What's a top speed u can reach with 4.10 gears?
 

I have a 3500 4x4 ext cab 5 speed 12v dually just bumped my timing today to 18* my next step was gonna be 4k gov springs and 60lb vs is that gonna be a waste of time and money with having 4.10 gears?

if your tryin to set land speed records than yes i would change the rear gear other wise whats the problem?

4ks will make a HUGE difference. why do you want top speed?

I have 4 10s and hate um. plan to change them out pretty soon.the only good thing about um is pullin and u aint losing in town. Mine will hit about 85 on a good day.

I worded it a Lil wrong I didn't really mean like settin a new record top speed im jus kinda aimin to take use of the whole speedo u no lol like maybe 120? Ya about 85 is whAt I'm hittin on a good day. How much would it cost to swap for 3.55? An does anyone no a good place to get them?

Really?
 

Hope you find a good way to use all the brakes and steering with a lifted truck going that fast, too. :w2:

Glad I don't live in KY. Sounds like somebody's gonna get killed in or by the driver of a '96 12V there one of these days here pretty soon. :nope:

most cost effective rought is prolly gonna be find a good set of donor axles. changing the ring and pinion is expensive as hell. approx 5-$600 after parts and labor per axle. may get a better rate shopping around but its still gonna be salty. do you do much highway driving? 4.10's will yield better fuel economy in the city. be faster stop light to stop light and pull a tremendous amount better. the 3.54 are supeirior if you have an unlifted truck do a bunch of highway and use the taller gear. food for thought:humm:

Any kinda street racin is dangerous wether u r in something slammed to the ground or in something that is leveled out I jus want it there For wen my buddy's and I go to the track and run em down the strip? But for the most part most of my drivin is on back rds and a Lil city driven. So 4ks will be worth gettin even with the 4.10s?

4ks are the best initial upgrade for a 12 valve. night and day difference

Alright thanks that's what I have heard a lot I will probably get full cut dv's at the same time I get the 4ks I jus wanted to make sure I wasn't just wasting time and money on these things with having the gears I have