Axel gearing

[F16 Mech]

I’m thinking about installing 4:11 gears in my axels. I’ll have a stock transfer case, AX15 trans and 33 or 35” tires. I want to be comfortable going down the interstate at 75mph, but also want to keep it off road capable (nothing crazy but capable).

I’m sure there are others on here with a similar setup. I’d like to hear your opinions.

 

[Broncobowsher]

4.11 isn't enough gear.
What engine are you running?

 

[F16 Mech]

Original 302

 

[Broncobowsher]

I would gear for about 2200-2300 RPM @ 60 MPH. 2000 RPM absolute lowest if you are in a place where you can really take advantage of it.
About as low as the original 302 will be efficient and happy. You can't get away with lugging this stuff under heavy load like modern powertrains can do.

 

[phred]

I’m running 411 with 33’s and a built c4 and that’s just about right. With 35’s and the 5 speed I think you need at a minimum 456 and maybe 488. My 306 is quite happy spinning at 3000 (70mph) and I manage about 13-14 mpg on the highway.

 

[chuck1022]

I’m thinking about installing 4:11 gears in my axels. I’ll have a stock transfer case, AX15 trans and 33 or 35” tires. I want to be comfortable going down the interstate at 75mph, but also want to keep it off road capable (nothing crazy but capable).

I’m sure there are others on here with a similar setup. I’d like to hear your opinions.

4lo.com will let you put in all your variables so you can see the rpm...mph

 

[chuck1022]

Here

 

[Tricky Dick]

4lo.com will let you put in all your variables so you can see the rpm...mph

Grimmjeeper is my go to, it has most ratios pre loaded and you can compare 2 different setups side by side.

 

[broncozx]

do a search for gear ratio chart or diagram , then you will see tire sizes on the left and gear ratios on the top

 

[Tiko433]

4:56. 35s. Ax15. Im more then happy with that set up

 

[sprdv1]

I would gear for about 2200-2300 RPM @ 60 MPH. 2000 RPM absolute lowest if you are in a place where you can really take advantage of it.
About as low as the original 302 will be efficient and happy. You can't get away with lugging this stuff under heavy load like modern powertrains can do.

absolutely..

 

[ba123]

Grimmjeeper is my go to, it has most ratios pre loaded and you can compare 2 different setups side by side.

+1 for Grimmjeeper.

http://www.grimmjeeper.com/gears.html