You are here:

MG Car Repair/trans conversion


I'm almost done installing a T5 into my 1979 mgb and have done the hard work without buying a kit ( was even able to keep original bellhousing, starter, pressure plate and clutch slave cylinder) The problem is I no longer have a switch on the tranny to activate the vacuum advance solenoid. The T5 replaced the stock 4 speed. California car emissions stock engine. Any thoughts on a way to rig the shifter so it advances in 4th and 5th gears automatically.
Thanks. Stan

Hi Stan.  

Well done.  I admire what you have done.

The MGB gearbox that you removed had a TCSA switch built into it.  Unfortunately, the T5 gearbox does not have any provision for such a switch (unless you can fabricate one).  

I would recommend that you fit a manual switch (possibly with a warning light).  Leave it switched on whenever the car is tested, and turn it off when you want to enjoy the car.

Barrie Jones  

MG Car Repair

All Answers

Answers by Expert:

Ask Experts


Barrie Jones


MG Sports Cars from 1949 to 1980 - Including MGB, MGBGT V8, TF1500, TF, TD and modern Midgets. I also specialise in SU carburettors, Lucas wiring, suspension, steering & brakes.


I have owned my 1955 TF1500 since 1966. Technical specialist for the TD and TF with the MG Car Club T Register. Also owned 20 MGBs and currently own an MGBGT V8. Written 3 books on MGs and produced a DVD on how to strip and rebuild the TD/TF gearbox.

MG Car Club.

Barrie's Notes on the 1953-55 MG TF (author). /=====/ Barrie's Notes on the MGB (author). /=====/ Barrie's Notes on the MGB GT V8 (author). /=====/ The Essential Buyer's Guide to the MG TD, TF and TF1500. (author)

M Phil, C Eng, BSc (Eng).

©2016 All rights reserved.