?Gear? ratio for 2010 GMC Sierra crew cab
In looking at a previous post, on the amount of weight a TV can tow, there was talk of the 5.3 L engine and ?? Gear ratio. We have a 2010 GMS Sierra crew cab, 5.3 L, but where do I look to see this "...
Forum Discussion
PA12DRVR wrote:
to wmoses
I changed my axle ratio on a 2002 (?) 2500 Suburban from 3.73 to 4.10. Made a noticable difference towing a circa 8,000# TT.
Hurt my unloaded gas mileage a bit, but since the primary purpose of the vehicle was a tow vehicle, it was a good tradeoff. I was close to out of warranty in any case, but asked the dealer about it and they told me they would not warranty the new gearing, but that the change would not void any other part of the powertrain.
i'm surprised it hurt your gas milage a bit... unless i'm missing connotation and you intend to mean a little bit and not quite a bit. we swaped the whole rear end in my mothers suburban which included the same gear change and she only lost 1-2 mpg... maybe the shift points in the tranny needed to be corrected?
i changed mine (3.55's to 4.10's) because of bigger tires (35's) and i was able to get pretty close to my stock mileage and my speedo is back to being accurate (comparing it to my gps)
Side note: changing gearing maybe the limiting factor of tow capacity but i'd be careful when assuming that you've increased it with a gear change.
