News: Putting FUN and FRIENDLINESS, FIRST into owning and learning about AMC small bodied cars, primarily Eagles, Spirits and Concords as well as vehicles built in AMC's Mexican subsidiary, VAM.

The AMC Eaglepedia can now be accessed using the buttons found below  This is a comprehensive ever growing archive of information, tips, diagrams, manuals, etc. for the AMC Eagle and other small bodied AMC cars. 

Also a button is now available for our Face Book Group page.


Welcome to the AMC Eagles Nest.  A new site under "old" management -- so welcome to your new home for everything related to AMC Eagles, Spirits and Concords along with opportunities to interact with other AMC'ers.  This site will soon be evolving to look different than it has and we will be incorporating new features we hope you will find useful, entertaining and expand your AMC horizons.

You can now promote your topics at your favorite social media site by clicking on the appropriate icon (top upper right of the page) while viewing the topic you wish to promote.


  • March 19, 2024, 06:20:20 AM

Login with username, password and session length

Author Topic: AMC Eagle rear axle ratios interchange  (Read 876 times)

0 Members and 1 Guest are viewing this topic.

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
AMC Eagle rear axle ratios interchange
« on: April 13, 2023, 12:04:22 PM »
hi, I have a 1984 Eagle sedan, nice shape. I am trying to replace the 2:35 axles with 2:73 axles. I have both front and rear 2:73 axles from a parted out 85 wagon. The front is fine. The rear, however has a bent housing. I have a chance to purchase a complete 3:54 rear axle. My question is; will the 2:73 carrier, ring and pinion, etc, fit into the 3:54 housing/axle? In other words, what is the carrier break?  Thank you all.   gz

Offline AMC of Houston

  • The only thing we learn from history is that we don't learn from history.
  • Global Moderator
  • Eagle Sundaancer
  • *****
  • Posts: 893
  • Thumbs Up 86
    • American Motors Club of Houston
Re: AMC Eagle rear axle ratios interchange
« Reply #1 on: April 13, 2023, 03:16:05 PM »
Educated guess says yes; it should work.   Reasoning being the AMC Eagle parts manual shows the same housing part number for all gear ratios.   Although the gear carriers show different part numbers for different ratios, the axle housing part number is the same for all.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
Re: AMC Eagle rear axle ratios interchange
« Reply #2 on: April 13, 2023, 11:34:08 PM »
thank you!  gz

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
Re: AMC Eagle rear axle ratios interchange
« Reply #3 on: April 13, 2023, 11:38:35 PM »
but not the 2:35, correct? In other words, one can't put the 2:73 in the 2:35 housing, can one? I always though that the 2:35 was its own unique beast.  gz

Offline vangremlin

  • Administrator
  • AMC Eagles Den Addicted
  • ******
  • Posts: 4407
  • Thumbs Up 212
Re: AMC Eagle rear axle ratios interchange
« Reply #4 on: April 14, 2023, 11:27:58 AM »
but not the 2:35, correct? In other words, one can't put the 2:73 in the 2:35 housing, can one? I always though that the 2:35 was its own unique beast.  gz

That was kind of my understanding also.  May require some more digging to find out. 
1981 Kammback 258 - "Pepe"
1980 Coupe 258 - "Ginger
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390 - sold

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
Re: AMC Eagle rear axle ratios interchange
« Reply #5 on: April 14, 2023, 01:59:12 PM »
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

Offline AMC of Houston

  • The only thing we learn from history is that we don't learn from history.
  • Global Moderator
  • Eagle Sundaancer
  • *****
  • Posts: 893
  • Thumbs Up 86
    • American Motors Club of Houston
Re: AMC Eagle rear axle ratios interchange
« Reply #6 on: April 14, 2023, 02:51:30 PM »
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.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
Re: AMC Eagle rear axle ratios interchange
« Reply #7 on: April 14, 2023, 11:50:56 PM »
....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

Offline AMC of Houston

  • The only thing we learn from history is that we don't learn from history.
  • Global Moderator
  • Eagle Sundaancer
  • *****
  • Posts: 893
  • Thumbs Up 86
    • American Motors Club of Houston
Re: AMC Eagle rear axle ratios interchange
« Reply #8 on: April 15, 2023, 01:25:17 AM »
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.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline amcfool1

  • Eagle Limited
  • *****
  • Posts: 638
  • Thumbs Up 31
Re: AMC Eagle rear axle ratios interchange
« Reply #9 on: April 15, 2023, 07:03:11 AM »
well, ok then! The adventure continues.....Thanks again!  gz

 

SMF spam blocked by CleanTalk