I need help with rear Diff.

[obrien9685]

I have a 99 ranger 4.0 4x4 with 157k. A few days ago i started driving and noticed that every time I hit the gas or braking it would jerk..I checked the joints and suspension everything..then i noticed when i had someone drive it and i looked under, it looks like when you hit the gas the whole rear-end pivots up and down like changing pinion angles does anyone have a clue..im goin to try to make a video of it later but if anyone could help that would be great.

 

[mhughes165]

what u are experiencing is called axle wrap, we need more details on the type of rear susp and if u have a lift, if its stock height i would say your u bolts are lose, and i would highly suggest tightening these before any serious damage is done

 

[Ranger44]

Yes check if there is any loose components. Maybe your shocks are badly worn.

 

[obrien9685]

Thanks for the reply.. Every thing on the truck is stock. I've tried tighting the u-bolts and it still does it..i was just going to buy new ones and try that havenet driven it to much since it started doing it though.. Oh ya forgot i replaced all shocks and sway bar links about a month ago

 

[LittleBigFoot]

A lot of the later rangers make a low thud/jult/jerk when taking off and comming to a stop.

If we're refering to the same thud/jult/jerk then I'm assuming it's your slip yoke. The temp fix is to lube it up.

 

[4x4junkie]

Yes, some winding of the axle on the leaf springs is normal (and it may look like a lot). An actual "clunk" "pop" or other noise would not be normal however.
If it only did it on accelerating from a stop, I'd agree that it's the driveshaft slipyoke, although this wouldn't show itself during braking.


Some things to check if it's coming from the rear:
Leaf spring/shackle eye bolts,
u-bolts (sounds like you already checked them, if they're tight and in good shape, no need to replace)
u-joints (although this would usually show as a vibration as well)
Check for a broken leaf in the spring pack (this often causes the truck to lean, but not always).

Hope that helps

 

[srteach]

My 99 4x4 XLT had that problem. There is a TSB about lubing the slip joint of the driveline. That helped cure mine.

Another problem that contributed to it was soft spring bushings. I bought energy suspension (poly) bushings for a 97 Ranger, and they fit perfectly, but had to cut some bolts to change them. Took quite a long time due to the cutting.

Your problem sounds like the drive line slip joint lube problem. Do you need a link to the TSB?

 

[obrien9685]

No thank you I searched the TSB on ranger station thanks for all of your help i will lube the slip yoke and see how that does..Thanks Everyone