C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

5-speed conversion

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Old Mar 19, 2002 | 08:43 AM
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Default 5-speed conversion

I have an '85 vette with the 4+3 manual transmission, I would like to swap in a 5-speed. has anyone out there done this or know of somebody who has successfully done it? Any info would help. thank you Greg
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Old Mar 19, 2002 | 09:45 AM
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Default Re: 5-speed conversion (atotalnincompoop)

If you're going to go through all the work, why not do a T56 or ZF6 instead of a 5-speed?
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Old Mar 19, 2002 | 09:53 AM
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Default Re: 5-speed conversion (atotalnincompoop)

Richmond Gear makes a Six Speed conversion kit for the 84-88's.

The ZF is do-able too, just probably end up being more $$$ unless you find a good used unit.

The Richmond 5 speed would probably work too, but I think the gearing isn't really what you'd want (5th gear isn't overdrive, it's 1:1)
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Old Mar 20, 2002 | 05:24 PM
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Default Re: 5-speed conversion (Jim85IROC)

I'm on a budget, a very tight budget, and I can get a 5-speed out of a 5.7 tpi iroc for free off of a friend, so I'm trying to work with it. thanks:)
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Old Mar 20, 2002 | 05:29 PM
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Default Re: 5-speed conversion (atotalnincompoop)

I'm on a budget, a very tight budget, and I can get a 5-speed out of a 5.7 tpi iroc for free off of a friend, so I'm trying to work with it. thanks:)
5.7 f-bodies never came with a 5-speed. It's either not stock, or he's got a 305. But either way, a T5 won't last long behind a strong 350. It's a very weak transmission. If it's a non world-class unit (pre 88), then it's a REAL weak trans.
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Old Mar 20, 2002 | 08:29 PM
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Default Re: 5-speed conversion (Jim85IROC)

this is what you want http://www.fortesparts.com/tremec/tr3550-2.html

very strong, OD 5th and it has the vette tail shaft. The t-5's weakest part is 5th, be careful with it and it will last a while, i've seen them in 2nd gen fbodies behind 350-400hp motors.
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Old Mar 21, 2002 | 05:07 PM
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Default Re: 5-speed conversion (nsimmons)

the unit that is available to me is from a '89 z-28, it's a t-5, and it's FREE so I want to make it work. does anyone know about the shifter location and what about the driveshaft beam, how can I make this work?
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Old Mar 21, 2002 | 05:15 PM
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Default Re: 5-speed conversion (atotalnincompoop)

There is a local guy here in VA that has an 84 with a T-5 from an IROC in it. His car was an auto before and he got a hurst short throw shifter for it. Just reused the auto console plate and the shift patteren was tight enough to fit in that slot. He pulled the leather boot up to the shift **** and you can't even tell its in there.

As for the C beam support brace he fabricated a bracket to bolt on to the tail shaft and rigged it up. He loves it, I have seen the car and it looks nice. So it can be done. He was in the same boat, wanted a stick on a budget.
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