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Wanted: 1979 258 Crankshaft
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Sidney1921 View Drop Down
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Joined: Sep/10/2017
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sidney1921 Quote  Post ReplyReply Direct Link To This Post Topic: Wanted: 1979 258 Crankshaft
    Posted: Sep/16/2017 at 10:08pm
I am looking to rebuild the bottom end of my 79 258. Anybody know the best place to find a decent used or after-market c rank that matches the specs? I specify the year since AMC went to a lighter crank with fewer counterbalances in 81. I have an 83 crank that will drop in but I would prefer to match the pistons and etc. with the original weighted crank to avoid any possibilities of vibration issues. I'm trying to avoid an expensive heartbreak. I am assuming that any crank between 75 and 79 would be safe bets. Other suggestions?
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DaemonForce View Drop Down
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Points: 1070 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaemonForce Quote  Post ReplyReply Direct Link To This Post Posted: Sep/17/2017 at 9:44am
Couldn't you simply remachine the existing crank?
1971 Javelin SST
American 304 2v | FMX | AM20-3.31
1983 American Limited
Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72
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AMXRWB View Drop Down
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Points: 1154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXRWB Quote  Post ReplyReply Direct Link To This Post Posted: Sep/17/2017 at 10:21am
You can buy them done and ready to go or rebuild you own.
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Sidney1921 View Drop Down
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sidney1921 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/17/2017 at 2:21pm
The 79 crank is junk. All of the journals are badly scored and beyond repair.
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232jav3sp View Drop Down
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Points: 2451 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 232jav3sp Quote  Post ReplyReply Direct Link To This Post Posted: Sep/17/2017 at 7:08pm
I have two 12 counterweight cranks.  Both are in good condition.  Still wouldn't hurt to have them cleaned up.  
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