How do I tell the differnce between rearends, I need to purchase new rear brake rotors.

 

Easiest way:

Salisbury has a drain plug at the bottom, Dana does not

Cheers
DD

 

does the dana have a drain plug on the rear? looks to be a large allen wrench plug. I need new rotors as well....

 

I dunno; not that I'm aware of, though.







If you don't have a drain plug on the *bottom* of the diff you have the "Dana" type

Cheers
DD

 

If you look at the side of the diff where the drive exits each side, the Dana has three bolts holding a basically triangular retaining plate etc in place through which the drive exits the diff, and the Salisbury has a basically square one held by four bolts.

Look between the disc and the diff. I do NOT refer to the outer end of the driveshaft that bolts through the disc, but to the fixed bearing retaining plate that is bolted to the diff itself.

Greg

 

If you have the choice just get the Dana rotor, that will suit either.

 

Agreed.

Down here the likes of RDA, Protex etc only supply the Dana style rotors, due to the fact they fit either diff unit. Dana needs the access holes, Salisbury dont, its that simple.

Dana was really only used in '85 and '86 approx. An '89 should/would be a Salisbury, if still as made.

As Doug said, NO drain plug is Dana, simple.

 

Not necessarily.
My '88 originally had a Dana with the three bolt pattern...or perhaps it was the '84 that had the Dana. I can't remember, but, I'll look at the '88 rear end on my garage floor when I get home today, and report back. One was Dana, the other Salisbury.
Last year, I replaced the '88 rear unit with the one from my '84, after one of the fulcrum bolts sheared off, and caused the cage to twist so much that it actually tore the cage metal in several locations, and allowed the differential U joint to rotate upwards and make contact with the sheet metal of the shaft tunnel. I had already put a 3.54:1 unit in my '84, so the extra 2.88 unit was just sitting on the garage floor, ready to go into the 88.

Photos of the torn cage, looking from above.


You can see the deformation in the center top of the cage in this photo.

 

I've learned something new before finishing my first cup of coffee! Now I can take the rest of the day off

Cheers
DD

 

well, looks like i'm going to have to tear into it sooner than later. Tried soaking the caliper pistons to free the two outer ones(inner ones moved fine) and they still wont budge. I can get about 1mm travel in them both... just enough to release the "pad" that was left. Quotes means there was no pad... metal on metal made for a very quick rotor destroyer. Now to look into removing calipers and rotors...

 

I have the rear suspension out of my 89 right now. I ordered rotors that were supposed to fit the salisbury type diff, but they are wrong. The rotors on this car have differently spaced holes for the stub axle bolts. One pair are approximately 2 3/8" apart, and the other two are approximately 2 7/8" apart.

 

I have a feeling that the four studs are not equally spaced. You might try turning the disc rotor clockwise 90° and trying again.

Greg

 

Almost ALL 1980'-1990's Jaguar Diff internals are interchangeable (NOT THE HOUSING). All XJS, XJ40 XJ6 are Dana 44. It is only the flange that is different between the 3 bolt and 4 bolt, the internals are still Dana. I have XJ40 internals in my XJS diff, all that was needed was to cut the snout off the pinion and use the XJ40 pinion nut.

Xj40 axles bolt directly to the XJS diff, They even have spacers in place of the inboard discs.

As Grant said the "Dana" Rotors have 2 additional large holes. In fact my GKN Salisbury rotors have these holes.