My truck has a 4L60e, 5.3 w/LS1 Hot Cam, 3000 stall, 275/60/17s on the rear, and 3.73s. I drive the truck on road trips and dragrace it often. I was gonna install 4.10s but what about 4.56s? what would be the RPM in 4th at 70 mph? How much would the speedo be off untill I tune it? I would just like some insight. Thanks.

 

That truck looks familiar. Where you from?

I have 4.56s in my truck with 275/60-17. I love em. About 2450 going down the highway at 65, 70 is a little over 2500 i believe.

 

I'm from El Paso TX. but now I'm in Fayetteville NC

 

i also have 4:56's, there perfect for me pushing heavy 22's

 

you can always go in the middle with some 4.30 gears. i have no clue what the rpm is at going 70mph though.

 

With 30in tires @70 I push around 2650 rpm.

 

u really gunning for that guy hard huh otter? lol i love it! Try out the fbody gear calculator. Its the same trans just enter in a ratio and tire size and see what u like. arturo put me on to that one

 

i have a 5.3 with ls6 cam, about to replace it with comp cam 218/224, tb stall on 285/50/20s oem rims, with 456s i turn about 2400ish rpm at 70

 

Sup with the 4.10s in your truck?

 

What would the RPM be at the end of the 1/4 in 3rd gear?