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AMC Model 15 Rebuild help (Read 4118 times)
getch
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AMC Model 15 Rebuild help
12/19/11 at 14:14:29
 
Hi All
My AMX's rear end needs to be rebuilt. I dont know if its something I should tackel or not having never set one up. Im looking for suggestions or maybe a thread where I can find simple instructions. I would welcome any help from the local guys as well.
Last resort is bring it to a shop and have them do it.
 
Getch
Southern Maine
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Re: AMC Model 15 Rebuild help
Reply #1 - 12/21/11 at 00:18:09
 
Well.......I'll jump in here and take a shot at answering your question. I got to start by telling you that 2 rears I've attempted to rebuild have failed. A lot of precise measuring and patience is needed. I think I'd rather rebuild an engine. I've thought about changing gears in my 68 to a more streetable gear ratio but found it cheaper just to swap it out with a known good stock posi rear. I consulted the good old Chiltons and Motors manuals before deciding I wouldn't do it, plust the parts prices for me were astronomical. Good luck!
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Re: AMC Model 15 Rebuild help
Reply #2 - 12/21/11 at 01:16:57
 
I would try and find another rear, but if your ambitious you can do it your self.  I find Randys ring and pinon tech section most helpful, I've done a few, there is a learning curve but it is not super difficult.  I did a for  8.8 twice that held for years behind a 302 and 4 speed with 38" boggers, and a dana 35 in a jeep that has been together a few years of normal driving,  It is time consuming, but it can be difficult to find someone to take the job on.  Good luck Andy
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Re: AMC Model 15 Rebuild help
Reply #3 - 12/21/11 at 10:05:57
 
Quote from getch on 12/19/11 at 14:14:29:
Hi All
My AMX's rear end needs to be rebuilt. I dont know if its something I should tackel or not having never set one up. Im looking for suggestions or maybe a thread where I can find simple instructions. I would welcome any help from the local guys as well.
Last resort is bring it to a shop and have them do it.

Getch
Southern Maine

I guess the first question should be why does it need a rebuild? I've found installing spider gears in a posi rear to be challanging, since the clutches have spring pressure on them, and setting up a new ring and pinion can be tedious, but replacing a pinion seal doesn't have to be difficult. What does your differential need?
 
Dave Z
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Re: AMC Model 15 Rebuild help
Reply #4 - 12/21/11 at 17:28:39
 
Bearing are shot ...not sure if its wheel (easy) or carrier (hard)
Also I think its out of spec...I get a lot of fore and aft play when I push/pull an axel.
When both wheels are up the wheel moves a good 1/2"-3/4" before the pinion turns.
Its a posi unit original to the car which is rather exceptional shape. California spec 2.73:1
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Re: AMC Model 15 Rebuild help
Reply #5 - 12/22/11 at 23:43:17
 
Better make sure you know which axle you're working on.  The Model 15 is generally a 6-cylinder axle and not used in the classic '68 thru '74 AMX's unless you're talking a '77 Hornet AMX which could have the 15.  Most V8 cars are the model 20, easily identified by the perfectly round rear cover without a drain plug.
 
In my experience having done one of each axle type, believe it or don't - the 15 is easier to find parts for. It shares tons of parts with a Dana 35 and since that's a common Jeep axle, parts are readily available.  The model 20 carrier bearing shims are becomming hard to find and somebody once told me that Chevy 10-bolt axle shims work - they do not - they are too small and can possibly jostle around post-assembly.
 
If you don't feel like tackling it yourself, find a reputable shop in your area. I would even go as far as to say go make friends with your Chrysler dealership. Side Story:  When I was rebuilding my Javelin's 20, I didn't have the tools to rebuild the Twin Grip, so I took it to a local, old-timey trans & axle shop. Oh yeah, No problem I was told. 3 Months later where the hell is my Twin Grip? Suffice to say the old fart didn't even bother and stole my bottle of additive I left him in the process for another job. Furious, I took it to my Chrysler Dealer and they said no problem. THE NEXT AFTERNOON they called me to tell me my TG unit was done.  Cost me $250, but I gotta say, that's some darn good service for $250!
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Re: AMC Model 15 Rebuild help
Reply #6 - 12/23/11 at 14:11:16
 
Yeah pretty much decided to go the DIFM route...found a shop and Im gonna pull it and bring it to him...I will renew bushing etc  
Its a 80 AMX w/ a 94 Jeep 4.0L stroked to 4.6L. The rear is a model 15 w/ factory posi.
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