English Ford Transmission Selector Forks

Worn selector forks or syncro-mesh assemblies can cause the engaged gear to jump out of its position when decelerating.
Assuming all transmission components are in good condition but the selector fork facing on both sides are worn down to 5/32" thick ( new fork facings are 1/4" thick ). This excessive play within the sleeve groove
can cause the transmission to jump out of gear.
One solution is to fill the worn area of each side of the fork by weld brazing up to 1" in length and grind smooth and form to a thickness of 1/4". Do not repair forks that are worn beyond 5/32" thickness. New forks are still available i.e., Burton Ltd.
Displayed are two 113E bronze/aluminum forks from the Cortina MK1. On the left is a worn repairable fork and on the right a reconditioned fork after weld filling and finish grinding.

I have reconditioned steel forks for Anglia 105E transmissions and brass forks for the 113E - 2000E three-rail box and later single-rail Cortina MK2 box. I found that all selector forks for these boxes have a face diameter / thickness of 1/4". Reverse selector forks don't have much wear.