thats it a multibillion dollar company that uses the same chart that all other jeep supply house go by has to be wrong ill call them right now. hang on ill be right back

 

4.56 is pretty much what i recomend to customers with 33's and an aw4

 

they use a 1.1 final drive, which wont be right with anything with OD or a 5th gear.

there chart is setup to work with 4speed manuals or 3 speed autos, and they just use a generic 1.1 as there guideline

 

Yep, that is why I do my own math. It is easy and it is correct.

 

i called them they said your right there going to change all the charts tomorrow but for me im staying with what works for years tried and trued method

 

You are wrong!! Get over it. I've been doing this for a couple of years and I know how to do simple math. None of those charts are for your transmission, so none of those charts will have the right gear ratio for your overdrive. Also if your tires are say 37.5 not the advertised 38 that will make a difference.

 

couple of years come back in thirty years then you will have a point get over youself .

 

but the fact is the numbers arent right.

 

i have proof mine is almost dead on for the chart like 200 rpm different

 

I didn't realize there were 2 threads arguing about the same thing.

 

for 38s with 411 at 65 it call 2360 prm im running 410 and about 2000 rpm

 

Bull, you are wrong so get over it! No you are running 65 at about 1850rpms. If you can't see the line for the 2000 mark get some glasses.

 

in you little shelted world of numbers you live in your right in the world of true facts its 1950 rpm i live in the world of fact and the fact is 1950 rpm 410 gears on 38s .

 

But your math is off 400 rpms from what you say you run at

And how do you know your speedo is right

 

it states on the chart rpms will vary