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Help Identify gears |
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RamblinAMC 
AMC Nut 
Joined: Dec/07/2008 Location: Clovis,Ca Status: Offline Points: 264 |
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 Topic: Help Identify gearsPosted: Mar/26/2017 at 1:12pm |
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I need some help identifying the gears and type of differential in this model 20 rear end. Supposedly came out of a 71 V8 Gremlin. Measures 58 1/2" wms to wms.
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1963 Rambler American 330
1971 Hurst Jeepster 1972 Commando 4.0 1972 Commando 258 1975 Jeep J20 401 |
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Lyle
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Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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Posted: Mar/26/2017 at 3:21pm |
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The numbers shown are not part numbers that line up to the TSM I have so they may be aftermarket. Drain the oil and count the teeth. By the picture I'm guessing 39 on the ring so AM20 had pinions 10 and 11 for this with resulting 3.91:1 and 3.54:1 in 1971.
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farna
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Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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Posted: Mar/27/2017 at 6:54am |
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If there is a fill plug on the rear cover it's an AMC 15. If the fill plug is in the casting in front, next to where the pinion shaft comes out, it's an AMC 20. Standard diff, not limited slip (posi). As styated -- count the teeth on the pinion gear and the ring gear. Divide pinion into ring to get the number, round to two decimal places (39/10 = 3.90).
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Frank Swygert
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Lyle
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Posted: Mar/27/2017 at 7:50am |
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frana is absolutely correct on the math and I don't understand it either but AMC lists there 39/10 as a 3.91:1. Go figure, maybe they rounded 0 up or just a typo in everything.
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Sonic Silver
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Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
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Posted: Mar/27/2017 at 11:19am |
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RamblinAMC
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Joined: Dec/07/2008 Location: Clovis,Ca Status: Offline Points: 264 |
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Posted: Mar/27/2017 at 4:12pm |
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41/10 so 4.10 gears. It is a model 20. Diff appears open but both drums turn the same direction.
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1963 Rambler American 330
1971 Hurst Jeepster 1972 Commando 4.0 1972 Commando 258 1975 Jeep J20 401 |
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tufcj
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Posted: Mar/27/2017 at 4:39pm |
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Definitely an open diff. With no load they will both spin. Hold one axle and the other will still spin with little effort.
Bob tufcj |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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purple72Gremlin
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Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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Posted: Mar/27/2017 at 5:18pm |
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AMC didnt make a V8 Gremlin until 1972. possibly this came out of a V8 hornet...if it is a 1971.
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RamblinAMC
AMC Nut
Joined: Dec/07/2008 Location: Clovis,Ca Status: Offline Points: 264 |
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Posted: Mar/28/2017 at 9:00am |
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This was a 1971 Gremlin that was a dealer sponsored drag car back in the late 70's. It sat by a barn for a long time till a friend of mine purchased it and restored it. We traded rear ends as he wanted a higher geared and non posi rear axle for a street car.
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1963 Rambler American 330
1971 Hurst Jeepster 1972 Commando 4.0 1972 Commando 258 1975 Jeep J20 401 |
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Lyle wrote: