The guys have covered most of the obvious issues. For my 2c worth I would agree that the main main sources are: 1) Blocked drains in the windshield wiper recess. This can also be made worse if the car is not parked on the flat. So remove the black cover and make sure the 2 drains from the cover are ...

Maybe try heating it to soften it before yanking on the seal.

Neil.

Chances are the sleeve between the trans and the angle gear splines has stripped out. Unfortunately, this may have damaged the splines on the angle gear too. Only way to confirm is to remove the angle gear and check the 2 parts.

Neil.

Most likely the center support bearing rubber has failed. As suggested remove the prop-shaft to the rear and see if the issue disappears. While under there check these too: 1) AWD system: Prop-shaft front bearing at angle gear, center support bearing, viscous coupling front bearing and VC casing fro...

See if Erie Vo-Vo has one in the right color and how much to ship to you if you don't have time to look for the parts.

Neil.

We say it time and time again that the parts used can determine issues you may get. Can you state the brands of the parts you fitted as some brands are known to be incompatible with these turbo motors.

Neil.

Check the splines are not rounded on their edges on both parts and fit fairly tightly together with ideal no slop between the 2 parts. Naturally there should be no chips or missing sections too. Look for a lot of wear or a groove where the seal in the transmission on angle gear sit so they do not le...

When you get it make sure the connecting collar and the splines it attaches to on the angle gear shaft are not damaged or stripped which often happens with age. So check they are a snug fit to each other. If the angle gear splines are bad it will strip when load it applied. I wouldn't suspect the VC...

Are you sure it is the head and not a failed oil cooler in the radiator? It may be worth pulling the radiator and have it pressure tested for a failure in the built in oil cooler.

Neil.

I think I have used the 24 before in my P80's but the test is to make sure the locking tab will install as I recall the battery is longer. It can't be wider as it won't fit in the channel in the battery tray otherwise. Also check the battery has the wider base with the part that slips into the chann...