Yes, we went with the 72” and big bell RCV with 5.38 gears. Originally we were going to do 5.13’s, yet we decided to change and go with lower gears because of the tire & rim size. 42x13.5X20 on Trail Ready bead-locks with the World Series bead-rings.Did you get the 72” Dynatracs?
I called and talked to them about it. They are working on a diesel spect kit but said it’s challenging them to say the least. They hope to have it out this summer.
Just for reference, as I know it is a different setup, my 1500 4x4 diesel turns 2,000 RPM at 72mph. This is with the 3.92 gears and 33x12.5x22 on the stock heavy ass 22's. At 75mph, it gets 24-25mpg. So, the diesel can still get good mpg turning more RPM.Stock I was doing 76 MPH in 8th gear at 2,000 RPM
Now I’m doing 69-70 MPH in 8th gear at 2,000 RPM
I’m going to try putting a little more PSI in the tires. At 27 cold I am getting about 12-13 mpg city driving. Which is what’s killing my overall mpg. Highway isn’t too bad and I can probably average around 20 maybe. Haven’t done a trip long enough to test it out yet though.Just for reference, as I know it is a different setup, my 1500 4x4 diesel turns 2,000 RPM at 72mph. This is with the 3.92 gears and 33x12.5x22 on the stock heavy ass 22's. At 75mph, it gets 24-25mpg. So, the diesel can still get good mpg turning more RPM.
Good info on the 4.88's, I would have done the same. I'm also waiting for the PSC kit, stuck in limbo. Steering in these jeeps are barely adequate in stock form.
You should definitely get the 72” wide ones. I wish I had gotten those instead of the 69.5” Dana Ultimate 60’s I ended up getting.I have the 3.0 diesel. Looking to run a 39” KM3 on front and rear Dynatrac 60’s.
im curious what you have that I don't that is killing your mpg so much. I mean I know I have 37's and you have 40's but I have stock gears and I've added lots of weight including heavy ass rims and im averaging (hand calc) 24.5 and I just did a 760 mile trip mostly all hills, and mostly uphill and my hand calc with the 2 tanks it took was 24.9 going 72mph. that's badass and way better than any gasser I've ever seen in a jeep. note: I also had 350 pounds give or take in the backseat/cargo area of metal. not including me and passengers (310 pounds)
Look at @Howardlv22 post above. He’s on 36.8” tires and stock 3.73 gears and getting almost 25 MPG highway.Just can’t wrap my mind around 4.10’s and a 39.
Dynatrac doesn’t show a ratio below 4.88 but I’m sure arrangements can be made. I was leaning towards 4.56.
All on hold till PSC gets the steering kit ready, that’s my next step.