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Jon B said:
Geoff, here is an off-topic question: In 1980 I was cruising along on a parkway in my 1937 T with overdrive fitted, and suddenly there was a "chunk" from somewhere in the rear of the car. The motor sped up, and I suddenly realized that no matter how hard I pushed the accelerator, the car slowed down until it stopped. Something was slipping. I ultimately found that the rearend was bad, and left the car at a nearby garage. The mechanic removed the guts from the rearend and I transported them -- along with a NOS ring and pinion gear -- to Nelson Creasy, who put everything together, ready to put back into the axle housing. Then I picked up the finished product from Nelson and transported it to the garage where the mechanic installed it in my Terraplane's axle housing.What I failed to do, was ask anyone what had happened? I still don't know what broke, to this day. I assumed it was something in the pumpkin. But now it sounds like maybe i had a six bolt ring gear (crown wheel) and maybe the bolts broke off.From my description of what happened, can one diagnose what might have gone wrong? Or could it have been one of several things?
Jon B said:
So if one is installing a new ring gear (er, "crown wheel"), and if it has but 6 bolt holes, you are suggesting drilling a few more holes around the perimeter of the ring gear? Then drill mating holes through the differential, and weld bolts (or studs?) to the differential, which will engage the crown wheel? Not sure I understand.
I would love to have 3:55 gears in my '39 112 but am concerned about how hard the 175 would have to grunt to get the car moving from a stop!