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Unread 01-01-2012, 12:39 PM   #1
tarheelboy
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1985 CJ7 
 
Join Date: Apr 2008
Location: Rutherfordton, NC
Posts: 13
Motor Swap

I currently have an 85 CJ7 with a 304, I want to swap back to a 258. The previous owner put the 304, and I don't want anything to do with the motor. It has a 3 speed tranny. Can I stick with the 3 speed? What else would I need to switch out and far as the drive train? The only reason for the swap other than I don't like the 304, is the 304 needs a rebuild.

Any help would be much appreciated.

Thanks

Ashley

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Unread 01-01-2012, 01:08 PM   #2
79indcj7
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1979 CJ7 
 
Join Date: Mar 2011
Location: INDY, INDIANA
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Pretty sure 3 spd will work. However i think u will have to move the motor mounts on the frame because the 6 is longer.
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Unread 01-01-2012, 01:21 PM   #3
mopar408
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1974 CJ5 
 
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flywheels are different.....
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Unread 01-01-2012, 01:29 PM   #4
hutch1200
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1979 CJ7 
 
Join Date: Feb 2007
Location: , Pa
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Motor mount to frame is different on passenger side. I have a freshly powdercoated 1 if you want it. Do you have a 258 also? If not, you know to get every part ya can off it. Balncer to flywheel. T-150 trans will bolt up.

BTW Mopar408...any relation to Mopar346?
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Unread 01-01-2012, 01:36 PM   #5
arkiemurph
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1985 CJ7 
 
Join Date: Jun 2006
Location: Arkansas
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Here's the sticky thread on swapping FROM a 258 to a 304 or other AMC V8.

http://www.jeepforum.com/forum/f8/of...thread-377983/

Unless you're set on a 258, you may want to look for a 360. They're pretty common cause they were in a lot of the old full size Jeeps like Wagoneers and Jeep pickups. It would also be easier since your already set up for an AMC V8.

Murph
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Unread 01-01-2012, 04:43 PM   #6
tarheelboy
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1985 CJ7 
 
Join Date: Apr 2008
Location: Rutherfordton, NC
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Thanks for all the help. Yes I am in the market for a 258, and pretty dead set on it. I had a CJ5 before this one with the 258, and it was a beast. I dang near melted the motor from a fire and it cranked right back up and ran fine. So I am sold on those motors. I don't think it will be a hard swap, but it will be interesting.
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Unread 01-01-2012, 05:35 PM   #7
arkiemurph
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1985 CJ7 
 
Join Date: Jun 2006
Location: Arkansas
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It won't be hard. Like said, you'll need one motor mount, swap ur gas line to the pass side, redo ur exhaust. I'm thinking that's about it. One plus is you'll have a lot more room to tinker around in your engine compartment!

M
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Unread 01-08-2012, 05:15 AM   #8
sequoia123
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Question, I have a 1974 cj5 and the 304 just went kaput ,needs a rebuild.. Would really like something w/ better gas mileage, and a somewhat painless swap would be nice too. what would be the easiest swap for me ,besides a 304 or 360. I am a welder so a mount or two wont be a problem. does anything bolt right up to the original 3 speed tranny? I think its the T15.
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Unread 01-08-2012, 06:01 AM   #9
arkiemurph
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Quote:
Originally Posted by sequoia123 View Post
Question, I have a 1974 cj5 and the 304 just went kaput ,needs a rebuild.. Would really like something w/ better gas mileage, and a somewhat painless swap would be nice too. what would be the easiest swap for me ,besides a 304 or 360. I am a welder so a mount or two wont be a problem. does anything bolt right up to the original 3 speed tranny? I think its the T15.
Read the link I posted above. Good luck with mpg's! Fuel injection seems to help the most. Also make sure u run the right gears for ur tire size. Don't run 36's with 3.31 gears like some jackwagons do thatncant afford a gear swap and isn't smart enough to do it himself.

Murph

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