Results 1 to 8 of 8

Need HELP!! Manual 5speed to LS1 M6 Tranny Swap

This is a discussion on Need HELP!! Manual 5speed to LS1 M6 Tranny Swap within the Manual Transmission forums, part of the Drivetrain category; I have a 2004 Chevy Joe Gibbs Silverado. It is the 4.8L supercharged with the stock gm 5speed tranny. I ...

  1. #1
    blown_n_on_fire
    Guest

    Need HELP!! Manual 5speed to LS1 M6 Tranny Swap

    I have a 2004 Chevy Joe Gibbs Silverado. It is the 4.8L supercharged with the stock gm 5speed tranny. I am wanting to put a LS1 M6 tranny it and change my ring and pinion from a 3.73 to a 4.10. I am wondering if anyone could tell me the gear ratios of all 6 gears in the M6. I also was wondering if anyone knew if an M6 would bolt up to the 4.8L or if It is even gonna be worth my while to do this modification to my truck??? I just always hear LS1 guys saying the Gibbs trucks would be way bad if they had a M6 6 speed instead of a 5 speed. Any help anyone could give me would be greatly appreciated. Any ideas on more speed and power mods for the Gibbs trucks??? I am having trouble finding underdrive pulleys and stuff too??

  2. #2
    SUPREME member-oderator oneBADDz's Avatar
    Join Date
    Nov 2005
    Location
    Lost in Texas
    Age
    34
    Posts
    2,683

    Custom Slate Blue
    99 B4C

    First 2.97:1
    Second 2.07:1
    Third 1.43:1
    Forth 1.00:1
    Fifth 0.80:1
    Sixth 0.62:1
    Reverse 3.28:1

  3. #3
    SUPREME member-oderator oneBADDz's Avatar
    Join Date
    Nov 2005
    Location
    Lost in Texas
    Age
    34
    Posts
    2,683

    Custom Slate Blue
    99 B4C

    Oh yeah, it'll bolt up

  4. #4
    SUPREME member-oderator oneBADDz's Avatar
    Join Date
    Nov 2005
    Location
    Lost in Texas
    Age
    34
    Posts
    2,683

    Custom Slate Blue
    99 B4C

    Actually, I gave you the wrong numbers, those are 93 t56 only, here's 94-02
    2.66:1 first
    1.78:1 second
    1.30:1 third
    1.00:1 fourth
    .74:1 fifth
    .50:1 sixth
    3.28:1 reverse

  5. #5
    SUPREME member-oderator oneBADDz's Avatar
    Join Date
    Nov 2005
    Location
    Lost in Texas
    Age
    34
    Posts
    2,683

    Custom Slate Blue
    99 B4C

    For proper fitment you really need to get one from 98-02, there are slight housing differences

  6. #6
    blown_n_on_fire
    Guest
    Hey man thanx for the #'s... Do you think this would be a worth while mod for my truck? thanx again

  7. #7
    SUPREME member-oderator oneBADDz's Avatar
    Join Date
    Nov 2005
    Location
    Lost in Texas
    Age
    34
    Posts
    2,683

    Custom Slate Blue
    99 B4C

    Oh yeah it would, not only would you have lower gears for off the line, you get an extra overdrive. Do we even need to mention the cool factor? It's a win win

  8. #8
    Member
    Join Date
    Aug 2005
    Location
    metro Detroit area
    Posts
    300
    BTW The first ratios are GTO ratios too and would also work if you want them.Minor conversion but basicly the same install as an LS1 T56.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: Stuck Manual Tranny
    By fish in forum Manual Transmission
    Replies: 7
    Last Post: 04-29-2009, 06:08 PM
  2. Will tranny swap fail smog in CA? Auto to manual?
    By doctorleevil in forum Drivetrain
    Replies: 0
    Last Post: 09-01-2007, 04:09 PM
  3. Please Help...asap Manual Tranny
    By 9secondsflat in forum Corvette
    Replies: 2
    Last Post: 01-09-2006, 04:33 PM

Members who have read this thread: 0

There are no members to list at the moment.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •