never subject to torque loads over the maximum torque rating, unless your car has a huge cam and lacks the bottom end, because torque/hp at the top end won't hurt it much.
yes I hade it dyno'd it 380 hp 304 ft/lbs of torque
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Old 07-25-2011, 02:02 PM
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Forget the trans brake comment above- save that advice for keeping the rear end from letting go- the 7.5" diff is as notoriously weak as the tranny, unfortunately.

380 hp 304 ft/lbs of torque would make for an interesting looking graph.

Last edited by cobalt327; 07-25-2011 at 02:11 PM.
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Old 07-25-2011, 11:53 PM
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Quote:
Originally Posted by cobalt327
Forget the trans brake comment above- save that advice for keeping the rear end from letting go- the 7.5" diff is as notoriously weak as the tranny, unfortunately.

380 hp 304 ft/lbs of torque would make for an interesting looking graph.
ill get the papers out and take a look It has been a long time my brother told me thats what is was ill check it out
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Old 07-26-2011, 05:06 AM
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Quote:
Originally Posted by Camarorider
ill get the papers out and take a look It has been a long time my brother told me thats what is was ill check it out
Normally you'd expect a 380 HP 355 SBC to peak about a hundred more ft/lb torque than that.

A quick check says the GMPP 350 cid SBC crate engine p/n 12499529 has 290 HP @ 5100 RPM, and 326 ft/lb torque @ 3750 RPM, so you can see something ain't quite right.
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Old 07-26-2011, 08:35 AM
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Even the WC T5 wasnt available behind the TPI 350 and that thing was a stump puller back then. A lot of 3rd generation f body people do the T56 swap, which isnt bad in a 3rd gen if you have a lift or a couple of buddies; just make sure you get the earlier LT1 style T56 to start with, otherwise you have to get the right input, the right front plate and while you're in there at that that point, new rings and the steel 3/4 fork upgrade. For that motor I wouldnt be concerned about the billet synchro struts and bronze fork pads.

Me? Id stick with a T5 and just take it for what it is, a nice street driver.

Cobalt is correct on the 7.5 being 'weak' by performance standards, however if you look at the 300 or so HP you were struggling to get back then, its sized relatively appropriate. You may have the B/W 9 bolt which is better, but is australia based and parts are difficult. Most people yank an axle from a 4th gen, with the disc brakes. Just remember your bolt patterns and offsets may be different at that point.
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Old 07-26-2011, 10:16 AM
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Quote:
Originally Posted by cobalt327
Normally you'd expect a 380 HP 355 SBC to peak about a hundred more ft/lb torque than that.

A quick check says the GMPP 350 cid SBC crate engine p/n 12499529 has 290 HP @ 5100 RPM, and 326 ft/lb torque @ 3750 RPM, so you can see something ain't quite right.
I have looked for the dyno sheet and cant find it.the motor is bored .30 over and I called my brother and he told me it may have been 404 ft/lb I may just take it back to the dyno
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Old 07-26-2011, 10:55 AM
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Why waste your money on a dyno? Take it to the strip and do the math.
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