Transmissions and Drivetrain Need help with your trans? Problems with your axle?

T5 v6 to v8 swap??

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Old Aug 7, 2006 | 10:31 AM
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CHAMPLS1's Avatar
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T5 v6 to v8 swap??

Ive got a 92 rs V6 5 speed car. I will need a V8 bell housing for the swap, what other parts will i need? Thanks in advance
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Old Aug 7, 2006 | 10:42 AM
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I assume this is a swap to a V8....

Besides the V8 BH, you'll need a V8 T-5, flywheel, and clutch.
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Old Aug 7, 2006 | 11:03 AM
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Originally Posted by sofakingdom
I assume this is a swap to a V8....

Besides the V8 BH, you'll need a V8 T-5, flywheel, and clutch.
So the V6 tranny wont bolt up to the V8 style BH? If not ill put the T56 I have in it?
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Old Aug 7, 2006 | 11:11 AM
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It will bolt right up; but the clutch gear splines won't engage a V8 clutch.

There's some clutch disc that people talk about that you can use to rig a 6-cyl transmission behind a V8. It's small, like an inch or more smaller than the right clutch, so it's weak.

THe 6-cyl transmission has the crappy wide-ratio 6-cyl gears; so you end up with the typical 6-cyl situation where EVERY shift is like the 1-2 shift int he 700 automatic. The motor goes from "scream" to "lug", with nothing in between. In other words, the ratios are too wide for a "performance" application; they're set up for a gas mileage application.

The 6-cyl transmission is also weaker than the V8 one, because the gear tooth part of the clutch gear is smaller in diameter.

The T-5 is already entirely weak enough: even the strongest V8 version is amazingly easy to tear up with a stock 305. While it's possible to make one live indefinitely by babying it sufficiently, I doubt that most of us here would go to all the trouble of a V8 swap, with the express intent of babying the car forever afterwards. We would probably like to equip the car in such a way that we could actually make use of the newly installed power.

Bottom line, just because it's "possible", doesn't make it "a good idea".

You need a V8 transmission, flywheel, and clutch, if you're expecting V8-like results.

Or, if you have a T-56, that's an even better way to go.
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Old Aug 7, 2006 | 01:37 PM
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From: Middle GA
Car: 1992 RS
Engine: Vortec Headed 383 9.6:1
Transmission: TKO600
Axle/Gears: 10 Bolt Posi 3.73
Go with the t56 you have, it is a much better transmission. I got 30miles out of my T5 behind the fresh 383. Was a waste of time and money. Should have just upgraded with the motor instead of trying to cut corners to save myself money on the short term.
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Old Aug 7, 2006 | 05:02 PM
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Thanks guys!
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