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Old 07-05-2022, 12:18 PM
cabz cabz is offline
232 I6
 
Join Date: Apr 06, 2005
Location: Ocala Florida
Posts: 102
4.2 to 5.9 engine mounts and engine placement

Hello.
I have an 81 i10 that used to be a 4.2 4spd truck.
It was hacked into a 5.9 4spd and I mean hacked.

My question is I want to correct the hack and go 5.9 727.

Do I have to change the frame mount brackets for the 5.9?

And what holes/ do i use to mount the trans crossmember?
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Old 07-06-2022, 10:27 AM
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tgreese tgreese is offline
 
Join Date: May 29, 2003
Location: Medford MA USA
Posts: 11,605
Quote:
Originally Posted by cabz
Hello.
I have an 81 i10 that used to be a 4.2 4spd truck.
It was hacked into a 5.9 4spd and I mean hacked.

My question is I want to correct the hack and go 5.9 727.

Do I have to change the frame mount brackets for the 5.9?

And what holes/ do i use to mount the trans crossmember?
Have you located a donor for the 360/A727? I would just copy what I found in the donor. There are many differences between the I6 and V8 vehicles - this has been covered a lot in previous post on this forum. You can search with Google or other online search engines and find plenty of reference material.
https://www.bing.com/search?q=site%3...360+conversion

There are parts books on the Tom Collins sites that will confirm the difference in the frame towers for the 6 and V8. Again, find a donor for what you need online with a site like car-part.com, or advertise in the WTB forums here and at other Jeep sites. You could also look for parts cars in the for-sale forum here and at other Jeep forums.
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Old 07-06-2022, 07:23 PM
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backroadin' backroadin' is offline
350 Buick
 
Join Date: Aug 11, 2004
Location: Vermont
Posts: 1,099
Did the hacker change the frame mounts? If not, the correct v8 frame horns will be different - yes.

Not sure on the frame holes for the tranny x-member, but if you mock it up it should be obvious. My guess would be the rear ones since the auto tranny is longer, but it really depends on where the mount mounts on it. If you're changing / welding in new frame horns, then you can position them to use whatever set of holes you need to.

Good luck with the project!
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