OverlandMJ Posted March 13, 2012 Share Posted March 13, 2012 I'm running 3.5 " suspension lift with 31's. 4.0 and 5 speed. Wondering what gearing I shoud be running? Dogging it up hills on the interstate. 3:55 or 3:73's? Would like to do a 44 in the rear if not a 8.25 with disks. Thanks fellas. Gary Link to comment Share on other sites More sharing options...
86customanche Posted March 14, 2012 Share Posted March 14, 2012 Personally, with your set up, Id go at least 3.73, maybe even 4.10. It really depends on what kind of driving youll be doing. The more offroading/slow speeds, the higher ratio will suit better. But if youll be doing a lot of highway driving, something a little lower will work best. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 14, 2012 Share Posted March 14, 2012 4.10 w. 31s. It's just a bit lower than the stock factory final drive ratio and won't hurt mileage. Might even improve it a bit. :cheers: Link to comment Share on other sites More sharing options...
Boots Posted March 14, 2012 Share Posted March 14, 2012 I have 3.73s with 31" tires, 4.0 liter, nv3550, np231, dana44. 65 on the free way is a just little over 2000 rpm (not exactly sure since my speedo doesn't work properly). It does just fine but was much funner to drive with the factory size tires. I've had my 31" tires spinning in 4wd Lo in 3rd gear on a dirt hill before, but in 4HI it just bogs down even in 1st. 4.10 probably would have been better... I'd just go with 4.10, if it ends up too low for you liking then just go to bigger tires. lol. Link to comment Share on other sites More sharing options...
Eagle Posted March 14, 2012 Share Posted March 14, 2012 I'm running 3.5 " suspension lift with 31's. 4.0 and 5 speed. Wondering what gearing I shoud be running? Dogging it up hills on the interstate. 3.55 or 3:73's? Would like to do a 44 in the rear if not a 8.25 with disks. Been there, done that. I had my '88 set up with 3.73s and 31x10.50 tires. The speed:RPM ratio was EXACTLY the same as my wife's XJ with stock tires and 3.54 gears. It was ... "okay" ... but I really wish I had more gear. I put the 3.73s in because I had them, but they were bought with the intention of running 30x9.50 tires, not 31s. IMHO for your setup you should be running 4.10 gears. Link to comment Share on other sites More sharing options...
SW86 Posted March 14, 2012 Share Posted March 14, 2012 i don't know what gears you have now but there is a carrier break for the dana 30. its at 3.55/3.73. 3.55 and down vs. 3.73 and up. i just had to buy a new carrier because i had 3.55 and down :( Link to comment Share on other sites More sharing options...
carnuck Posted March 17, 2012 Share Posted March 17, 2012 I put 4.10s in my '87 with 4.0L, BA 10/5 and 33" tires. I had NO freeway cruise speed! Power band was negligible. I put 3.73 back in and it rocked! Link to comment Share on other sites More sharing options...
OverlandMJ Posted March 23, 2012 Author Share Posted March 23, 2012 It's a daily driver and will be alot of freeway driving. I'm gonna go with 373s thanks guys. Link to comment Share on other sites More sharing options...
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