The Shop > Axle / Differential

AMC Eagle rear axle ratios interchange

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amcfool1:
hi, gz again:) i have the 79/80 AMC parts catalog. Parsing it, it says the the EAGLE rear axle could take the 3:08, 3:31, and 3:54, though the books tooth count for 3:54 is confusing (11/39 which is the Amc 20 count) instead of 13/46 which is the Amc 15 count. (according to this book) However, looking at the Spirit/Concord rear axle, same part # for 4/6 cyl. cars, (though different from Eagle), book says axle can take any gear set from 2:37 to 3:58. Why would the Eagle axle housing be any different? got my fingers crossed on this one!  :) So, extrapolating a bit, if a 3:08 fits where a 3:54 goes, and the 2:73 goes where a 3:08 goes, it should work in a 3:54 case. If the Eagle housing is same as Spirit/Concord housing, then any gear set should fit. This would really solve my problem. Maybe most of the gear incompatibility issues regard the FRONT axle, not the rear?  Thoughts?   thanks,   gz

AMC of Houston:
Y'all are confusing the gear carrier differences with the axle housing differences.   Different gear carriers are needed with different ratio gear sets, but the axle housings are the same for all carriers whatever the ratio -- i.e; any carrier/gear set combo will fit in the housing; you just need to have the correct carrier for your gear ratio.

amcfool1:
....so, the 2;73 complete setup, carrier with ring and pinion, axle shafts, backing plates, etc, should fit into a (originally) 2:35 axle housing assembly, correct?
and thank you so much for responding.  gz

AMC of Houston:
Yes indeed!   You are correct.   I would also swap over the shim under the big pinion bearing race from the donor housing, so you'll be more likely to have the pinion depth where it should be.   Would be a good idea to check the pinion depth after the swap if at all possible - if not, just hope for the best.  If no clunking/whining, its probably close enough.

amcfool1:
well, ok then! The adventure continues.....Thanks again!  gz

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