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The only difference that I know of is the presence or absence of a thin bushing needed to support the nose of the TH400 torque convertor. The AMC cars all used the Chrysler transmissions and the crankshaft is sized to fit the larger nose of the Chrysler transmissions. Bushing or not, should not matter for a manual transmission application.
I would be surprised if there are any new AMC 360 crankshafts available, other than aftermarket forged steel stroker crankshafts priced in the thousands of dollars. The original crankshafts for the 304 and 360 are cast iron, typical of most such crankshafts. If you need a replacement crankshaft, it will be reconditioned, not new. A crank kit will come with the reconditioned crankshaft and bearings sized to work with the resized journals. Usually you get a crank in exchange that is one size under the core you supply. Ie, if you turn in a virgin crank, the crank you get back will will have 10-thou undersized journals with matching bearings. Turn in a 10-under core and get back a 20-under replacement, etc. Ask your local automotive machine shop about this.
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
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
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