Cranks 5.9 360 Difference

[Tanker]

Is there a difference between them???? Pilot bushing??

[tgreese]

The '71 crankshafts are definitely different with a different flange meant for the Borg-Warner automatics used in the AMC cars that year. I believe the 304-360 cranks were all the same from then on. Jeep specifies a different number for the manual versus TH400 for some years. I suspect this is because these cranks came as a kit with mains. Likely the torque convertor bushing came installed, if meant for the TH400.

The '81-86 book specifies the same kit that was supplied for manual transmissions '74-80, PN 8125451. The '86-88 book gives a new part number. This would be the era of the "5.9" - maybe they were marked differently? There may be a casting number reference somewhere online.

The AMC forum says they are all the same. https://theamcforum.com/forum/304-vs-36 ... page1.html If that's not definite enough you could ask someone like SC397 that builds a lot of these engines, there or at IFSJA.

[Stuka]

As the question was a bit vague, what tgreese notes above is true for the AMC 5.9L. Which has no relation to a Chrysler 5.9L, or a Ford 5.9L. I am sure the OP knows this, but for anybody that finds this post down the road, this should make the post a bit less ambiguous.

[Tanker]

Sorry on the vague I'm selling some motors a few are the 5.9 type and some 360... I just want to make sure that to a degree that there the same.... As to other 360s all motors I have are SJ...

[tgreese]

To be even less vague ... and support any future readers:

Chrysler took over Jeep in 1987, and by this time the only vehicles that used the AMC V8 were the "Grand" Wagoneer and the J-series pickups. Chrysler promptly discontinued the J-series trucks. I believe it was then they started calling the AMC 360 a 5.9L. I have seen blocks where the letters in the block casting were changed to "5.9L" instead of "360" and it seems plausible they changed the crank markings to distinguish the new naming scheme, thus a new part number. AFAIK the 5.9L is exactly the same engine; just renamed.

Why? Maybe to wipe out all vestiges of AMC heritage? To make the appearance of modernization? Who knows. A distinction without a difference. If anybody here knows more, please advise.

A liter is almost exactly 61 cubic inches (61.023744 ... even this is rounded off). The AMC 360 is actually 359.7979 cid which is 5.896 liters. All three "360s" have different bores and strokes and different actual displacements. Dodge 360: 359.9009, Ford 360: 360.7098 cid. Different - nothing interchanges, except maybe lifters between AMC and Dodge.

[Stuka]

A liter is almost exactly 61 cubic inches (61.023744 ... even this is rounded off). The AMC 360 is actually 359.7979 cid which is 5.896 liters. All three "360s" have different bores and strokes and different actual displacements. Dodge 360: 359.9009, Ford 360: 360.7098 cid. Different - nothing interchanges, except maybe lifters between AMC and Dodge.

Yeah, the 'Magnum' 360 uses the AMC V8's lifter/rocker design. I forget what year Chrysler adopted that.

But to the OP, as far as I know the only differences between the two AMC V8 designations are external, like the starter motor and such. And even then, I think maybe the mini started was used on some late '360' designated engines.