I'll let you know if I find one. I'd be willing to ship it to you too.
Whats wrong with your diff? Is it the gears or the center?[/b]
Info. much appreciated. I posted an on-line parts (used) inquiry yesterday, so I'll see what turns up in the next few days. I'm not very hopefull though. Do you or any one know if this differential is used in any other Mazda, truck, car or whatever? I suspect that it's another 'special' piece unique to the '88 - '91 929.
What's wrong is not known, without pulling the differential out and disassembling on the bench. It works fine, no noises, when the car first starts moving, then very soon starts to go 'clunk clunk clunk' intermittently, then randomly like a rachet sound, as if something inside the diff casing is banging on the casing as the gears turn. There is no loss of power to either axle, and the clacking-clunking is the same on city streets as on the highway, it just varies with the speed the gears are turning. Of course, if I continue to drive it, something will undoubtedly let go and I'll then have a really dead beast in my driveway.
From the service manual chapter, I'm looking at that 'knock pin' that holds the pinion shaft in place. It's supposed to be staked in place. One theory is this pin has worked loose and the pinion shaft is moving back and forth, hitting the casing as it turns. I've got no experience with a differential whatsoever though.
I suppose I could take it out and see if the problem is obvious, without any real disassembly, especially the pinion gear itself, which from the manual description, is quite a deal to 'set' correctly to the ring gear. Simply put, I ain't gonna go there, period.
For what the car is worth, I'll say about $800.00 as a used winter-beater, I'm not going to spend much to fix this, time or money. I would change out the differential if I had a used one, and I might, maybe, pull the one in it just for giggles to see if the problem is easily fixed, like a wandering pinion shaft, but as the weather here gets colder by the day/week (we expect snow real soon), any work on this POS is gonna have to be done SOON.
At this point, I'm seriously looking at leaving it as-is just so it can be driven to the junkyard......but man, I really really hate to do that...you know what I mean, after fixing everything up and all...but it looks more and more like throwing good money after bad. ****, I'm torn over this.