sundayrider

Lifted my jeep 89YJ 4" and put the 33" Cooper SST on. Results is a vibration in 4WD at about 80 KLM/h. Also in 2WD I have no power at approx. 100 KLM/h. I know I have seen the fix in here somewhere. Any ideas how to rectify?

Thanks

patyjlongmire

Are the tires balanced. bad u joint?

sundayrider

Thanks for replying to my post. Your the ONLY one that does ha ha. One of the issues is the new angle of the drive shaft. Apparently I can shim that, but I dont think I'll be driving in 4x4 @ 80. The other low power issue could be my ring and pinion gear. I have to figure out what gear is in before I know if I have to change it. I will add a picture of my rig.

Thanks

patyjlongmire

I would bet that gears you have are 3:07's that is what most jeeps with 5spd's came with. Jeeps with 4 banger had 4:10's and auto's mostly had 3:55's. I had lack of power with my, on the highway aswell. But now I have v8 and 4.10's. Rear shaft angle you can rotate rear axle to help that. I reply to most jeep stuff jeep things are like a drug to me.

sundayrider

sounds like the perfect power fix......V8. I have to crawl back under and see what I can find. I tried to upload a pic but it says it to BIG. I hate computers..... :)

Mr White

iTrader: (1)

Try "paint" its a program that is usually in Microsoft computors works great I find if any picture is too large using this program and it gets reduced. To the other problem what the H.. are you doing 50pmh in 4 wd? I had the same problem when I did the lift, try changing the steering stabilizer (shock sideway in front), balance tires, how big an angle are your diff's, you might need a SYE? I didn't on the 4" lift but I had a very knowledgeable person doing it for me. Nice to have Good friends.
No power - I have a 6 cy std and with the std 3.07 gears I lost 5th gear, but Now with 4.11 gears its like day and night. This
might help you get ur power back.

sundayrider

Thanks on both accounts Mr. White. I am just getting into this jeep thing, so I will NOT be driving in 4wd at 50 again. As far as the gears go. I found a metal plate that says my gears are 3.72. What gears are compatible???? Are they easy to change???. I heard to have to change two sets of gears at the same time. I will try to PAINT some pictures on here later.Thanks again for you posts.

patyjlongmire

if you want to use 4wd you must change front and rear gear sets. not that tough to do.

sundayrider

Thats where i'm headed. 4.10:1 gears enough? Im hoping to look at a 4cyl on the weekend with 4:10's How much should they be worth.

sundayrider

found a 90 4cyl I have the tag in my hand from the rear diff. It has many numbers but not 4:10. I will check with the dealer tomorrow and my haynes repair book.