I was driving and kept here an clunk sound when I go from drive to reverse. I looked at my drive shaft and I found the problem instantly.
I have a rubicon express rear ds and was wondering what size is the u joint and how hard is the fix?

 

Easy fix. U joint should be Spicer 1310. Local NAPA or CarQuest should have the joint for 10 or 15 bucks.

 

Thanks I will fix it today

 

Autozone says they don't have u joints. And napa is closed. Where else could I get a freaking u joint

 

Autozone dont have u joints. I just got one at autozone in indiana. Ask for the store manager.

 

They ask what year my jeep was and they kept saying oh that's a cv joint. I said yea the stock ds are. I have an aftermarket ds that uses a u joint. They said we don't carry u joints or aftermarket parts. I just walked out pissed off. I went to discount auto and I told them about it and 2 seconds later the guy hands me a u joint. Lol

 

Great, at least you have found one. Good luck and happy holidays.

 

Did you get fixed yet?

 

Pita but I got the old u joint out and was about to put the new one in and it's to big.. So hopefully the parts store is open on thanksgiving

 

OP says he is running a Rubicon Express drive shaft. They typically use 1310 joints.

Use this chart to measure and compare your existing joint.

h t t p://www.actionmachineinc.com/ujointmeasuringguide.aspx