jeepman 87 Posted April 19, 2014 Share Posted April 19, 2014 I have an 89 mj with an 8 inch lift and 35's. I'm looking at gears but I want to drive on road but also have fun on trails and mud. What size gears should i use Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 19, 2014 Share Posted April 19, 2014 4.56 gears w. 35" tires will put you @ approx. 2134 RPMs @ 65 MPH. That's pretty close to factory gearing: 3.55 gears w. 28" tires = 2,076 RPM @ 65 MPH. With 35's you could even go to a 4.88 ratio (2,284 RPM @ 65 MPH). Depends on where you drive most regularly, street or off-road. . Link to comment Share on other sites More sharing options...
jeepman 87 Posted April 19, 2014 Author Share Posted April 19, 2014 Where is a good place to get a set of gears Link to comment Share on other sites More sharing options...
MuddFoot Posted April 19, 2014 Share Posted April 19, 2014 4.56 is what i ran on my 88 xj with 35s. adams driveshaft and offroad was the best price i could find when i ordered my gears. but i ordered lockers and carriers and covers. they made me a package deal. if you plan to go bigger i would get 4.88s Link to comment Share on other sites More sharing options...
SW86 Posted April 19, 2014 Share Posted April 19, 2014 I'm running 4.88s and I just got mine from 4wd since we get the discount and there's always free shipping. Make sure to get the master install kit as well. Link to comment Share on other sites More sharing options...
mvusse Posted April 21, 2014 Share Posted April 21, 2014 I would not run 4.88s in a Dana 30. The pinion is so freakishly small it would create a weak link. There's a reason Dana never made a 4.88 gear set for it. Link to comment Share on other sites More sharing options...
Eagle Posted April 21, 2014 Share Posted April 21, 2014 I have an 89 mj with an 8 inch lift and 35's. I'm looking at gears but I want to drive on road but also have fun on trails and mud. What size gears should i use 4.88s Link to comment Share on other sites More sharing options...
SW86 Posted April 21, 2014 Share Posted April 21, 2014 I would not run 4.88s in a Dana 30. The pinion is so freakishly small it would create a weak link. There's a reason Dana never made a 4.88 gear set for it. I've seen two 4.56 and two 4.88s in a 30 all bust the ring gear and the pinion was fine. Ill agree it is freak like small but it will still stand up to some punishment..... For awhile at least lol Link to comment Share on other sites More sharing options...
mvusse Posted April 22, 2014 Share Posted April 22, 2014 The small pinion only engages one tooth at a time, causing the ring gear failure. Link to comment Share on other sites More sharing options...
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