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November 25, 2017, 3:51pm Report to Moderator
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Hi Iggy,
            the inhibit switches are not named very well, they actually allow that gear to be used.

1st and Reverse should never go through the  OD and DO NOT have inhibit switches  - the torque could be too aggressive for it.
Like wise on the 6 cylinder engines 2nd gear is not used for the same reason.

What would be your aims if you could run 2nd OD - very limited use.

So if you have inhibit switches for 3rd and 4th then these need to be wired in parallel and then fed to earth/switch etc.
If you really want second OD then you will need an inhibit switch fitted to the GB top cover in the correct place and this goes in parallel with the other two.
If you have a  similar switch for reverse then this could well be for Reverse lighting.

If you need to install a limit switch then the thread size to use is M16 x 2mm - however the actual thread is 5/8" x 13TPI but this does not exist.

Good luck


TR4A 1967 daily(ish) driver
TR41962  having surgery at present
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November 25, 2017, 7:20pm Report to Moderator
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I could be wrong Hogie but didnt some of the early Tr5s have overdrive for second gear, but yes wouldnt be using overdrive in 2nd to much anyway, also arnt the A type overdrive gearboxes stronger than the j type. i no what you mean though i think the mgb gt v8 only had overdrive in 4th gear cause off the extra tourque from the v8 engine

1972 Mk2 2.5 PI on carbs
2005 Fiat Stilo jtd                                              
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November 25, 2017, 10:43pm Report to Moderator

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The overdrive second can slip on a standard A or J type but with uprated overdrive with a bigger pump it selects immediately with no slip and is very useful for ultra quick changes. I'll record the overdrive in action when I get a chance. Dazzer

1965 2000 MK1 Rally project, HRCR rally championship, Hexham, 12 car night rallies, trials, autotests etc, etc.

1958 DKW 3-6 Coupe. Two stroke German rally contender, screaming demon! Where modern Audi originated from.

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November 26, 2017, 9:49am Report to Moderator
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Hi Iggy,
         the TR5 may well have had OD on 2nd - using up 4A stock probably.
I always thought the 'J' type was a stronger OD but could be wrong and that is why it was fitted to the 6 pot cars.


TR4A 1967 daily(ish) driver
TR41962  having surgery at present
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