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1973 AMC Javelin 304 auto

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Anthonyfinnegan View Drop Down
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    Posted: Aug/08/2022 at 7:43pm
I've got a 73 Javelin base with 304 motor. I would like to upgrade to bigger engine. Is the 343 and the 360 compatible with the current setup that I have or are modifications needed? (automatic trans)

Edited by Anthonyfinnegan - Aug/08/2022 at 7:45pm
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farna View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/08/2022 at 8:16pm
360, yes -- 343, no. The crankshaft flange changed in 1972 when AMC switched to Chrysler automatic transmission (from 71 and earlier Borg Warner autos). So any 72 and later engine will bolt right in.

304s used a 998, 360s a 727. The 998 will be fine behind a stock to mild 360 if you install a shift kit and maybe a bigger trans cooler. The shift kit (a towing or RV type will work fine) tightens up the shifts and reduces slipping between gears, which will increase the life of the trans as well as make it shift firmer. That's the minimum I'd do (shift kit and bigger cooler). There are other upgrades that can be made to the 998, but all others I know of require rebuilding the trans.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anthonyfinnegan Quote  Post ReplyReply Direct Link To This Post Posted: Aug/08/2022 at 8:26pm
Sounds good thanks!

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