MBX5 vs MBX5T diffs interchangeable?

[BrianG]

I currently have an MBX5/CORR and was wondering if the MBX5T diffs are interchangable? After seeing othellos Robotronics truck with truggy tires, I want to do the same, but will need to gear down to compensate for the larger tires.

[wallot]

diffs are the same except ring gear/pinion. buggy is 38 or 40/12, truggy 46/10

[BrianG]

So, if I pick up the ring/pinion set, I can slap it on the existing diff cup and the alignment on the stock buggy bulkhead will mesh right?

EDIT: Are the diffs in the MBX6T and MBX5T the same? I was just browsing ebay and it seems MBX5T parts are getting scarce. Or, are they ring/pinion gears from different vehicles that will work? Also, I noticed the truggy diffs are helical cut. I know this places a large thrust load on the bearing, so I'd really like "regular" gears.

[wallot]

diff cups and internals are the same so you can put on whatever ring gear you wish.

6T and 5T may look same but they are different. They are cut differently. so you always need to match gear and pinion. however you can slap 6t gear onto 5T diff cup
6T and 6 also use different internal big gears - for 2.2mm pin compared to 2mm in 5)

never had any issue with mugen diffs. they just need to be shimmed properly and once in a while play in the bulkhead checked - I am going to replace bulkheads before coming season and the truck has about 20 races.

[othello]

Your question already has been answered as i talked with a buddy of mine who drives a MB5T/MBX6/MBX6T (he also confirmed that it is indeed possible).

I had a look at the manuals of the MBX5 and MBX5T:

MBX5 and MBX5T share the following parts:
E0103 Gear box MBX5 / 5T
C0256 Diff Case
C0259 Spur Gear

MBX5 Buggy: 1:3,38
. c0258 MUGEN CONICAL GEAR 44T
. c0211 Bevel Gear 13T

MBX5T Truggy: 1:4,6
. E0214 Conical Gear 46T
. E0215 Bevel Gear 10T

If you start this project with a buggy platform you will soon realize that you might have to widen the track (truggy arms or halfoffset rims ...) when using bigger/heavier truggy tires as the car will now be prone to tip over sideways (higher COG) more often.

Video of the BR50 chassis (Truggy chassis with shorter "buggy arms" ) and halfoffset truggy tires.

Second thought: a buggy chassis is somewhat short to deal with the higher rotational force of truggy tires which will lead to more wheellies when accelerating hard (even with a center diff). You will have to transfer more wheight to the front of the chassis to get acceptable handling. Atleast those are my findings when i fitted my buggy chassis with truggy arms and tires.

See this buggy with truggy tires thread and a slowmotion video to get a better idea how truggy tires affect handling of a short buggy chassis

Nonetheless good luck with your project.

[BrianG]

Thanks guys, that is what I was hoping to hear.

Othello; Since I'm currently using buggy wheels, the switch over to truggy should make it wider. Yeah, it'll be taller, so that will affect things. I'm using 120k CD oil, so ballooning won't be a big deal. As far as wheelies go, I have the ESC and radio settings set for gentle start ups.

Now I just have to find the ring/pinion gears (or whole diffs) without spending a fortune...