Drum to Disc Gearbox

[billdavies]

Hi all,
I know its been covered before but rather than surfing through old posts,
Question...Can the disc bits and bobs be swapped onto a Drum gearbox, don't need the detail just confirmation please. I can cope with the engineering its computers that drive me nuts!!!
Bill

[hutchii]

Hello Bill.
I've never owned a car with a drum brake gearbox and don't have one to look at but, given that disc brake boxes came after drums, I think it unlikely that the mounting holes for disc calipers will be present in the casting or the bosses would exist that may have been able to be drilled and tapped.
Good luck with your project.

[AlanM]

Drum gearboxes have the boss for the caliper mountings but the holes are not drilled. If you have access to good engineering facilities at a reasonable price then drill the bosses, otherwise get another gearbox. I bought a reconditioned 'Tall' gearbox off Rick Pembro that solved all the problems.

[billdavies]

Hi all,
Thanks for the responses I have had a closer look and have come to the conclusion the gearbox will require swapping...could not see any bosses or threaded holes.
So what next I need to get the engine running but am off on holiday tomorrow so it will rest in the garage drying off as it was stored outside.
Will keep you informed etc
Bill

[2cvman]

Maybe an issue?
Disc’s are LHM, where drummers DOT4 fluid?

[howardjs]

Also master cylinder is different, has smaller bore (higher pressure ratio)

[AlanM]

I converted Mungo to disc brakes, quite straightforward really but in addition to the items mentioned by others you have to change the rear wheel cylinders (the seals are not compatible with HLM fluid) you also have to change the handbrake operating arm and adjust the length of the link between the handbrake and the arm.

I did write an article about the conversion that was published in the Lomax Squadron Forum.