ive lifted my jeep 3 inches an put 37 inch tires on it. the angle of the driveshaft is too steep and is now starting to make the bearings inside the differential squeal.
what is the remedy for this? what should i do?

 

Replace with a stock shaft. Drive until if fails. Replace with stock, repeat.

Or move to an aftermarket double cardan. These shafts need different pinion angles than the stock shafts, so you may need a set of adjustable control arms as well.

 

That's what the guy at pep boys said. It makes sense my rear driveshaft is in a steep position

 

Lol, I missed the differential part. Are you sure that it is the diff, and not a blown joint on the driveshaft?

 

basically i need to make my driveshaft not be so steep or im going to ruin a bearing. the bearing is what is making that high pitch squeal, whistle, whatever you wanna call it. i just need to adjust that driveshaft so its not on that much of an incline.

 

That doesn't sound good. Lifting the Jeep could possibly cause a pinion angle issue resulting in a front drive shaft vibration. However, I've never heard of this causing a bearing squeal.

The only way to adjust pinion angle is to install adjustable upper control arms. Changing the pinon angle will effect the caster so you might want to have an alignment shop perform a computerized 4 wheel alignment. With the amount of lift you have you might be okay with 3-4* of positive caster. This should put your pinion angle close to where it needs to be. By eye, the pinion will almost be in line with the drive shaft when set at the proper angle. You can search the forum for pinion angle to find some pictures of what good and bad pinion angles look like.

Pinion angle can be checked with a digital angle finder (purchased from harbor freight or a hardware store). You will want your vehicle parked on level driveway or garage to get an accurate reading. Remove the drive shaft from the front differential. Place the angle finder on the end of the diff yoke to find the current angle. The yoke should be pointed up about 2*. Your mileage may vary.

In any event, you may want to have a 4-wheel drive shop check this out for you.

 

yea i should do that, but either way i need to make it so my rear drive shaft isnt so steep right? or will it be ok?

 

Adjustable control arms will tilt the axle.

With stock driveshafts, you generally want the pinion to be parallel to the tcase output. With aftermarket double cardans, you want the pinion pointed up at the tcase output. Too far off, and you get driveline vibes. so keep that in mind with your adjustments.

You might also consider both sets of ca's to move the entire axle back in the wheel well.

 

would it be a smart idea to remove the 3 inch lift and put a 2 inch lift on?

 

so control arms would be the only fix for this?