Motor Mount Brackets 2.5 to 4.0 Swap - JeepForum.com

 
LinkBack Thread Tools
post #1 of 6 Old 09-22-2008, 07:16 AM Thread Starter
joemac421
Registered User
 
joemac421's Avatar
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.


Better to have Jeeped & Rolled Over then to never have Rolled Over.
joemac421 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 09-22-2008, 09:20 AM
1TonJoe
Registered User
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
1TonJoe is offline  
post #3 of 6 Old 09-22-2008, 09:23 AM
jeepskate
Web Wheeler
1986 CJ7 
 
Join Date: Aug 2004
Posts: 4,701
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.

'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.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jeepskate is offline  
 
post #4 of 6 Old 09-22-2008, 11:48 AM Thread Starter
joemac421
Registered User
 
joemac421's Avatar
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?

Better to have Jeeped & Rolled Over then to never have Rolled Over.
joemac421 is offline  
post #5 of 6 Old 09-22-2008, 03:00 PM
1TonJoe
Registered User
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
1TonJoe is offline  
post #6 of 6 Old 09-23-2008, 12:18 PM
jeepskate
Web Wheeler
1986 CJ7 
 
Join Date: Aug 2004
Posts: 4,701
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.

'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.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jeepskate is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Is this an old motor mount? Doing v8 swap, and it's in my way Big_Pete1999 Jeep CJ Forum 36 11-22-2009 01:37 PM
V8 swap motor mount question homebrew91 Jeep CJ Forum 3 02-03-2009 10:24 PM
Stock Motor Mount Frame Brackets 243 Jeep CJ Forum 6 02-02-2009 08:41 PM
motor mount engine brackets Andy5150 Jeep CJ Forum 5 11-04-2007 10:25 AM
258 motor mount brackets AMC Power Jeep CJ Forum 2 10-10-2006 10:51 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome