Help with swap please -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > General Technical Discussions > Engines & Drivetrain > Help with swap please

Jeep Wrangler Bushwacker Flat Fender Flare Sale at BaselinIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed LineIncome tax season is upon us. We got what u need

Unread 10-26-2012, 07:26 AM   #1
Registered User
Join Date: Sep 2012
Posts: 2
Help with swap please

I am swapping a 5.7,700r4 with a np241 trans case into a 91 yj. I set the motor about 2.5" from the firewall. Now it looks like my rear drive shaft is only going to be less than a foot long. My question is when I lower the trans and transfer case to get the drive shaft straight the motor will be on an angle will it be ok? Thanks for any advice.

lennyj71 is offline   Reply With Quote Quick reply to this message
Unread 10-26-2012, 11:23 AM   #2
Registered User
1988 YJ Wrangler 
Join Date: Jan 2011
Location: Mechanicsburg, PA
Posts: 564
If you haven't already welded in your motor mounts do yourself a favor and get the cradle mount. I normally wouldn't suggest it but it seems to work best for the longer auto transmissions like the 700r4. The cradle mount seems to bring the motor forward which is a pain when it comes to installing a fan but it will give you a longer driveshaft. A driveshaft less than 12" will not be useable and would eat through u-joints if it was.

Another option is to cut , move, and reweld your motor mounts (assuming you've already welded them in place) and move them forward. Moving them down will help as well but too much could cause a collision between the oil pan and front axle from any major articulation. Also keep in mind that you want a good amount of the motor mount to be mated to the frame to ensure a solid/sturdy weld.

The motor being on an angle isn't terrible assuming the angle is not too extreme. If you are running a carbureted motor then the angle WILL matter. Fuel injection won't be affected by driveline angle. Any motor placed on an extreme angle could cause oiling problems so keep that in mind too.
WhyJayPA is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.