My front and rear axles are in need of a rebuild. Wheel bearings are shot and I think I managed to get water in them. So Iím on here posting yet another gear thread. Iím going to be spending $1431 to rebuild my axles and I want opinions and suggestions before I go through with it.
I have the 4.7 MPIF V8, 545RFE trans, 242HD TC.
I currently have 32Ē tires on my WJ with 80% tread, and I donít plan on buying a new set any time soon. When I do buy new tires, I plan on going to a 33Ē tire.
Here is what I have found out so far.
29Ē with 3.73 @ 75 = 2,171rpm (Stock)
32Ē with 3.73 @ 75 = 1,968rpm
32Ē with 4.10 @ 75 = 2,163rpm
32Ē with 4.56 @ 75 = 2,405rpm
33Ē with 4.10 @ 75 = 2,097rpm
33Ē with 4.56 @ 75 = 2,333rpm
I read allot that people say 3.73 to 4.10 is not worth it. I agree, but I take the freeway every day to work and donít like the idea of 2,400rpm. But then again I would love the quick get up and go I would get with the deeper gears. I plan on adding body armor, bumpers, roof rack, and the likes to it someday. So I would want the deeper gears for the added weight. But Iím still not too sure. I never tow anything, Donít go on long trips to often.
Right now Iím leaning towards the 4.56 gears. I just want some people to throw their opinions out there, as well as share their experiences. $1,431 is allot of money to me. I donít want to invest in something Iím not going to be happy with.
92 Cherokee - All nude and in need of some tlc!
95' Jeep Grand Cherokee Laredo, 148k, 5.2, NP242, 46RH, 4" RC lift, all new adjustable ca's(2 IRO front uppers and the rest RC adjustables), nitro shocks, JKS TB's, Jet Chip, Dynamax cat back, Magnaflow cat, GTP hood vents. 31" Pro Comps with Rock Krawler "D"s. Westin brush/grill guard with Hella 500s, 411's, Solid diff covers, detroit locker rear, power lock in front, SYE and Tom Wood's front/rear shafts, RE discos, BPE's, d-rings front and back, factory tc and rad skid, hitch, Sliders next.
03' Jeep Grand Cherokee Laredo, (wifes Jeep) 99k, 4.7 5 speed auto, K&N, KYB shocks, drilled-slotted rotors, All the toys.
2000' Ford Superduty, F250, 7.3, 198K, 37's, too much to list.
I like to go the speed limit at least (75). But from the looks of it I'm more and more likely going to go with the 4.56 and just stay in the slow lane :\
You should be fine tach'ing 2300-2500 on the highway. It's no different than someone who drives their stock jeep 80-85 mph on a regular basis. My XJ w/4.56's and 32's tach'ed 2800 on the highway for many years with no problems.
Personally, I'd go 33" with 4.56 gears. It's a good gear ratio with 33's for RPM's and fuel mileage. Plus it would even allow you to grow in tire size if wanted/needed. The old credo applies: "Do it once and do it right". But that's just my
Before you make a decision, this thead has some very interesting information in it about RPM's and tire size. Particularly those from Imped.