I’ll be brief - on Sunday when I got back from taking the RX7 for a post-wax drive around the block I noticed a new CD-sized spot on the floor of the garage under where it had been parked for the prior week - but where it would have been under the rear end. A quick touch-n-sniff confirmed it was gear oil. That spot wasn’t there before (of all the things that parking spot’s previous occupant leaked, gear oil wasn’t one of them).

Last night I put the rear up on stands and checked - the diff was incredibly low. It wasn’t empty, but I feel really bad having driven on it (possibly the whole way from new york) with such a low level. I’m concerned for my bearings. I cleaned off the housing (which was so covered in oil it had clearly been leaking for a long time) and put about 2/3 of a quart of 75w-90 left over from the Chevelle’s axle (it was still low).

Today after work I stuck my head underneath and verified it was coming from the seal between where the housing and the differential carrier (it’s a ford 9" style where the diff is on the third member, bolted into the front). Bummer, I said, since it was leaking a lot and that would be a pain in the butt to fix.

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But wait, some quick google-fu said that a couple people on the forum had been able to crank down those bolts and slow or stop similar leaks - it’s worth a shot. There are 8 bolts that hold the third member to the housing.

One was very tight.

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Three were snug.

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Two were finger tight at best.

Two weren’t even finger tight. I’m amazed they hadn’t fallen out.

They’re all tight now, and I sprayed off the housing again. Hopefully tomorrow evening there’s no drip forming.