Ok so I just got my transmission rebuilt to a heavy duty setup and I also redid my rear-end and went from 3.55 to 4.56 gears. The RPM's have risen slightly and I was wondering what everyone was running as far as gears and tires. What are your RPM's at around 70mph.

 

Did you get your speedo re-calibrated?

You changed gears DRASTICALLY, so your shift points, and speedometer are BOTH off.

So are the miles you put on the truck


EDIT: pretty much everything that has to do with the speedo is off..

Gas mileage,speedo,shift points


your rpms are right, just have nothing to do with anything else, just redline..lol

 

Yeah what leo said. With your gears and tires both different, everything is gonna be all fubar.

 

they are right but...

32s, 4.10s, auto, 2400rpm @ 70.

 

i know with what zach said at 90 mph 3000 rpm

 

Sorry guys forgot to mention I had the comp flashed the same day it came out of the shop...all readings are right as rain.

 

get that body lift on yet?

 

225/45/17, 5-speed, 5,125rpm @ 180.

 

^^^ shut up.

 

33s, 4.10s, 5 speed manual, not calibrated. On the speed limiter (92-93mph) my buddy paces me and says its about 100-102mph and I am @ 3200 rpm...

 

stock 235/75-15 tires, 4.10's, 5speed manual, 2800 RPM at 70mph (too high)

 

245/75/16 tires with 4.10 and I turn about 2450ish at 70.

 

Ok thats great. The little increase I got isn't so bad at all, just that its noticable. I was just trying to get an idea at what I should be close too. Thanks guys