i'm about to put some factory 20's on my 05 cc and currently have 3.90 gears. i'm also about to put in a true trac and was thinking about some different gears, maybe 4.10. Any suggestions?

 

You probably won't feel much difference if at all going from 3.90s to 4.10s. Try 4.30s

 

I run a 4.10 with 29" tires, if I was running 20's with stockish height tires I would run 4.30's.

 

4.56s with 33s.

 

Ill be running 4.30's before to long

 

4:10s with 275/55/20s

 

4.10s with heavy 22's_30.5 in tires overall. i think its the perfect gear for a dd heavy crew cab. if u have 3.90s already and want more gear go 4.30s cause i dont think u would notice much on the 10s

 

How are 4.30's do for a dd? how much will i lose up top going to 4.30's?

 

You will probably gain up top (up to a certain point). I'd say up t0 115 it will pull better, you'll get in the power a lil quicker. Your effective ratio with 4.30's and 20's will be about like mine is with 4.10's and 29" tires on 17's. I turn about 2100-2200 at 60 mph. It does great for dd

 

4.10's on 08 ccsb 4.8. 305/30/zr26. "33.20" overal diameter. Perfect gear setup.