frankthetank07 Posted June 9, 2008 Share Posted June 9, 2008 Hey has anyone done a 4.2 to 2.8 swap in a 1986 4x4 Jeep comanche with the 5 spd tranny? Any help would be great, my friend said he'd give me the engine with carb for free and hopefully I could take advantage of this opportunity without too many modifications to the firewall. any advice or thinks to look for would be great. thanks, frankthetank07 Link to comment Share on other sites More sharing options...
JeepcoMJ Posted June 9, 2008 Share Posted June 9, 2008 Hey has anyone done a 4.2 to 2.8 swap in a 1986 4x4 Jeep comanche with the 5 spd tranny? Any help would be great, my friend said he'd give me the engine with carb for free and hopefully I could take advantage of this opportunity without too many modifications to the firewall. any advice or thinks to look for would be great. thanks, frankthetank07 no, you'd be doing the same amount of work that you'd need to do to put a 4.0 in. the transmission from your 2.8 won't bolt up to the 4.2 much less hold the power. motor mounts won't work, and the header needs swapped out to 4.0 rad support plus altering firewall to fit and building exhaust. get a 4.0. they're cheap. Link to comment Share on other sites More sharing options...
SuperWade2 Posted June 9, 2008 Share Posted June 9, 2008 Take the "FREE" 4.2, Sell it, use the money to buy a 4.0 = Still Free... Link to comment Share on other sites More sharing options...
Geonovast Posted June 9, 2008 Share Posted June 9, 2008 Take the "FREE" 4.2, Sell it, use the money to buy a 4.0 = Still Free... BETTER. Get the Free 4.2, get a 4.0, and build a 4.5. Link to comment Share on other sites More sharing options...
Pete M Posted June 9, 2008 Share Posted June 9, 2008 Take the "FREE" 4.2, Sell it, use the money to buy a 4.0 = Still Free... BETTER. Get the Free 4.2, get a 4.0, and build a 4.5. And kiss the rest of the truck's drivetrain goodbye. :D Link to comment Share on other sites More sharing options...
FxRacing282 Posted June 10, 2008 Share Posted June 10, 2008 Link to comment Share on other sites More sharing options...
Geonovast Posted June 10, 2008 Share Posted June 10, 2008 Take the "FREE" 4.2, Sell it, use the money to buy a 4.0 = Still Free... BETTER. Get the Free 4.2, get a 4.0, and build a 4.5. And kiss the rest of the truck's drivetrain goodbye. :D He's going from a 2.8 so he's gotta get a new tranny anyway... This is just my opinion, but it would be totally worth it. Link to comment Share on other sites More sharing options...
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