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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

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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).

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