new gears for bigger tires?
 

hey guys, when my truck gets paint on it and i put my new 37" tires on it, would i be smart to upgrade to a set of 4:10 gears from my 3:55's? i think i would be better off with the 4:10s

With a gasser truck I would tell you to go for 4.56 in a heartbeat, but with the diesel, 4.10s would work with 37s. It would be a tad flat-footed with 3.54s. Our Cummins like the low rpms, but if you can't even get into OD until 70, that ends up not working out very well.

Here's a table of tire sizes and gear ratios with RPMs in 3. Take about 25% off the RPM for OD. You may have to increase the zoom of your screen to read it well.

Attachment 47942

4.10s would work well

I think you should keep the 3.54's

37's would suck with 3.54 gears.

I know 3.54's and 35's work well. I really don't like 4.10's on a street truck

4.10s might be good, kinda depends what your doing with it. high gears and big tires are nice rollin down the freeway but suck if your towing a lot or tryin to get rollin fast with a stick.

I will agree with the 3.54's and 37's being no fun to tow with ... and prob a good deal of broken parts to go along with it. Course if you are gonna do a good deal of heavy towing why would you put 37's on the truck?

i have 4.10's and 35's. works great on the freeway but around town kind of sucks. im leanining towards 4.56's when i go to 37's. no way i would ever do 3.55's on 37's

do the 4.10s bro. we already had this conversation dan. :ouch: