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#3
03-31-2010, 05:31 PM
Hummer Expert
Join Date: Sep 2007
Location: Mason, OH
Posts: 779
Re: which gears? 4.56's or 4.88's?
At 2000 rpms I am running at 68mph on GPS and 65mph on the speedo with 37" Toyo Open Country M/T's on flat ground.
on uphill I am at 2400 rpms at 68mph on gps.
Last edited by HumminNBoatin' : 04-01-2010 at 05:18 PM.
#4
03-31-2010, 11:42 PM
Hummer Professional
Join Date: Jan 2004
Location: Socal
Posts: 272
Re: which gears? 4.56's or 4.88's?
It shows 68 mph on the speedo, but with GPS mine shows 63 mph.
I thought the point of gears was for the car run at lower rpm at higher speeds? There isnt much of a difference in my mpg...
Last edited by kalantar : 03-31-2010 at 11:44 PM.
#5
04-07-2010, 05:16 PM
Hummer Professional
Join Date: Sep 2008
Location: Utah
Posts: 293
Re: which gears? 4.56's or 4.88's?
I would go the 4.88's for sure. You will regret going the other way if you do because it just won't run the way you would want it to, or the way you would think it would... I did mine just this past December and I also am running 37.5 Toyo MT's, I love it, it runs great. I am also running a Superchips Cortex, which really helps too, it is sharp now. The only downfall is that when you get up to 70-75 MPH, you start to have some issues with it wanting to downshift to 3rd due to lack of power, especially if you are traveling on a road that is not completely flat (slight incline). I am still trying to figure out what to do to get the power back without going the expensive route. Next on the drawing board is intake and exhaust.
__________________
Sweet looking H2 with not enough mods (2003 Pewter H2, 20" Rockstars, 40"x15.5" Toyo MT's, E&G Extended Flares, Full body tube steel exoskeleton, 5" Skyjacker lift, Amp Research steps, Gobi Roofrack and ladders, Smoked LED's, AFe CAI, Dynatech long tubes and cats, Magnaflow exhaust, Stock tune, 4.88 gears, Chrome Grenade Shifter, interior blacked out, rear captains chairs, Solar Power!!)
#6
04-25-2010, 04:38 AM
Hummer Professional
Join Date: Jan 2004
Location: Socal
Posts: 272
Re: which gears? 4.56's or 4.88's?
Bump on this thread, what did you decide to do?
Even though the 4:56 gears didnt improve my mpg, I do have to admit it drives better now.. I can hit 100 mph no problem and just seems to shift/drive much better...
Would 4:88s do even better?
#7
04-26-2010, 08:10 PM
Hummer Expert
Join Date: Mar 2009
Location: Burnsville, MN
Posts: 657
Re: which gears? 4.56's or 4.88's?
well i think i have decided on the 4.88's... just @ $1800 for parts and labor is the problem.
most places want to buy the parts for me so i can get the warranty. which makes sense...
sucks i can buy all the parts for about $700ish....i just dont know how to install them.. labor is a bitch!
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