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#1
01-26-2014, 12:38 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Overdrive?
Im not a trans tech, never work on them. Not sure what can be done in those regards. later model transmissions will have different control modules so not likely feasible to do a swap like that. Find a good transmission tech and he should have some ideas.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#2
01-26-2014, 12:45 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Overdrive?
In the 4 speed over drive range is .696:1 compared to the 6 speed in a 2008 H2, 6th gear ratio is .667:1 so you wouldn't gain much with that swap anyway as for as on overdrive gear goes.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#3
01-26-2014, 12:46 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Overdrive?
1st Gear Ratio
4.027
2nd Gear Ratio
2.364
3rd Gear Ratio
1.532
4th Gear Ratio
1.152
5th Gear Ratio
0.852
6th Gear Ratio
0.667
Reverse
3.064
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#4
01-26-2014, 12:47 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Overdrive?
1st Gear Ratio
3.059:1
2nd Gear Ratio
1.625:1
3rd Gear Ratio
1.000:1
4th Gear Ratio
0.696:1
Reverse
2.294:1
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#5
01-29-2014, 08:18 PM
Hummer Veteran
Join Date: Nov 2011
Posts: 163
Re: Overdrive?
Your transmission has 4 forward gears and a torque lockup. A lot of people mistake this for a gear when watching the tach. You'll see the RPM's drop when it kicks in.
Last edited by glennf1 : 01-29-2014 at 08:23 PM.
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