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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > 4.0 to 4.7 swap, ins and outs!

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Unread 09-16-2013, 06:34 PM   #1
Clarkweant
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Join Date: Sep 2013
Location: Sarasota, Florida
Posts: 2
4.0 to 4.7 swap, ins and outs!

So I have my 98 zj 4.0 with 225000 miles an it just crapped out on me, I got a knock in the motor an just drove it til it gave out. Ended with a nice bunch of clunking sounds in the motor, my guess a rod or piston,

I found a 4.7 stroker kit on 505performance an I need to know what else needs to be done besides the block bored an strokes by a machine shop, different intake manifold? Any computer changes?

Thanks for any help!!! Much needed!

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Unread 09-16-2013, 07:05 PM   #2
KyBoy1991
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1998 ZJ 
 
Join Date: Apr 2008
Location: Louisville, Kentucky
Posts: 666
You're best off talking to the 505Performance folks. They have complete swaps you can do, or they can have theirs built to the point you bolt your leftover undamaged parts up. It's all about $$$$

I have looked at their kits, and best I could tell, they're designed for you to use with your good block. I'd say you may be in trouble if you snapped a piston or rod in a chamber.

Most of their kits are new upgraded parts with coatings vs. what many guys scavenge from the old 4.2 inline six motors and do the cheap stroker builds.

With zero machining (best I can remember) I can build a stroker with parts from a 4.2 for just the cost of that old motor. If its free, them I'm building a stroker for free. But we all know nothing is free when working with jeeps or motors...and especially jeep motors.

Do some searching on here, unless you're just wanting to but the built block from them. I'd still spend the time on the phone with them to answer all the questions you have before you purchase. You're most likely looking at a $4600 investment.

Good luck
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Unread 09-17-2013, 09:09 AM   #3
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 16,237
Better beef up the transmission. A 42RE won't last long behind a stroker.
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Unread 09-18-2013, 12:38 PM   #4
Clarkweant
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Join Date: Sep 2013
Location: Sarasota, Florida
Posts: 2
Thanks guys, ya I am building the transmission also, it has been rebuilt once but I'm doing it again myself to ensure that it is done right this time, I'll be sure to give the guys at 505 performance a call! Thanks for all the info
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