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post #1 of 12 Old 05-18-2008, 09:08 PM Thread Starter
joemadoo
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Engine swap question

I'm getting ready to tear down the 5.2L engine in my 97 GC because of broken main bearings. I'm curious how hard it would be to convert the 5.2L to a 5.9L. Could I get away with just swapping out a rebuilt 5.9 block or is there more to it than that...

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post #2 of 12 Old 05-18-2008, 09:12 PM
nashmd454
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you can send a pm to five niner or 5.9Andy....both are very knowledgable with 9's. I am under the impression you would also need a different tranny and so forth.

96' JGC V-8 5.2L ltd.
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post #3 of 12 Old 05-18-2008, 10:21 PM
jeepheller98
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yes the 5.9 came with a diffrent but stronger tranny

98 ZJ 3" lift homemade snorkel. JKS quicker disco 5.2L 150,000, 31x10.5 pro comp muds
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post #4 of 12 Old 05-19-2008, 06:50 AM
Windowsrookie
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You would also need a new computer.

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post #5 of 12 Old 05-19-2008, 09:15 AM
HighLonesome
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Originally Posted by Windowsrookie View Post
You would also need a new computer.
Not true. But yea to squeeze out every last HP you will need a PCM flash.

My 95 with a stock 5.9 from a 98 GC and STOCK 95 PCM runs like a Swiss clock. Jumps off the line and pulls hard to redline. And I got 16pmg on mixed driving last tank including a slow jaunt in the mtns.
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post #6 of 12 Old 05-19-2008, 09:18 AM
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Quote:
Originally Posted by joemadoo View Post
Could I get away with just swapping out a rebuilt 5.9 block or is there more to it than that...
Its that simple. You just need a the 5.9 flexplate and harmonic balancer because the 5.2 is internally balanced and the 5.9 is externally balanced. I have a spare 5.9 balancer and flexplate I will sell pretty cheap.
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post #7 of 12 Old 05-19-2008, 10:02 AM Thread Starter
joemadoo
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OK so I can keep the 5.2 ECU but do I need the 5.9 tranny or can i keep the 5.2 tranny. I really dont want to get rid of it because it was just rebuilt.
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post #8 of 12 Old 05-19-2008, 10:24 AM
HighLonesome
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You can keep the 44RE tranny. How long it will hold up to the extra torque is anyone's guess.
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post #9 of 12 Old 05-19-2008, 12:09 PM Thread Starter
joemadoo
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Well its only a couple thousand miles old. So it sounds like all I need is a short block, harmonic balancer, and a flexplate. Now i just gotta find the 5.9 block.
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post #10 of 12 Old 05-19-2008, 12:26 PM
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Quote:
Originally Posted by joemadoo View Post
Well its only a couple thousand miles old. So it sounds like all I need is a short block, harmonic balancer, and a flexplate. Now i just gotta find the 5.9 block.
Exactly.

Good chance your old heads are cracked tho.
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post #11 of 12 Old 05-19-2008, 12:40 PM
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i have a 5.9 long block, but it will need a rebuild.

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its comments like this that make me wonder why some people are jerks.

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post #12 of 12 Old 05-22-2008, 07:35 AM
HighLonesome
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Quote:
Originally Posted by five.nein View Post
Its that simple. You just need a the 5.9 flexplate and harmonic balancer because the 5.2 is internally balanced and the 5.9 is externally balanced. I have a spare 5.9 balancer and flexplate I will sell pretty cheap.
Here's a pic of the balancer
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