I have a seven gearbox that's been at the back of my garage for about 20 years, is there a way of identifying what type it is e.g. three or four speed, crash box or synchro

Ron

Location: Kent

4 bolts holding the lid on =3 speed

6 bolts holding the lid on =4 speed

6 bolt lid with a big nut type thing on the front of the gearstick turret =crash box

6 bolt lid, no big nut thing and lid stamped "SYN"= 2 synchro box

6 bolt lid as above but lid stamped "2 SYN"=3 synchro box

Above re 4 speed boxes assumes that the lid belongs with the box. Looking down inside is the best guide.

Location: N W Kent

Thanks for the reply Stuart

Ron

Location: Kent

...and don't forget if it has an "S" stamped on the rear of the box by the reverse shaft flange, or on the lid in place of the " SYN, it could well be a Nippy / 65 box.

Location: Melton Mowbray

I may well be wrong, but, doesn't the 3-synchro box have a rounded extra cut-out at the front of the main casting underneath where the lid sits?

Rob
Yes - and this helps if the lids have been swapped!
Colin

Just found the markings under a lot of crud, it is marked 2 SYN 3219 A, I guess that makes it a 3 synchro box, don't know what the cut out on the casing is though, under the plate I assume it is the selector plate sits in 2 half rounds in the casting, next to this is a half round about the size of a 1 penny

Ron

Location: Kent

The extra half round cut out is to allow the removal and refitting of the mainshaft. That makes it a 2/3/4 synchro box.

Location: Gard, France 30960. Used to be Languedoc-Roussillon but now it's Occitanie