It also happened that the 1980 RX7 came stock with a open rear diff and drum brakes, neither of which are especially good for racing.
We started doing some research and round that the rear end from an '82 GSL had both a limited slip rear diff AND disc brakes, and it's a bolt-in mod. It was back to the Internet, and before long we were once again rewarded by the Craigslist gods. We found a guy way down in Toledo who was parting out a 1982 GSL, and he still had the rear end.
The soonest we could get down there was Monday, July 4th. I had thrown my yearly 4th of July party the day before and we were all feeling the next-day glory of a keg of beer and numerous tequila shots. Nevertheless, we drug our sorry butts down there and proceeded to crawl around in the dirt trying to figure out how to remove the rear end. We'd never done it before (and in our diminished mental state we forgot most of the tools we might need), but luckily the guy helped us out.
An hour later we had a rear end, a working spare alternator, and a rear brake hard line. Why a hard line? I'd like to say it's because we had the forethought to know that the thread pitch on this rear end was different than our car, which is true. But in reality, in a battle between a hard line and a drill bit, the bit wins every time. Yes, we broke the one rule common to both drilling holes and shooting guns: Know what's behind your target.
We removed the front rotors and rear axle shafts so we could get a look at the bearings and replace them. We found that we couldn't remove the bearings without a 5-ton press, so we left them on (they looked to be in pretty good shape, anyway).
We cut off any extra weight we could in the process. Notice the standard safety clothing...
I'm not sure what the average time is to rebuild 4 calipers; I like to think that 7 hours is a pretty good first time. I should have taken some pics during the rebuild but my hands were just too damned dirty. Eventually we figured them out and got them all cleaned up, the seals replaced and packed with new grease, and installed with new brake lines. The thread pitch issue is still plagueing us (we only have one working front brake at the moment), but we'll get that sorted out later.
With new rotors and pads, they don't look too bad. Not sure how they'll perform, though...
Next step: Fun with Dry Ice!













