Is this an AMC 20 rear end?

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Hendo2.5
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Is this an AMC 20 rear end?

Post by Hendo2.5 »

Pics attached. I bought an85 j10 for parts and was going to sell it.
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Stuka
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Re: Is this an AMC 20 rear end?

Post by Stuka »

Yup.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ
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HeavyMetalThunder_81
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Re: Is this an AMC 20 rear end?

Post by HeavyMetalThunder_81 »

Sure is.
-Jonny B.
1979 Cherokee Golden Eagle - UNDER CONSTRUCTION
7" lift, 35x12.5x15
AMC 401 - Pro-FLo 4 FI
NV4500/NWFBB/NP205 - Triple Stick'd
F D44 - 4.10, Eaton E-Locker
R M23 - 4.10, Detroit Locker

1979 Cherokee Chief - Parts
1979 Cherokee Chief - Parts
1979 Wagoneer - Sold
1981 Cherokee Chief - Cubed

will e
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Re: Is this an AMC 20 rear end?

Post by will e »

Most defiantly.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

Topic author
Hendo2.5
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Re: Is this an AMC 20 rear end?

Post by Hendo2.5 »

Thanks! Guess I will find out if there is much demand for them.

candymancan
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Re: Is this an AMC 20 rear end?

Post by candymancan »

I think the dana 44 and ford 8.8 are more popular ?
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)

Topic author
Hendo2.5
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Re: Is this an AMC 20 rear end?

Post by Hendo2.5 »

For sure. They are better products.
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Stuka
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Re: Is this an AMC 20 rear end?

Post by Stuka »

The M23 (FSJ M20) is just as strong as a D44. Technically the R&P are quite a bit stronger on the M23. I have some side by side photos of the gear sets if you wanted to see. But in short the M20/23 have an 8.9” ring gear, and the pinion shaft is the same size as a D60.

BUT, the J-Truck version is far too wide for any little Jeep. It’s roughly 8.5” wider than a waggy rear axle. And is wider than a WT Cherokee rear axle.
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ
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fulsizjeep
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Re: Is this an AMC 20 rear end?

Post by fulsizjeep »

Hendo2.5 wrote:For sure. They are better products.
This is debatable. I won't debate it, not worth the time. Just saying it is.
Flint Boardman
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s
https://jubileejeeps.org/quadratrac
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tgreese
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Re: Is this an AMC 20 rear end?

Post by tgreese »

The FSJ Corporate axle (M23) has one-piece shafts (welded on the back side) and heavier tubes than the CJ Corporate axle (M20). Don't let the reputation of the M20 sway your opinion of the M23.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
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