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Old 03-27-2018, 11:38 PM
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Gear ratio off

Ok so I have a 90 yj 4.2 i6 that loses all power in 5th and 4th (if I'm going uphill) I read I should do like 4:10 ratio with my 31 inch tires and I've heard Dana 60's is where it's at.... until 5 minutes ago when you all said rear Dana 60's are crap. Can someone tell me what I need that will "love me long time" and isn't a "paperweight" as one user put it. I'm not a mechanic but have replaced my clutch, water pump, distributor cap and plugs, fan clutch, cleaned the valves and valve cover thoroughly. If you all can send me in the right direction I'd greatly appreciate it. Thank you all in advance.

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Old 03-28-2018, 12:12 AM   #2
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I'm curious: is this the way the jeep's always been, some new behavior, or did you just obtain this jeep? Just put the tires on?

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Old 03-28-2018, 01:32 AM   #3
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Nothing at all wrong w a dana 60 but the stock dana 35 is fine for 31's...
Just don't go slapping a locker in it....

Best bet, find a cheap used set of axles from a yj with a 4 cyl 5 speed... they'll be 4.10's and bolt right in...
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Old 03-28-2018, 10:15 AM   #4
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Is it a daily driver or are you building a crawler? If it's a daily driver just regear to 4.10. If you are doing occasional trails add upgraded axle shafts while they are changing the gears. If you are building a crawler it's all about how much money you have as when you start moving up 35" -40" tires you will need want to go to a dana 44 or Dane 60. Remember a dana 60 will also add weight.
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Old 03-28-2018, 03:08 PM   #5
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My '95 YJ, 2.5L 4cyl. AX15 5 speed with 31's was like that on flat ground (not many hills in Delaware). 5th gear was useless. I went with an 8.8 from East Coast Gear, and 4.88's. Air locker in rear and TrueTrac in front (plus RCV joints, 31 spline axels, and more...).
The difference is amazing. I can actually accelerate in 5th gear on the road, where before I couldn't even use 5th.
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