I've spent the day reading up on ratios and checking out the gearing calculators and my eyes are crossed. I was running 31" BFGs with my 3.73 Dana 44 (2005 LJ) as a DD and was pretty happy with the performance on the interstate and dirt roads. When it was time to change the tires I got some wild hair up my butt and went to a 32" BFG and dang, I didn't expect such a degraded performance.
Instead of selling my brand new 32s" and going back to 31s" I'm now considering a gear change. The calculators are telling me a 3.93 or 4.10 would put me back about where I was. Then I called the local Fortec Jeep shop and the guy is trying to sell me on jumping to 4.56 gears. :confused:
But it looks like I'll be running over 3000 RPS at 70mph+ which is where this jeep spends most of its time running back and forth to the hunting club.
I know I won't see a big jump in performance with a 4.10 change but I don't really want a BIG jump. I just want to be able to use my OD on the interstate and drive the dirt roads at my hunting club. I do (or did) pull a 2000lb boat with my old combination (31s" and 3.73) just fine and I think a 4.10 would work as well.
I'm never going to put 33s on this Jeep and I'm afraid that if I go to 4.56, I'll never be able to go back down to a 31" tire.
Is there an option between 4.10 and 4.56? I've seen mention of a 4.27 but then also said where it won't work with my Dana 44.
Should I push back on the Jeep shop and tell them to give me the 4.10s?
Will a 4.56 ratio run my engine too hard at 75mph? (over 3100rpm)?
Is there a middle ground for me here or do I bite the bullet and sell my new tires and go back to the 31s" I loved?
Instead of selling my brand new 32s" and going back to 31s" I'm now considering a gear change. The calculators are telling me a 3.93 or 4.10 would put me back about where I was. Then I called the local Fortec Jeep shop and the guy is trying to sell me on jumping to 4.56 gears. :confused:
But it looks like I'll be running over 3000 RPS at 70mph+ which is where this jeep spends most of its time running back and forth to the hunting club.
I know I won't see a big jump in performance with a 4.10 change but I don't really want a BIG jump. I just want to be able to use my OD on the interstate and drive the dirt roads at my hunting club. I do (or did) pull a 2000lb boat with my old combination (31s" and 3.73) just fine and I think a 4.10 would work as well.
I'm never going to put 33s on this Jeep and I'm afraid that if I go to 4.56, I'll never be able to go back down to a 31" tire.
Is there an option between 4.10 and 4.56? I've seen mention of a 4.27 but then also said where it won't work with my Dana 44.
Should I push back on the Jeep shop and tell them to give me the 4.10s?
Will a 4.56 ratio run my engine too hard at 75mph? (over 3100rpm)?
Is there a middle ground for me here or do I bite the bullet and sell my new tires and go back to the 31s" I loved?
32" Tires w/ a 42RLE what axle gearing?
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