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Tranny gear swap... can it be done?

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Old 08-21-2005, 10:00 PM
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Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
Tranny gear swap... can it be done?

Well, im curious.. I want a 1986 L-69-HO T-5 with the following gears:
1st - 3.35
2nd - 1.93
3rd - 1.29
4th - 1.00
5th - .61

Now, I know that this would be hard transmission to find... But i have a 1987 T-5 that was mated to an LB8:
1st - 4.03
2nd - 2.73
3rd - 1.50
4th - 1.00
5th - .76

Would i be able to buy the gears (or all the guts, if need be) somewhere and replace them all? If i put a T-5 in there i would need to have it rebuilt to hold a lot more power anyway.. and if that is possible.. is there a way for me to get an even lower overdrive gear? I have been toying with the idea of getting a T-56 but pretty much only because of the .56 6th gear.. but if I can have .61 thats fine (or even lower, if possible)..

So, what do you guys think? Can I (hehe, a shop, more than likely, dont know if I wanna screw around with a transmission - never have) do this? And if I can, are there other gear sizes available to me (aftermarket) that I could chose to use besides what came in any stock T-5 (just curious)?

Thanx guys
Old 08-22-2005, 11:22 AM
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Car: Building LS3, T56 Z28
Engine: LS3
Transmission: T-56
Axle/Gears: Moser/ 4.11
TKO trannies can do whatever you want. The guy that rund the buisness is allways on these boards. seach and you will find him.
Old 08-22-2005, 02:23 PM
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meh..
$1800 for a TKO? If that was the case, then i would just go with a T-56, spend an extra few hundred.

I just figured the T-5 would be a LOT cheaper in the long run to go with, but if it isn't, then to hell with that
Old 08-22-2005, 04:00 PM
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Car: Building LS3, T56 Z28
Engine: LS3
Transmission: T-56
Axle/Gears: Moser/ 4.11
Thats exactly why I am gonna go with the Aftermarket Tremeck that spohn sells.
Old 08-22-2005, 07:59 PM
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Car: 1987 Iroc-Z
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Transmission: 700r4 w/ about 7500 miles on rebuild
thats not what i was hoping for! hehe
oh well, i guess i will look into i soon.. maybe i can make it a project and rebuild it myself... does anyone know where I can buy T-5 gears?
Old 08-22-2005, 08:15 PM
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If you want to make it a project, I got a really good advice from this board.

Find a T56 that has problems like popping out of gear. Most people want to buy a tranny and bolt it in, so they wouldn't pay nearly as much for the one that has any kind of wear. I got my T56 for $600 (+70 shipping). All rebuild stuff from D&D performance costed ~$450. Tools (shop press, dial indicator...) $200, and I also used the tools to do my rear end, so that's not just the tranny cost.

In the end for just over a grand I have a tranny which is fully reconditioned and restored. I changed all bearings, synchro rings and other wearables. Plus it was a really cool project.
Old 08-23-2005, 12:28 AM
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Car: 1987 Iroc-Z
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Transmission: 700r4 w/ about 7500 miles on rebuild
do you know any other places that would sell replacement T-5 parts? stock replacement or strengthened?
Old 08-23-2005, 09:01 AM
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Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00
The biggest problem is that the gear ratios you want are only available in stock gears, which are going to torque limit the trans to about 275 lbs/ft. These ratios were only offered in NWC T5s, which are not exactly known for their strength.

The WC T5s, which have an official torque rating of 300 lbs/ft. are only available in 2.95/1.94/1.34/1.00 ratios. You have some options with a WC T5 though. Superalloy gears are avialable that will increase torque capacity to about 400 lbs/ft. G-Force gearsets are avilable that can take the T5 all the way up to 500+ lbs/ft with the upgraded mainshafts. Send me a PM if you want more info.
Old 08-23-2005, 12:46 PM
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Car: 1987 Iroc-Z
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i guess its a save up for a t-56 then... I want something that can take whatever I will throw at it (power-wise.. i dont beat on my car) and have a great overdrive gear.... and is cost efficient
Old 08-23-2005, 12:50 PM
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Car: 91 GTA and 85 IROC
Engine: 355
Transmission: gear jammer
Axle/Gears: 4.11
cost efficient and power don't go in the same sentance.
Old 08-23-2005, 01:39 PM
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Car: Building LS3, T56 Z28
Engine: LS3
Transmission: T-56
Axle/Gears: Moser/ 4.11
you can say that again, hehe
Old 08-23-2005, 01:43 PM
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Car: 1987 Iroc-Z
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Transmission: 700r4 w/ about 7500 miles on rebuild
hehe true, true... just, if i can get a T-56 setup (that can hold 450ft-lbs) for $2200-$2500 with a .56 overdrive gear.. or a built T-5 for near all those numbers (but the overdrive gear either wont be quite as good or wont be as good at all) then i will prolly go with the T-56...
Old 08-23-2005, 01:47 PM
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Car: 1987 Iroc-Z
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Transmission: 700r4 w/ about 7500 miles on rebuild
nm, the 94-97 T-56 had a .50 overdrive gear.. even better
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