Fed up with my '71 manual shift lever clouting the shift console plate in first and third and subsequently popping out of gear because of incomplete engagement, I finally got round to doing something about it. Since my car was cleverly designed with the option of conversion to short shift if preferred and since this would obviously sort my problem, that's what I did.
In theory the conversion is a simple matter of dropping connection of the 1-2 and 3-4 selector rods from the upper holes in the selector levers (arrowed red in the diagram below) to the lower ones (arrowed blue). In practice it's a little more work. The change necessitates adjusting the length of the selector rods and this has to be done without moving the levers in the shifter which could block free movement from the 1-2 shift line to the 3-4.
It turns out to be an over and under job, so after removing the console plate and the shift inner gaiter to expose the shift levers .....
.....I take advantage of the sunshine and moved my QuickJack outside to hoist the car off the ground.
Underneath the transmission is covered in the oily grime only 50 years of use and inattention can produce and access to the shift rods is also partially obscured by the back-up light switch connected to the reverse shift lever. This was easily removed and put to one side.....
....as It's now redundant, my back-up lights have been converted to amber indicators.
I disconnect the shift rods and remove the levers from the box .....
......to clean everything up before reassembly.....
Before putting it all back together I have to lock the shift with a locking plate to ensure the movement from the 1-2 shift line to the 3-4 is unimpaired. This is done by inserting a thin 5/8" wide plate into the side of the shifter, which without removal of a lot of parts to allow access, is practically impossible from underneath.
So, back inside the car I still can't see the slot to fit the setting gauge but with a bit of ingenuity think I should be able to 'feel' it. I rivet the plate to a length of aluminium strip and bend it sideways .....
Sliding this down the left side of the shift arm a bit of fiddling allows me to insert the plate and lock the shifter in the neutral position
Back underneath I refit the arms to the gearbox and adjust the fittings on the selector rods until the pins drop cleanly into the new lower hole position, then carefully tighten every thing up.
Back in the car, remove the locking plate and check shift in all gears - seem OK, so refit the console plate and the shifter parts, lower car back on the ground and off for a test drive.
Mod seems to work well. Shorter shift feels more precise and there's no discernible increase in shift forces - and the shifter no longer clouts the console plate - and all for £0 - result!