Check your front differential mount bolt

[amr89c4]

Ladies and gentlemen,

Be aware that the front differential mount bolt backed out on my 964 to the point it allowed the diff to lift the rotating CV flange up into the Power Steering return hose, slicing it at the hose crimp. You will loose all your PS fluid shortly thereafter.

My car only had 52,000 miles on it. I do not know how long it had been working itself loose to the point that damage occurred. My only warning was a shift from 1st to 2nd at 6,800 at which time I got a loud "thunk". Fortunately I was only 5 miles from home. Fluid was pouring from the cut which cannot be seen with the front windage tray in place. I thought I had blown a diff seal.

I suggest it prudent to pull your front windage tray and check the torque on the large, single mount bolt on the aft end of the diff. It could save you a lot of time and a lot of money. It isn't difficult to remove the front tray for inspection. If I had not drove the car hard and heard the "thunk" on that hard shift, then I can only wonder if the bolt would / could have backed completely out, unbeknownst to me, allowing the diff to probably wreck the entire front end.

If mine came loose and backed out, then it only follows that others could too. I cleaned the bolt which looked perfectly fine, cleaned the mount threads and applied blue loctite and retorgued. I marked the head of the bolt with a shop paint marker to make it easy to check if the bolt migrates again.

Lynn

89 Guards Red C4

[Atlantic07]

Sorry to hear and thx for the tip.

I had to think a while and then realized that my C2 luckily does not have a front differential