b6.2 arms and gear diff on B4.1

[spru]

back after a few years of not driving rc cars spare parts for the b4.1/b4.2 has become very hard to get. So I have following questions:

1. Do b6.2 gullwing arms fit on my old b4.1/b4.2?
2. does the new b6.2 gear diff fit the old b4.1/b4.2 diff box?

Any help is highly appreciated

Thanks,
Raimund

[bert digler]

back after a few years of not driving rc cars spare parts for the b4.1/b4.2 has become very hard to get. So I have following questions:

1. Do b6.2 gullwing arms fit on my old b4.1/b4.2?
2. does the new b6.2 gear diff fit the old b4.1/b4.2 diff box?

Any help is highly appreciated

Thanks,
Raimund

Hi mate I found the guys at mb models leeds very helpful for anything you require also bang on next day delivery

[daz75]

back after a few years of not driving rc cars spare parts for the b4.1/b4.2 has become very hard to get. So I have following questions:

1. Do b6.2 gullwing arms fit on my old b4.1/b4.2?
2. does the new b6.2 gear diff fit the old b4.1/b4.2 diff box?

Any help is highly appreciated

Thanks,
Raimund

Isnt the B4 imperial? Guessing that may cause issues

[Big G]

The b4 is imperial yes but the b4.1/2 has metric outdrives.

I’d have to actually try and fit those parts to a b4 to confirm if they fit. I’d say not at first but always worth a shot.

[Big G]

Ok the arms kinda fit.
The hinge pins are a little slack and you’ll need to shim it out a little in and out.

I’m sorry I don’t have a gearbox to try a diff in but to run a b4.2 ball diff in a b6 you need a shim so I would assume it doesn’t fit the other way.

[spru]

Great informations and thank you very much Big G for checking in detail! So gullwing arms are the way to go on my old B4.1/2 mixture :lol:

[charlesk]

Arms aren't in particularly short supply, infact the UK distributor has some in stock :confused:
The B6 diff won't fit. (too wide)
There's a possibility that the b5 one may, but part supply isn't that plentiful on those either.
My advise would be to get some b4 parts for it and keep it original.

[spru]

Good morning charlesk, thanks for your advice!
Found a really interesting article at RC10talk. https://www.rc10talk.com/viewtopic.php?t=44438
Seems that a guy fitted a b6 gear diff in a b4.1 transmission case. Another person also stated that the dimension of the b4.1 to b6 gear diff didn`t change. So I give it a try

[spru]

well, I tried a b6.1 gear diff in my b4.1 and it does not fit! It`s about 1 to 1,5mm to wide. So it`s not a direct replacement!

All the best
Raimund

[Big G]

That would explain why the proper geared diff required a shim of similar size to fit in a b6.