tonybeirut

1994 XJ 4"5 lift RC, TC drop, Schacles. front LCA...

I have a light vibration at 40 45 KMH and the garage told me that i should cut and weld the DS by 2 cm (thats what they are doing for such a problem)

Attached is some pics of my DS position (jeep rear standing on 40 cm floor, not straight)

I know i should install a SYE but in Lebanon is hard to find and if shipped from the US it costs double its price.

Any work around to fix that vibration?

93_xjcherokee

Your driveshaft doesn't look like its that bad of an angle. Have you checked your tires for balance?

tonybeirut

Unbalanced tires gives vibrations ? how can i check if my tires are balanced?
Attached new pics of the driveshaft with the Jeep on straight ground.

jtm01xj

You also can get some degree shims for the leaf spring if you need to change the pinion angle

tonybeirut

2-4-6 inch shims? how do i know which one to get?

SeriousOffroad

Measure your angles with an angle finder.

Tonis506

I would check tires first and measure the angles. Although it looks half way decent. Maybe pinion down a few degrees

cruiser54

When's the last time you greased those u-joints?

salad

^^^

Those U joints look original. First things first - grease 'em up. They get worn into a pattern and used outside of that tend to cause vibrations. Some new ones are probably in order.

Also look into some degree shims for the rear axle so that the pinion lies flat, parallel to the transfer case shaft. Just like in the image SeriousOffroad posted.

And another tip - to fix how poorly your Jeep rides you'll want to either get longer leaf springs or a kit that will move the shackle mounting point forward (these usually add a little bit of lift, mind you). Your rear suspension feels non-existent because the shackles point straight down instead of about 45 degrees back.

Fred/N0AZZ

Last posts right on the money and lowest in cost to do.

denverd1

typically 1* for each inch of lift

Lightning_19k

I am running into the same kinda thing (at a little higher speeds though), where can I find degree shims and what are they? I've also seen people of this forum say that this type of problem could be caused by improperly balanced tires. How can I tell which it is?

Also, does someone have a ball park for what I could expect a shop to charge (or labor hours) to cut and weld the rear drive shaft?

freegdr

Shaft looks too long also might bottom out inside slip yoke. Drop shackle do same thing as shims. Might wanna remove TC drop and test drive. Which will pull Ds out a little.

Rogue4x4

Degree shims are added to your leaf pack to change the angle of the pinion of the rear axle, to get you in the 1-3* range of both u-joints on the drive-shaft. Anything greater than 3* between the two will most likely give you vibes. Those who say "it looks fine", ignore, it may not look bad, but the numbers will tell the story. Measure properly, and adjust accordingly. As far as your tires go, take it to a tire shop, and have them tested for balance. Easy-peasy-japanesey. If your tires ARE balanced properly, eliminate them from the list. A balance of all tires should be relatively inexpensive. If your tires balance out, then check your driveshaft angles with an angle finder, they should be within 1-3* of each other.

As far as cost goes, most of us here live in the states, with a few exceptions, and even here, price varies widely. Go to several different shops and get some quotes. Also, remember, when dealing with a driveshaft, it needs to be balanced properly. You can't just cut, weld and go. Make sure they balance them as well, and you should be good to go. Hope this helps you.

tonybeirut

I went and installed shims then did tires balance . The sy went out a bit from its case . I have a bit of improvement on vibes but not totally gone.