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

Converting a t-5 to a 4th gen 6 speed

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Old Jun 13, 2001 | 09:56 PM
  #1  
91maro's Avatar
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From: Burlington, N.C., USA
Converting a t-5 to a 4th gen 6 speed

I want to convert my 91 t-5 to a 6 speed. can it be done and what all do i need to do it right.
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Old Jun 13, 2001 | 11:17 PM
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JPrevost's Avatar
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Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
Check out the tech articles. You'll want to be careful which 4th gen setup you get. The LT1's will work but the LS1's use a different cluch (pull/push, I forget).

------------------
, Jon (350 TBI!)
91 Red My website
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Old Jun 14, 2001 | 02:16 AM
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Kevin91Z's Avatar
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
There is a tech article on this site that tells you how to do it. Here's the link directly to it:

http://www.skulte.com/T56.html

Also search this board, several other people have done the swap and posted about it. For cost, expect to spend $1500 for the trans and related parts, and more for installation.

------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

[This message has been edited by Kevin91Z (edited June 14, 2001).]
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Old Jun 14, 2001 | 08:09 AM
  #4  
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From: Stuart, Florida USA
Get a T-56 from a 94-97 4th gen. Make sure you get everything from the flywheel back. Also, make sure you get the clutch slave cylinder. It is different from the T-5 slave, but bolts right in. Order a crossmember from Skulte. Except for having to removed about 2 inches of the floor pan, behind the T-5 shifter hole, it is then a bolt in project. You can reuse your trans mount, but I bought an urethane one. You can also use you driveshaft, but I did switch the front yoke to the 6 speed one, for more slpine engagement. All in all, it can be done in a day very easily.

------------------
1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP
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Old Jun 15, 2001 | 04:54 PM
  #5  
kevinc's Avatar
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Car: 1982 Z28
Engine: LS1
Transmission: T56
You, uh, didn't mention the VSS issue. The T56 uses a 40-pole reluctor to generate VSS output...early third-gens need a cable-drive, late third-gens need a 4,000 pulse/mile VSS input.

For early thirdgens, you either can spend $350 to have JTR convert your T56 tailhousing to mechanical drive; or you can spend $75 buying either Cyberdyne or Dakota Digital boxes and swap to an electronic speedo.

For late thirdgens, it's just the $75 brain box and some rewiring.

------------------
1982 Z-28

See http://www.mycar.net/mafb/registry/detail.cfm?id=276 for details
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