Changing the gears in my suburban
I have decided to change the gears in my suburban (2008 5.3L 4sp auto), but not sure how much of a change to make. I currently have 3.73 gears, and was thinking 4.30 because 4.10 doesn't change much,...
Forum Discussion
Seems to me like a lot of investment for little payoff. I tried making mods to my half-ton Burb, and in the end I decided to upgrade to a 2500. THAT was the best choice I ever made, not re-gearing my half-ton.
My '01 Burb had the 4L60 and 4.10 gears. I always towed in third, and the engine was around 3200 RPM at 65 MPH. I towed down to Florida, and out to the Rockies over the Continental Divide. Engine didn't have enough power/torque to hold speed in O/D, plus I didn't want to overstress the transmission. Third is a 1:1 ratio, so the tranny was just passing the power through. Regearing to a 4.30 would provide negligible increase in power, but increase your RPMs.
And also, you still have that weak 9.5" semifloater rear, which, IMHO, is the weakest part of the powertrain. If you're towing something approaching 6,000-7,000 lbs, an upgrade to a 2500 would be your best bet.
Just my $.02.
My '01 Burb had the 4L60 and 4.10 gears. I always towed in third, and the engine was around 3200 RPM at 65 MPH. I towed down to Florida, and out to the Rockies over the Continental Divide. Engine didn't have enough power/torque to hold speed in O/D, plus I didn't want to overstress the transmission. Third is a 1:1 ratio, so the tranny was just passing the power through. Regearing to a 4.30 would provide negligible increase in power, but increase your RPMs.
And also, you still have that weak 9.5" semifloater rear, which, IMHO, is the weakest part of the powertrain. If you're towing something approaching 6,000-7,000 lbs, an upgrade to a 2500 would be your best bet.
Just my $.02.
