mongosmashmode7

I have a 5.0 Screw with a 6" Fabtech lift and 35" tires. I know that will directly effect downshifting especially with the 3.31 gearing. What I want to ask is when I am at high speeds (70-85mph), will the amount of down shifting to 4th and 5th gears that is happening burn up the transmission? I have not pulled a load yet. This is just normal highway driving. Should I be worried about pulling up to 5K lbs? I will never pull more than that.

zx12-iowa

Shouldn't wear it out materially faster. Just may be annoying to some plus significant overall power loss. 5.0 needs to rev a bit for power so 3.31 gears plus bigger tires slows it quite a bit. If you are worried regearing will help a lot.

But the shifting won't hurt the truck. If you tow heavy it could add some strain though.

130428

if it's bad you might want to lock out 6th as a start...
then a re-gear might be something to look into...

AbitaPro

OP - did you correct your speedometer for the change in tire size? If not that may help?

BoozeDaily

iTrader: (2)

Adjusting my speedometer after lift and tires helped out my shifting in my truck with 3.31s between the 45-60MPH range.