American MGB Association

North America's oldest, largest and best club for all year MGBs, MGB-GTs and Midgets!!  Established in 1975.


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for all year MGBs, MGB-GTs and Midgets
Established in 1975

Phone/Text: 773-769-7084

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this is an excerpt from the articles appearing in the OCTAGON

also see upkeep and performance hints on our message board at
and on our Facebook group at

Overdrive Transmission Replacement

Q:     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.

A:     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
University Motors Online

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