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Unread 09-22-2008, 07:16 AM   #1
joemac421
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1986 CJ7 
 
Join Date: Dec 2005
Location: Coventry, RI
Posts: 226
Motor Mount Brackets 2.5 to 4.0 Swap

I know I need new motor mounts to do this swap, but the motor mount brackets are bolted through the frame. Can I just drill new holes and move the existing brackets? I would think I would have to do something for the strength of the frame. Please Help.

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Unread 09-22-2008, 09:20 AM   #2
1TonJoe
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1992 YJ Wrangler 
 
Join Date: Sep 2008
Location: Ohio
Posts: 4
Bracket Swap

I just did a similar swap. I replaced my 92 4.0 frame with a 91 2.5 frame. I measured the distance from shock towers to the leading edges of the motor mount brackets on the 4.0 frame. Using a cut_off wheel and grinder, I removed the frame brackets on the 2.5 frame. I welded new 4.0 brackets, from chrysler dealer, onto the 2.5 frame. I REUSED THE ACTUAL MOTOR MOUNTS but I started with a 4.0. You may need new mounts. I also kept my AX15 so I did not have to do anything with the trans mount. Let me know if you need the shock tower to bracket measurements and I'll get the measurements tonight. I think it was like 1" driverside and 3" passengerside. Mine bolted right up~ no problems.
GOOD LUCK! - Joe
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Unread 09-22-2008, 09:23 AM   #3
jeepskate
Web Wheeler
1986 CJ7 
 
Join Date: Aug 2004
Posts: 4,700
This is the CJ forum...he doesn't need to go through all of that on a CJ. Pick up a set of brackets off of a '76-'86 CJ that had the 258...they bolt right up to your frame and to the 4.0...the block is nearly identical to the 258/4.2. You can also use aftermarket mounts like MORE Bombproofs. I've done this a couple of times as have many others.
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'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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Unread 09-22-2008, 11:48 AM   #4
joemac421
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1986 CJ7 
 
Join Date: Dec 2005
Location: Coventry, RI
Posts: 226
Jeepskate, I got that, but Do I have to redrill the frame or are the brackets offset? I thought that I had to move them or at least one on the pass. side?
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Unread 09-22-2008, 03:00 PM   #5
1TonJoe
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1992 YJ Wrangler 
 
Join Date: Sep 2008
Location: Ohio
Posts: 4
Cj~yj

Sorry guys, didn't realize I was in CJ Tech! Good Luck!!!!!!!!!
Joe
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Unread 09-23-2008, 12:18 PM   #6
jeepskate
Web Wheeler
1986 CJ7 
 
Join Date: Aug 2004
Posts: 4,700
I'm 99% certain that you don't need to redrill the frame...should mate up properly between the holes that are already there and the way the brackets sit.
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'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
http://www.jeepskate.net
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