want to rebuild my 4.0, what are my options
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Joined: Nov 2009
Posts: 109
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From: Southern Indiana
Year: 1987
Model: Cherokee
Engine: 4.0
want to rebuild my 4.0, what are my options
I'm wanting to rebuild the motor from the jeep in my signature, it has 340,000 miles on it. My main concerns are longevity, fuel mileage, and low vibration, but I would also like to do some off-roading so a little extra power without sacrificing much mileage would be nice. What kind of aftermarket internals are available for the 4.0? Can I do a stroker using the 4.2 crankshaft and connecting rods without upgrading the fuel system? I read that the HO head in the '91 and newer 4.0s is a lot better than the standard one in my '87, can I swap my head with the HO without modification?
Any help and suggestions would be greatly appreciated. Thanks
Any help and suggestions would be greatly appreciated. Thanks
CF Veteran
Joined: Mar 2010
Posts: 1,275
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From: Alexander City, alabama
Year: 1996
Model: Cherokee
Engine: 4.0 HO
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Joined: Dec 2009
Posts: 139
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From: PA
Year: 1988
Model: Cherokee
Engine: 4.0
put the old amc258 crank and rods in. it will make your 4.0 into a 4.5
http://www.rockcrawler.com/techrepor...er40/index.asp
http://www.rockcrawler.com/techrepor...er40/index.asp
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mtoskippy
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
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Sep 7, 2015 08:56 AM
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