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3.15 rear end |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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That makes swapping gears with older models more difficult! An older carrier would need the bolt holes drilled and tapped for the larger bolts, or a shoulder bolt used. Almost impossible to use an earlier ring gear on a later carrier though. You'd have to lay out a new pattern of holes between the existing ones and drill and tap for the smaller size. Not impossible, but a lot of work. Luckily there is no real reason to do that!
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Frank Swygert
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Rambler Joe
AMC Fan Joined: May/11/2022 Location: Lynnwood, WA Status: Offline Points: 10 |
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My '66 Classic wagon (327 4bbl) came with a lower ratio, and I swapped out the rear axle to get a better highway ratio of 3.15:1. That donor car was a '65 Classic with a 287 2bbl. Both cars, of course, came with torque tubes.
My original question is whether or not a ring and pinion gear set for a '60 through '64 (so states the seller) will work in my '66. I'm thinking it will, since there weren't any big changes until '67. From what you explained, it appears that I may be correct.
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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There are actually quite a few ratios for the later AMC20 if you look at the Jeep line that used the AMC20 as well. See last page for all the ones that I could find.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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jpnjim pointed something out to me in a PM -- the ring gear bolts thread into the RING GEAR, NOT THE CARRIER! DUH! I knew that!! I goofed and wrote it backwards though. Thanks Jim! So shoulder bolts would work to put the older ring gear on the newer carrier, the older carrier holes would have to be drilled out from 3/8" to 7/16" to mount a newer ring gear. The problem then would be the pinion shaft length, diameter and splines. I don't know how they match up to the torque tube axle pinion shaft. IIRC they are the same, but I haven't had them side by side nor tried the yokes on each. Again, IIRC, AMC just machined the pinion shaft to have a threaded end for a nut to hold the yoke on -- I don't know off the top of my head if the shaft was shortened to allow for machining the threads or lengthened, nor for certain if the splines and diameter stayed the same. Someone would have to compare them. I think the bearings stayed the same... but not 100% sure of that. SC397 -- I was just referring to factory AMC gears. Noting that there are many other non-factory options was a good idea though, I should have thought about that!
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Frank Swygert
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