motor swap..now i need some answers!

[76 cj7]

ok so im eyeing a 77 CJ7 with a GM Turbo 400 . thing is it has a bad motor and i have a AMC 258 i6 / 4.2l sittin in my ranch 76 levis cj7 with a manual tranny(which i have no idea what it is).

If you havent guessed what im gonna ask, here goes...will a 4.2 bolt directly to a th400? Moreover what additional parts/work will i need to do for it to "drop" in?

TIA

 

[jeepboy45]

hey 76 CJ7 ,,,

I believe you will not much difficulty doing this.
The TH 400 should bolt up directly to your AMC 258 i6 / 4.2l .
The flexplate should also bolt up to your crankshaft, but I think there might be an issue using a V8 flexplate with your 258. I could be wrong, but I believe you need one for a 258....

Motor mounts will need to be changed though.

I believe fuel lines run down the pass side using a 258 but along the drivers side with a V8. A little re-routing is necessary.

Your post is kinda vague of which Jeep CJ7 your are keeping.

If you're putting the 258 in the CJ with the GM Turbo 400 , then all the shift linkage is already there, with the correct column.

If going the other way, you'll need all the linkage, and the column from the auto jeep to put in your current stick jeep. It will be much easier to take the 258 and put it in the jeep currently set up with the TH400

Good luck, sounds like a fun project..
brian

 

[76 cj7]

sorry, im keeping both but the rach CJ is the donor and the other is a city slicker! ima rebuild the V8 and pt it in the ranch CJ later

 

[jeepboy45]

Good...
If I read it right, you're putting the AMC 258 i6 / 4.2l in the CJ with the GM Turbo 400 ..

That sounds like the much easier conversion to me...

Flexplate, and fuel lines sound like the major issues to me.

I dont think you'll have any electrical issues either. At least none come to mind. And if the V8 CJ radiator is good, it will surely keep the 258 cool !

 

[76 cj7]

Good...
If I read it right, you're putting the 258 in the CJ with the TH400..

That sounds like the much easier conversion to me...

Flexplate, and fuel lines sound like the major issues to me.

I dont think you'll have any electrical issues either. At least none come to mind. And if the V8 CJ radiator is good, it will surely keep the 258 cool !

cool cool. how many manual 3 spds came on the 76 CJ7 levis?

 

[jeepboy45]

cool cool. how many manual 3 spds came on the 76 cj7 levis?

I couldnt even begin to tell you that.

Remember to get a AMC 258 i6 / 4.2l flexplate to use... I dont think the V8 flexplate will work for you.

 

[76 cj7]

I couldnt even begin to tell you that.

Remember to get a 258 flexplate to use... I dont think the V8 flexplate will work for you.

who would you recommend that i pick that up from? I was guessing carquest

 

[jeepboy45]

who would you recommend that i pick that up from? I was guessing carquest

I'd start with Craigslist, then ebay...
Oh, www.car-parts.com is a good source of all salvage yards...
Save that link, you'll need it in the future !!

Wish I could help more.

 

[76 cj7]

Lol well that jeep with a blown motor sold shortly after I started this thread. Guess I'm gonna havw to restore my Levis edition