Best Diff Case upgrade for K8S?

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bobs1811

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What is the best upgraded aluminium diff case for K8S that is currently available?

Vitavon - https://www.ebay.com/itm/284120357642?
Arrma - https://www.arrma-rc.com/en/product/metal-diff-case-set/ARA310975.html
Hot Racing - https://hot-racing.com/?partnumber=AFE1101;c=1476
GPM - https://www.gpmparts.com/arrma-krat...ential-case-5pcs-set-gpm-makx011-p-24411.html

Has anyone tried more then one of them?

I actually have the Vitavon diff case for the rear however I've ended up snapping the screws and pins so looking to replace it (possibly just to much power? running Flier 12s esc, cc 800kv, 34/39, diff weight F500k/C earplugs/R300k I think, M2C and Vitavon upgrades, total weight around 38lb with batteries (CNHL 6s 9500mah x2), Flier esc Start power set to 'Auto', Acceleration Forward set to 40% on Radiolink RC6GS V2 tx.

Looks like the Vitavon is still the best option at the moment which is made from 7075 aluminium, so will probably just get another one of those..

View attachment 215525
 
Under what conditions are the aluminum diff cases typically required?

Why are the stock cases failing?
The larger aftermarket motors (castle 2028 for example) put more torque/stress on them and the cups break.
 
The larger aftermarket motors (castle 2028 for example) put more torque/stress on them and the cups break.
To clarify, you are saying under load the OEM case around the diff output shaft (to the cup) is the part of the diff case that is failing?

Why are the fasteners and pins also failing (I think on the aluminum case) as said above if anyone could speculate?

Curious if the entire diff assembly is under rated, or just doesn't have very much overhead to expand before failure? Are stock cases reliable at stock power levels, for instance under shock loads like landing on power on a highly grippy surface?

Are stock diff cases failing even at ~ stock loads, or exclusively or maybe predominantly at much higher output levels?

It is mostly the rear having issues, or both front and rear equally?
 
Last edited:
To clarify, you are saying under load the OEM case around the diff output shaft (to the cup) is the part of the diff case that is failing?

Why are the fasteners and pins also failing (I think on the aluminum case) as said above if anyone could speculate?

Curious if the entire diff assembly is under rated, or just doesn't have very much overhead to expand before failure? Are stock cases reliable at stock power levels, for instance under shock loads like landing on power on a highly grippy surface?

Are stock diff cases failing even at ~ stock loads, or exclusively or maybe predominantly at much higher output levels?

It is mostly the rear having issues, or both front and rear equally?

I didn’t have the issue with the stock rtr gear but once I installed the larger after market gear this started happening. 🤷‍♂️

9E14C524-FC7E-48E9-8FFD-7F562769392F.jpeg
FBC4FB56-535D-499F-A40A-E0F97F893F9B.jpeg
36179AD2-F74D-4447-B3F0-C4C7DBBC85FC.jpeg


Even the Arrma upgraded cups weren’t up to the task… 😒
BFC49890-30FE-452D-9D29-81E31F85CC6D.jpeg
79C571FC-AD90-457B-916A-EED92D37D9A6.jpeg

I’ve heard the Vitavons are better tho, haven’t tried them yet..
 
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