Backing the GTS Into a parking space today and I was getting popping sound coming from the rear end. Third member is a 741 case w 3.91 and a Suregrip. It came with the the car and howls a bit. We checked the gear wear pattern and it looked good.

I was thinking it's may be several things

1. Needs more whale oil added. Clutches are making the popping sound. I need to check fluid level

2. Axle end play is off. In my mind this should only affect the wheel bearing

I should note it doesn't make a sound going forward right or left. Only backing straight, right and left.

Opinions?

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