motor mount location for 2.5 to 4.3 swap - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-20-2009, 09:58 PM Thread Starter
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motor mount location for 2.5 to 4.3 swap

i have an 87 wrangler yj i am swapping the 2.5 for the 4.3. i would like to know if i have to move the motor mounts.and if so what is the measurement of this move.also wondering if i should go manual or auto??
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post #2 of (permalink) Old 02-21-2009, 05:50 AM
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Welcome to the board! I can't help with the motor mount move, but can with the transmission question. Short answer: Yes.

We've kicked that around many times, and the answer seems to be that it's mainly a matter of personal preference. Personally, I can't imagine how an auto could hold a candle to a stick in tight, technical crawling.

I've watched auto Jeeps getting over rocks and logs, and when the tires first encounter an obstacle they stop. More power is fed in until they finally start to crawl up. Then the tires get over the top and the Jeep leaps forward. It just looks messy and hard to control, but lots of guys have autos and in the end, go everywhere a similar stick Jeep can go.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #3 of (permalink) Old 02-22-2009, 07:03 PM Thread Starter
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thank you for your reply

thank you for your reply. i am now leaning back toward the manual tranny, my only question with that is can i take the bell housing off of my jeep tranny and swap it out for a chevy bell houseing? that would save me a lot of money. i am on a verry limited to cheap budget.
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post #4 of (permalink) Old 02-22-2009, 07:40 PM
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Smile motor swap info

ok dont know what trans you are planing on using behind the chevy v6 4.3 but take a look at the cj8 scrambler pic way back when i started the rebuild.......... it had the pont iron duke motor 4 cyl in it and the bellhousing was a match for both the 4.3 and chevy sb v8.............. dont think the jeep one will work......... but their are plenty of chevy bellhousing in the junk yards and all the chevy v8 and 4.3 v6 in the years up too about mid 90,s should interchange............ but why 4.3 why not go the chevy sb motor............ as for the motor mounts you can see the ones i used are from trans adapt and they bolt up using the holes in the jeep frame.......... no drilling they make all the parts pcs you will need for either the 4.3 or a v8 chevy.... hope this helps some.......
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post #5 of (permalink) Old 02-22-2009, 10:21 PM Thread Starter
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gas money

id have to say gas money is the reason for the v6. and weight for the v8. i do mostly mud riding and some rough trail rides.....i looked on my frame for bolt holes to mount the new mounting points. unfrotunatly there are none there. i also went with the v6 so i wouldnt have to move the mounts or so i thought. it is the same length as the 2.5 i already have. where its different is its wider, but not wide enough i need to shim out from the motor to the mounts.truely i wont know the measurement untill i get my trans problem solved. i was tryin to jump ahead to have something to do....
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post #6 of (permalink) Old 02-26-2009, 01:50 PM
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Based on the info on Novaks site regarding the GM 90* blocks to AX-15 tranny, you might be better off money/fab time wise scoring a 4.3L w/ NV3550 or 700R4 out of a S-10/Blazer/Astro.

Novak also covers the motor mounts, but I understand the concept of more time than $$... if you need to build them yourself.

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