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Old 12-05-2010, 01:39 PM   #1 (permalink)
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engine swap

I have a 1978 jeep j-10 pickup with a 258 straight six in it. It has a 3 speed manual tranny that I believe is a t-15 with what I think is a dana 20 transfer case also. If this is wrong let me know, I'm new to the 4x4 world. My question is this, the old six cylinder is getting old and under powered. I found a mid 80's 350 chevy turn key motor out of a suburbon that has everything including motor mounts with it that I would like to install. It comes with a automatic tranny that won't work because its 2 wheel drive. What would it take to install this in my truck. Would it be easyer and cheeper to use my existing drive train with adapter plates or get a 4 wheel drive turbo 350. Will that bolt to my transfer case? Any help would be appreciated thank you, j-1078.
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Old 12-05-2010, 01:41 PM   #2 (permalink)
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Old 12-05-2010, 02:39 PM   #3 (permalink)
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You could EASILY find a 4wd 700r4 and NP241 tcase (drivers or passengers side drop, they made both) at a "Pull it yourself" junkyard for less than $200 if you have one near you.
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Old 12-05-2010, 03:05 PM   #4 (permalink)
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Will that fit my driveshafts, in lenth and u-joint fitment? Or will I have to modify them?
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Old 12-05-2010, 03:24 PM   #5 (permalink)
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Will that fit my driveshafts, in lenth and u-joint fitment? Or will I have to modify them?
if you change the entire drivetrain, of course you will have to re-work the driveshafts. you could adapt at the bellhousing and keep the old gay 3spd if you're that challenged for cash or talent
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Old 12-05-2010, 05:47 PM   #6 (permalink)
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No issues with talent just trying to figure out everything I'll need and what and how much I'll need to modify or fab to make it fit. Is there a big differnce in the overall length of transmissons and tranferrcases or are we talking a inch or 2? also what other issues do I need to consider? Will that radiator cool the 350 or will I need to get a bigger one. I know I'll need a trans cooler, what else might I need that is comomly over looked on a job like this?
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Old 12-05-2010, 05:51 PM   #7 (permalink)
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Old 12-06-2010, 01:44 PM   #8 (permalink)
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What type and what years of vehicales would be best to find thesse in? I need the transfer case to go to the passanger side ( if that makes a difference in what vehiceles to look for) . Thanks for the help j-1078.
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Old 12-06-2010, 07:45 PM   #9 (permalink)
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You'll need a bigger radiator. Take some measurements and go to the salvage yard. Since you wont have much width/height to work with you'll need a thick rad. You'll need a shroud too. I'm a fan of mechanical fans, but you may not have enough room so you could also fine a elec. fan at the salvage.

Other things to consider: Motor mounts, tranny x-member, exhaust, Tunnel clearance.
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Old 12-06-2010, 07:52 PM   #10 (permalink)
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Thanks, I was planning on useing the motor mounts from the suburbon the motor is from and my crossmember and modifying them to fit if possible. As for the radiator I'll look for one from a v-8 j-sereis or a wagoneer if I can find one.
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Old 12-06-2010, 08:25 PM   #11 (permalink)
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Thanks, I was planning on useing the motor mounts from the suburbon the motor is from and my crossmember and modifying them to fit if possible. As for the radiator I'll look for one from a v-8 j-sereis or a wagoneer if I can find one.
Not gonna work. You need a Chevy or conversion radiator...the hoses line up opposite.
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Old 12-06-2010, 08:28 PM   #12 (permalink)
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Thanks, I was planning on useing the motor mounts from the suburbon the motor is from and my crossmember and modifying them to fit if possible. As for the radiator I'll look for one from a v-8 j-sereis or a wagoneer if I can find one.
I used a V8 Gand Cherokee radiator in my XJ. The lines will work on it. Have not ran it yet so I cant say how well it cools.
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Old 12-07-2010, 02:22 PM   #13 (permalink)
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If you pull the drivetrain from a solid axle GM truck it will have a passenger side drop t-case. I would personally just swap in an AMC 360 or 401 easier to do since it's still Jeep.

Check out www.ifsja.org International Full Size Jeep Association. Devoted to any and all full size jeeps, lots of good information. Also I would not post in the Hardcore section anymore unless you like being flamed. Nothing about this is hardcore.

Not sure why I feel like being nice today, and people have been taking it very easy on you, get out to the newbie section while you still can.
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Old 12-07-2010, 03:21 PM   #14 (permalink)
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Originally Posted by j-1078 View Post
I have a 1978 jeep j-10 pickup with a 258 straight six in it. It has a 3 speed manual tranny that I believe is a t-15 with what I think is a dana 20 transfer case also. If this is wrong let me know, I'm new to the 4x4 world. My question is this, the old six cylinder is getting old and under powered. I found a mid 80's 350 chevy turn key motor out of a suburbon that has everything including motor mounts with it that I would like to install. It comes with a automatic tranny that won't work because its 2 wheel drive. What would it take to install this in my truck. Would it be easyer and cheeper to use my existing drive train with adapter plates or get a 4 wheel drive turbo 350. Will that bolt to my transfer case? Any help would be appreciated thank you, j-1078.

Have you done anything with the carb or the ignition timing on your 258?

Bet you can find a V8 powered j-truck for less than your swap plans will cost.
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Old 12-07-2010, 03:39 PM   #15 (permalink)
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Have you done anything with the carb or the ignition timing on your 258?

Bet you can find a V8 powered j-truck for less than your swap plans will cost.
I bet he could find all the information he needs without asking a single questions as well. Yet he still has a bunch of threads in different sections asking the same questions.

I take back being nice after I looked about all of the threads he started.
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