American MGB Association Message Board

Technical Area => Transmission Related Discussion => Topic started by: march2021 on February 14, 2021, 01:01:09 PM

AMGBA website home page or AMGBA Photo Gallery or AMGBA Club Blog
Subscribe in a reader


Join or renew today and receive a free t-shirt or tech CD, see details in the join the club section at www.mgclub.org!

Title: Overdrive Transmission Replacement
Post by: march2021 on February 14, 2021, 01:01:09 PM
I have a question about a transmission.

Is it possible to take out a 1973 four speed transmission and replace it with a transmission with overdrive? Other than an electrical connections of course.
Tommy K.
Virginia Beach, Virginia.
Title: Re: Overdrive Transmission Replacement
Post by: JohnTwist on February 14, 2021, 01:03:10 PM
The simple answer is YES!!

The drive shaft is the same length.  The gearbox mounts are the same. The reverse light wiring (Green and Green/Brown) is the same.  You can move your seat belt warning switch from one remote control housing to the other (if you wanted to – most wouldn’t bother).  The BIGGY here is to test the 3-4 lockout switch TWENTY times to ensure it goes continuous in 3 and 4 (or, if it’s a later gearbox (sidefill) maybe just 4th). 

Change the front and rear seals and ALL the O rings before you install it. 

Hope this helps!
John H Twist
SAFETY FAST!
University Motors Online
www.universitymotorsltd.com

   AMGBA website home page or AMGBA Photo Gallery or AMGBA Club Blog