Driveline vibration out of now where! Help!

mopower440 said

I had the axle bearings replaced back around 1998 or so, and it probably has not got 1000 miles on them now, but yes, it does sit in the garage a lot, so..I will check that..Tomorrow i am going to pull the driveshaft and make sure the u-joints are not frozen..The bad thing about that is that its been so long ago that i built this car, i cant remember what u-joints i used..I remember buying a driveshaft at a junk yard from a mid 70's big block cordoba to use. If i remember right, i had it cut down and had new u-joints installed at a driveshaft shop..but dont remember what size joints..

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OK 1998 that was 20 years ago, time flies when we are having fun. Unfortunately time and moisture and sitting can do more harm than the miles a person puts on.

Just curious if they were the new "Green Sealed Bearings" you installed in '98 or the Mopar-you-pack-em, open style bearings that came factory and end play adjust the axle on the passenger side. If you have ever taken Boat Trailer bearings apart that had water in them you will know how bad things can get just sitting. Rust Never Sleeps.

Mopar U-Joints come in the Small u-joint or the Large u-joint.

Here are the Moog Part numbers:
(Used on the 8 3/4 rear ends)
Small Mopar U-Joint 7260, 2 1/8"
Large Mopar U-Joint 7290, 2 5/8"

Moog also makes a combination U-Joint for the small U-Joint Drive Shaft that mates up to the large size yoke on the rear end. They just call it the 7260/7290 Combination U-Joint by Moog.
Some driveshafts are made with the Small 7260 joint up at the front by the trans, and Large 7290 joint at the rear of the shaft to go with Large Yoke rear ends. So it pays to measure and find out just exactly what you have got.

OK, will be interested to see what you find when you go at it again . . .