s197richie

I've got the 4.10s plus I went to a 40 series tire in the rear, from a factory 55 series so I'm shorter than 4.10 when it's all said and done. 80 mph is 2750 rpm, not too bad, not even with the o/rx and flo's...p.s. I'm MT...

mustangman02232

with a 5 speed i probably would of gone with even 4.30s, you will loose like 2-3 mpg depending on how you drive

your rear should read something like
3 31 LS or 3 55 LS

s197richie

if this is directed at me, actually I swapped to a 40 series DR off of a 55 series factory pirelli so all told I'm pretty close to 4.30 if not right at it.
...if not directed at me, nvm

p.s. with my current mods I still have quite a bit of gear left at the top of the track...maybe not enough for s/c but a decent nitrous shot at least...

Bmr4life

what about your auto guys. What are you highway rpms with 3.73s and 4.10s.

blackhorse05

my set up, saleen s/c 452 rwhp, 4.10 gears, never tached out, i wouldnt change it for the world.

Bmr4life

auto or manual?

wmtheflash

The gear ratios in the automatic are different from the manual. That means the RPM of an automatic with 3.73:1 is very close to a manual with 4.10:1. That's why everyone says 3.73 auto and 4.10 manual.

My car is somewhere around 2,500 rpm at highway speeds.

If you need any other information just use the search function.

Bluestar

+1, I revsomewhere between 2400 and 2500 @80MPH. When I had 4.10's, that number was close to 3000 rpm. Long trips on the highway is the reason I changed to 3.73's. I'm happy with them. (for now).

Bmr4life

One last question. Do gears void warranty or can the dealer not even tell they've been changed.