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YJ has 4.0 1900 rpm at 70 mph doesn't lug, it does lose speed till I have to down shift.

Yes that is what I meant a have been having trouble entering text. The 1900 rpm at 70 mph has a difficult time managing hwy grade. If I start the same grade 2200 rpm can make the grade without down shift. Anyway I don't want to run 2500 rpm at 60 mph. Its 125 miles one way to my deer lease, I...

Thank you both for the reply 4.11 is as big as I an go without all kinds of fab work, or a very expensive up grades. I good with the performance of my YJ. I need 300 or 400 RPM @ 70MPH. I can pickup the rear for 900.00, front 400.00 both have less than 70000 miles on them. I do not think I can...

The rear diff went to the happy hunting ground today, the front diff has been on it last leg, they are 3.55''s. I have been planning to swap both with 4.11s. Can I replace the rear with the 4.11, then the front at a later date, and still drive?

Make sure you ream the inside end of the tubing, check your new flare against a old one. You should do fine.

Replaced the ujoints front and back. I have had the front tires off the ground don't seem to have slack in the axel joints. Tires have no cupping or uneven wear. It is a weird deal...

New to the forum... I’ve had my 91 YJ, 2 years now, will drive it till I can't clime in anymore.

Trac bars have been removed, checked shocks worn but seem ok. The sound, maybe a bearing with a ball missing. don't have any play in the steering, doesn’t pull left or right. Only may the sound after driven for a while. Then every right or left low speed turn after turn no noise. Thanks to all...

I have had my 91 YJ for 2 years now, and it has been making the sound in the thread title... I have checked the the front end joints input shafts pulled the cover on the front end changed the fluids, checked the breaks, and shocks, noplay in hefroun end. still have the sound coming from the...