Dana 20 for a Dana18 with overdrive - Off-Road Forums & Discussion Groups
Jeep Lounge Still Jeepers, but not vehicle-specific. Good place to share your general mechanical tips, OT stuff.

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-29-2011, 11:02 AM Thread Starter
Join Date: May 2010
Location: Wendell, Idaho.
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Dana 20 for a Dana18 with overdrive

New here. Got hooked on my 73 Commando by a friend which was a jeep freak and now he has died and I still have question hope to get answers. I have a Dana 20 in my commando and have come up with a Dana 18 with a overdrive in it. Would it do me any good to swap them out!! Looking to drop rpm's at high speeds and of course better mpg!! Or any othere ideas! Please help !!!!!!
4priebe is offline  
Sponsored Links
post #2 of (permalink) Old 08-11-2011, 11:21 PM
Join Date: Sep 2006
Location: Vancouver USA
Posts: 282
Thanks: 0
Thanked 0 Times in 0 Posts
The main difference between the 18 & the 20 is that the 18 has an offset rear drive while the 20 has a centered rear drive; this effects where the pumpkin sits on the axle, either off set to the passenger side or centered. In reality the late model 18 and the 20 cases are interchangeable but there is no way to add the overdrive to the 20. So as a 73 Commando has a centered rear end and if you install the 18 your dive line would not line up which could cause you problems.

1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back
Saddle Tramp is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email 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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

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