1981 CJ7 GM 151 to 258 Swap - JeepForum.com
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Unread 11-08-2013, 01:08 PM   #1
esalamanca_usmc
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1981 CJ7 GM 151 to 258 Swap

Hey everyone- so my uncle has a bone stock 1981 CJ-7 Laredo w/ the original GM Iron Duke 4 banger. He has had this jeep for about 20 years now- and it's spent the last 6 years or so sitting. Now that he's getting older, he wants to get it back on the road and enjoy the Jeep while he can- (he has 2 knee upcoming knee surgeries this coming year and it's getting hard for him to walk). So he asked for my dad and I to help him work on his jeep, and in turn, later on he'll give me the jeep. So since I'm new to the forum, i figured I'd document everything on a thread.

This past summer he found a whole drivetrain out of a 1985 CJ-7 for a pretty good price- the 258 I6, T176 Tranny [I believe], and a Dana 300. He currently has the GM Iron Duke 4 cylinder, sr4 tranny [i believe], and a Dana 300- so he technically didn't need the t-case, but he picked it all up still bolted together for a sweet deal. He always wanted to do this swap, so we're gonna help him out.
He got a majority of the parts needed I believe- motor mounts, radiator, all the smog lines, wires, etc from the donor jeep. Also, before all of this my uncle got the car smogged and it passed fine w/ the 4 cylinder- so I don't know maybe the motor is worth selling? its pretty low mileage, i'm not sure if anyone looks for these motors though, what do you guys think?


I have 1981 CJ7 Renegade w/ the stock 4.2, so we're basically gonna park them next to the each other and use it as a reference once we start the swap.


I'll try to update this thread as much as possible once we get the ball rolling. If anyone has done this specific swap, any advice or comments would be appreciated!



Here's the fleet: My Uncles CJ on the left, my sister's YJ, and my Renegade on the right


The CJ looking pretty next to the GTO in the car port (where we'll be working on it):


Here's the engine bay:


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Unread 11-08-2013, 03:27 PM   #2
Hilux
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How much are you asking for the engine ? I am looking for that engine for a V8 to 4 cylinder swap .
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Unread 11-08-2013, 03:38 PM   #3
seabass1858
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while its out, Id clean up the engine bay like i did fwiw, Unless you plan on a full frame off restoration. The iron duke is a good motor and the only experience I have with one is in my old crabbing boat believe it or not.
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Unread 11-08-2013, 04:06 PM   #4
esalamanca_usmc
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@Hilux - $200

@seabass1858 - oh yeah definitely will be cleaning out the engine bay. We don't plan on a frame off resto, don't really have that kind of budget. But I've definitely heard good things about the CJ 4 cylinder motors - I just wasn't sure if people preferred the GM 4 cylinder or the AMC 4 cylinders from the CJs. And the iron duke in your crabbing boat- that's sick!
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Unread 11-08-2013, 05:07 PM   #5
strvger01
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i prefer the gm because it has the chevy sb bolt pattern on it. makes it easier to do swaps to the 4.3 v6 or the sb chevy's. it also was used in marine applications that gave the basic block quite a bit more hp.
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Unread 11-08-2013, 05:14 PM   #6
Hilux
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Check your PM please I sent you a message .
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Unread 11-08-2013, 06:00 PM   #7
EgulAye
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It took me a while to figure out, but my CJ came from the factory with the Iron Duke. It's got a straight six and the T150 three speed in it now. The only thing on my Jeep that shows it had the 4 cyl in it originally is the tranny tunnel cover is all chopped up with a second cover scabbed on to get everything closed in properly. Good luck with the swap!
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Unread 11-08-2013, 07:41 PM   #8
titanjeep
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Quote:
Originally Posted by Hilux
How much are you asking for the engine ? I am looking for that engine for a V8 to 4 cylinder swap .
That is not your usual swap, but I can dig it. Are you planning to do any performance mods?
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Unread 11-08-2013, 08:38 PM   #9
Hilux
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Quote:
Originally Posted by titanjeep View Post
That is not your usual swap, but I can dig it. Are you planning to do any performance mods?
I would just leave it stock maybe change out the transmission from the SR4 to a T5 I don't think I want it that stock
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Unread 11-27-2013, 05:47 PM   #10
esalamanca_usmc
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Pressure washed the drivetrain in preparation for the swap. And found out we actually have a NP435 tranny. We thought it was a T18 all along.

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Unread 11-27-2013, 05:55 PM   #11
esalamanca_usmc
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Picked up the clutch kit and some of the other parts. Ready to get this ball rolling.





Also had a chance to run the 66 GTO today.
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