It's easy with the top off. Less so with the top on, though the code letters should give important clues. Non-OD 3 synchro have a square output flange, but that doesn't help where OD is fitted.
The original Herald boxes and Spitfires 1 - 3 were all 3 synchro. MkIV and I think all Dolomite/Toledo variants were 4 synchro. On the 3 synchro boxes 1st is always noisy as the gears are straight cut but 2nd and 3rd should be markedly quieter if the box is healthy.
Sounds like you have enough donors to have a fair chance of building one that works......
I suspect 3 syncro, but actaully not overly certain how to tell the difference!
It is a 3-rail box, if that helps.
Fortunately I have the spare O/D Box, and two non-OD boxes to pick parts from, so hopefully I can get enough usable bits to make one decent box. I have however noted that 1/2/3 gears are noisy compared to 4th, where everything suddenly quietens down.
Ohh, and I have the propshaft as well, the seller included the steering column and prop with the box! (Except it will probably Gearstick switch ultimately).
The OE CVs fit fine when the link has been opened out as per the drawing and I think the R100 and MGF outer CVs are the same part though the ABS tooth equipped ones are much more common on the MGF (never seen an ABS-equipped R100 although they do exist in theory).
Aftermarket parts are another matter. I’ve not had many through my hands, but all that I’ve seen personally have also been fine. I have had a couple of people come to me with the same issue as you though, so clearly there is some variation. I also had comment from one gentleman with a racing GT6 that he’d broken two new aftermarket CVs. I supplied him with a couple of used OE ones which seem to have survived
Thanks for the reply the rear of the upright was skimmed as per the diagram there is 3mm of difference in the cv joints so quite alot of material would have to be removed from the upright. Also its all built up so I would rather not have to stip it all down again.
Hi im doing a cv conversion using the rover 100 shafts and the mgf wheel bearings. When I bought the rover 100 shafts they came with 1 outer cv joint. This one clears the upright and works fine so I bought a pair of new rover 100 outer cv joints. However when they came the outer diameter is bigger and locks up on the upright when the nut is tightened. So next I tried some mgf ones. They are the correct outer diameter but the wrong shape and also lock up on the upright when the hub nut is tightened. Does anyone know what the correct joint to use is?