Guys who went to 35's . . .

[marin8703]

so what does that really mean, that i am starting with less gearing? In the t-case are the hi and low gears different from the base to the adventure or only the low? Thanks!

[Sewie]

Originally Posted by marin8703

so what does that really mean, that i am starting with less gearing? In the t-case are the hi and low gears different from the base to the adventure or only the low? Thanks!

Only the low range gear ratio is different. The only gearing difference for day-to-day driving would be between a manual and an auto.

[marin8703]

Originally Posted by Sewie

Only the low range gear ratio is different. The only gearing difference for day-to-day driving would be between a manual and an auto.

does anyone know if the pcmforless thing would calibrate the truck for 35s. The reason that i wopuld like this is because of my nav, it uses the VSS, is teh differnce between 33s and 35s gona throw it off. the nav is an aftermarket pioneer avic-z1.

i know this can be done my purchaseing a speed pulse generator from pioneer but its around 250, and it would be used only for the nav. are there any other options?

thanks.

[Desert Dan]

I Agree with Steve in San Jose

"Based on the way GM thoroughly engineered the H3, 32" or 33" inch tires are optimal, since a gearing change is not readily available."

Since we have an I-5, gearing is the only way to compensate for 35" tires. Off road in 4:1 low you might not notice it too much but on the highway?

35" tires are alot bigger than 33". If you change axle gears to 4:88 or lower the teeth on the gears get thinner (smaller) which are more likely to break and with bigger tires you are putting more leverage on half shafts, u-joints and front diffs.

Without changing anything and going to 35" tires your gas mileage will go down and acceleration will suffer. No ifs ands or buts!

[Sewie]

Originally Posted by Desert Dan

Without changing anything and going to 35" tires your gas mileage will go down and acceleration will suffer. No ifs ands or buts!

That is true, but it is not as drastic as some make it out to be.

I would think the hit to acceleration via the 35's would be significant, but not the gas mileage difference.