MIP Ball Diff Frog Compatibility?

[Dr_GN 16]

All,

I'm going to treat my old '84 Frog (re-furbed) to a ball diff for Christmas.

Modelsport do them, but list them only for Blackfoot and Monster Beetle. I've asked the question to Modelsport about if it's compatible with the original Frog, or if not, what parts I need to make it right (got no reply as yet).

From the CAD image, it seems like the diff output shaft stubs are not the hex drive versons I've got:


I've no problem in swapping them for other types, or swapping the driveshafts and outer cups, so long as they're Frog compatible. Has anyone fitted a MIP ball diff to a Frog, and if so, what parts do I need?

Any other options?

Thanks!

[Frog Jumper 3661]

If I remember correctly, the MIP diff gear requires the BF/MB spur gear.

You’ll also want an adjustable motor mount to use to larger Frog pinions on the BF spur.

Terry

 

[Dr_GN 16]

Thanks, I can get those gears I guess, but the driveshafts are different. I think I'll need some of these:

https://www.timetunnelmodels.com/live/catalog/tamiya-19808038-9808038-drive-shaft-2pcs-58354-frog-p-16256.html

 

and these:

 

https://www.timetunnelmodels.com/live/catalog/tamiya-19808039-9808039-wheel-axle-2pcsfor-58354-frog-p-16257.html

 

Do the original rubber bellows boots fit over these I wonder?

[Dr_GN 16]

Actually, I think I'll use the countersunk screw method on the original diff, and save myself £100.

[Mrowka 496]

I wish M.I.P. would get to work and make me a Fox/Novafox ball diff.

[Frog Jumper 3661]

1 hour ago, Mrowka said:

I wish M.I.P. would get to work and make me a Fox/Novafox ball diff.

Thorp made one. It’s rare and expensive though.

Terry

 

[Dr_GN 16]

Still works smoothly, but can't be cammed apart. When the thread retainer is set it should be sorted.