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Thread: All 88-97 T-56 Trucks Check in

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  1. #1
    Join Date
    Oct 2003
    Posts
    14
    I am about to do a T-56 swap into my Suburban and I just need to know what everyone is doing for a crossmember. Chris Alston's Chassisworks sells tubular crossmembers in 2,4,6 and 8 inch drops for $97. I know that the t-56 needs a crossmember with a drop in it, but how much? I am thinking 4 inch, but I might be wrong. What are you using? Any help would be great. I picked up a clutch pedal and master cylinder today and I am going to fit it in tomorrow. Also what kind of clutches are you using? And do you ever tow? If you do, what is the max weight you have towed. I want a clutch that is pretty streetable, but durable and can handle the weight of the Suburban.

    Thanks in advance

    David.

    PS. Also Summit sells a universal crossmember with a 3 inch drop found here Universal 3" Drop Transmission Mount
    David Scott
    1997 Suburban
    T56 swap DONE!

  2. #2
    Join Date
    Jun 2003
    Location
    North Central Arkansas, Cave City
    Posts
    279
    My truck is a little newer than what you was looking for but I would think that if you got a crossmember from a 5 speed truck from 88 to 98 it should work. My truck had a 5 speed and the 6 speed worked perfect with that crossmember. It is flat with no drop in it. I am using a spec II clutch and it works very smooth. Be prepared to go to at least a 4.10 gear with that trans because low gear is 2.66 and 6th is .50, and if you plan on pulling much think hard about 4.56's. I can run 85 @ 2000rpm's with 4.10's and a 29" tire in 6th gear.
    http://img.photobucket.com/albums/v6...nstruckls1.jpg

    05 Joe Gibbs RCSB 5 gear
    99 Vette / 6 gear
    02 Honda Goldwing
    00 Hayabusa

  3. #3
    Join Date
    Oct 2003
    Posts
    14
    So I guess Ron is the only person on this board with a 6 speed in his truck? WOW I thought more people had done this swap.
    David Scott
    1997 Suburban
    T56 swap DONE!

  4. #4
    Join Date
    Jun 2003
    Location
    North Central Arkansas, Cave City
    Posts
    279
    You might have better luck on the LS1 Tech forum with six speed swaps. www.ls1tech.com
    http://img.photobucket.com/albums/v6...nstruckls1.jpg

    05 Joe Gibbs RCSB 5 gear
    99 Vette / 6 gear
    02 Honda Goldwing
    00 Hayabusa

  5. #5
    Join Date
    Mar 2003
    Location
    Florida
    Posts
    1,208
    mines a 98 and the tranny sits on the factory x-member.
    as for a clutch, spec stage 2 at least, and like ron said...be prepared to re-gear.
    Hugger Orange 99 SS Hardtop #756
    485rwhp/440rwtq SAE

    http://i83.photobucket.com/albums/j301/slmdls1/Signatures/hugger-prostar-sig.jpg

  6. #6
    Join Date
    Oct 2003
    Posts
    14
    Thanks for your responses guys. I found tons of usefull info over at ls1tech. I will be doing the swap within 2 weeks. Also I have decided to go with 4.56 gears. I want to be able to get off the line with out smoking the clutch. I got the pedal and master cylinder installed last night, came out great. Looks like it came from the factory like that. More updates to come.
    David Scott
    1997 Suburban
    T56 swap DONE!

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