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Local breakers yard sold me a 1979 single rail J type OD box for $100.00, but I note that there were some small metal bits that came out with the gear oil. So I expect it needs some repair despite the odometer only showing 41K miles (141K miles?). I did know to grab the original prop shaft while I was there. Trans is very clean externally, with evidence of having been worked over in some manner since I see red silicone sealant here and there. Clutch assembly appeared virtually new but had a damaged disk as whoever worked on the car last put it in backward! I expect that driving the car even a short distance with the disc fouling the flywheel bolts would have made for problems. The car looked like someone put money into and then let it sit out, a shame as it was very strait and rust free. I can see the owner being frustrated by this simple error. To the question, how hard is the single rail J type OD box to rebuild? Parts availability? Parts interchange from single rail non-OD box? I've already seen threads here warning about the new synchroes being junk. Also wonder if I should go back for the OD cars rear diff? Not sure what ratio it would be, same as I already have or not? Was going to sell the '79 (Oct-78) Spitfire 1500 since the engine has low oil pressure. But with an OD box it will be much better suited to our U.S. freeways so I think worth rebuilding the engine and keeping it. Fuel prices are on the rise again so I need something more thrifty than an XJ6 and hot-rod El Camino. Car came already fitted with a 40 DCOE and headers so I wonder how much more may be worth doing to the engine? I already have new flat-top pistons.