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Old May 10th, 2011, 11:34 AM   #1
orionn
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Default Engine/Transmision combo: How long will it last?

Like the title says, How long will this combo last? Mainly the transmision:

Rebuilt SBC 350, carbed, stock, bolted to a Jeep T-5/D300 combo turning 35" MTr's on D44's w/4:56 gears.

How well do you think the transmision will hold up?
Did this trans ever come behind a V8?

I'm a bit worried about blowing the trans up on the trails when I take it to Colorado this summer.
Nothing too radical trail wise, but some serious steep grades up and down with small ledges (less than 18") and such.

thx

Last edited by orionn; May 10th, 2011 at 11:40 AM.
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Old May 10th, 2011, 09:14 PM   #2
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Oh boy.

I've done a bit of research on this, and I can share my findings with you:
  1. The T-5, in various forms, was used with V8 engines. There are "Non world class" and "world class" T-5 transmissions that were both used behind V8s. NWC T-5 trannies were pre 93 in S-10's and (IIRC) pre-89 in the F-bodies. I'm not sure how the Jeep T-5 compares, but I'd guess it is closest to the NWC strength.
  2. The NWC trans is rated for 240 lbft of torque, I thing the highest torque rating the T-5 ever got (in a later Ford Cobra) was 305 or 320 lbft.
  3. 92 and older GM T-5's bolt up to GM bellhousings, there are a few differences between the s-10 and f-body trannies - mostly input shaft length and shift lever position.
  4. A T-5 can have money thrown at it in hopes of making it stronger, but it will always be the weak link, unless you're running a D35, then it's a toss up.
  5. A T-5 can live behind a V-8, if cared for. I'm doing the same thing for my 66 C-10, and plan on not driving like a teenager.
  6. If I were in your position, I would buy an AX-15 and a chevy adapter from Novak and be done with it. The AX-15 is a much stronger unit and I would already have one if I could find a reasonable price on a 2wd version.

YMMV,
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Old May 10th, 2011, 09:18 PM   #3
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The difference is that the mustang T5s had like 3.35 or 2.95 first gears, IIRC, compared to the 4:1 in the Jeep.

That said, I've seen plenty of 305s and 350s in front of them last for a good long time. Just depend on how you drive and how your luck is. I'd avoid clutch drops....
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Old May 11th, 2011, 06:01 AM   #4
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Thanks guys.
the combo makes me a bit nervous as I dont know the history of the tranmision.
I only need to get 7k - 8k miles maximum (most of that highway) out of it this year, and then I am swaping in a NV4500.

I'd swap transmisions now, but dont have the time or money befor my first trip this year.

I'll just have to keep my fingers crossed and be gentle with the gas pedal till I'm ready to do the swap.

Thanks Guys
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