Rebuilding 2.25 stealth diffs - substitutes and all

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Lonestar
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Rebuilding 2.25 stealth diffs - substitutes and all

Post by Lonestar »

Howdy yall

as the tide wipes out our conversations daily, I thought it was time to capture all these in a topic.

The issue: rebuilding stealth diffs has gotten expensive and parts ref aren't that clear. Let's list all tips and tricks here as they develop :)

for a full-blast rebuild, you theoretically need the following AE refs:
- diff rings: #6579 - $2 - https://www.amainhobbies.com/team-associated-differential-drive-rings-b44-asc6579/p16636
- T-nuts + cover + bolt: #6575 - $6 - https://www.amainhobbies.com/team-associated-differential-thrust-bolt-bearing-cover-locking-tnut-asc6575/p8001
- Thrust washers: #6573 - $8- note that these now come with an extra bolt. https://www.amainhobbies.com/team-associated-differential-thrust-washers-and-bolt-asc6573/p7999
- Main Balls x12 (3/32"): #6581- $12 - https://www.amainhobbies.com/team-associated-3-32-carbide-diff-balls-14-asc6581/p5227
- Thrust Balls x6 (5/64"): #6574 - $2 - https://www.amainhobbies.com/team-associated-5-64-precision-differential-thrust-ball-6-asc6574/p8000

That's to say pretty much everything but the diff spring (which doesn't really wear out), outdrives, and main gear.

That'll set you back $30 :shock: Some of these prices have increased like crazy lately. Not only did 6575 used to include the T-nut + Thrust washers, but it was $2 not too long ago (vs. $13 today if you add 6575 and 6573's prices...). I mean, like a decade ago, not 25 years ago. See package I kept in stock, picture from yesterday's diff rebuild session:
6575 Tnut + washers.jpg


@GoMachV suggested using the TC3 diff rebuilt kit #3926 - $14
https://www.amainhobbies.com/team-associated-differential-rebuild-kit-asc3926/p32580
That compares vs. $17 for thrust assembly +diffrings+Tnut - you get an extra bolt and spring, but frankly these don't wear out ... :roll:
The picture on AE's site shows the long T-nut for #3926, as the TC3 outrives were asymetrical (remember, conical gear :) ):
@DaveM confirmed that #3926 has both long and short T-nuts, so it's perfect for rebuilding a Stealth diff :)

(which, again, shows that the single T-nut pack at $6 is stupidly overpriced... :roll: )

Alternative solution, again from @GoMachV : Associated 9351, B2/B3/T4 diff rebuild kit.
https://www.amainhobbies.com/team-associated-differential-rebuild-kit-rc10b3-t3-asc9351/p58119
Image
Watchout: these are the wrong diff rings... An extra set of #6579's is $2 :)




Spare Thrust washers:
I have a few NIP MIP $2-a-pack 9151's at home... They are for the B4. Yesterday, I pulled out some used B4 diff parts I had, and proceeded to check whether they would fit in the original stealth outdrives. First, they look VERY similar (2.25:1 parts on left, 2.6:1 parts on right).
2.25 vs 2.6 thrust and bolt .jpg
And the answer is: same part, fits like a glove.

Which means, one can tap into the more modern B4/SC10 diff parts supply to rebuild the original stealth diff :)
Hence, these parts can be used:
- Thrust: Remember the bolt doesn't wear out, really...
- MIP 9151 (available for $3 still, in some places)
- ASC 9274 $4.50 - washers + bolt (grrrr) https://www.amainhobbies.com/team-associated-differential-thrust-screw-washer-set-asc9274/p130504
- Any of the Protek/Shelle/Avid $8 to $10 combos that also provide you with a caged set of ceramic balls, too :)
- T-nuts: not many alternatives here :(
- MIP 15010 $10 is a lovely machined piece, but not cheap https://www.amainhobbies.com/mip-aluminum-0.250-bore-machined-tnut-mip15010/p450995
- Custom works $5.50 seems to be repackaged AE stuff https://www.amainhobbies.com/custom-works-differential-thrust-bolt-cover-tnut-csw4361/p640924

Serpent has a great looking (cheap) T-nut / externally adjustable and (expensive) sealed bolt a(a la losi) from their SRX2 but I'm sure these are metric. Maybe they would work in the stealth outdrives - anyone tried?
https://www.amainhobbies.com/serpent-ball-differential-bolt-2-ser500172/p269204
https://www.amainhobbies.com/serpent-spyder-differential-tnut-2-ser500187/p269219



Spare Balls:
The hot combo is carbide main balls, ceramic thrust balls. Ceramic main balls are too demanding on the diff rings and lube quality, performance is higher but so is wear and the tuning window is much narrower. For shelfer where the diff isn't stressed :lol: steel balls all around are perfectly fine :) For my rebuilds, I use:
- Steel - eitther the below, or sometimes I also buy bulk from non RC sellers.
- 3/32": Yokomo 505 (x24!) $2 https://www.amainhobbies.com/yokomo-3-32-differential-ball-24-yokzd-505/p242512
- 5/64": AE 6574 $2 (the original ref...) https://www.amainhobbies.com/team-associated-5-64-precision-differential-thrust-ball-6-asc6574/p8000
- Carbide 3/32" and ceramic 5/64" for runners: I buy bulk only... LHS prices are not acceptable I think, for the added value they provide. Not worth it.




Next section - lubes - TBC.
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Re: Rebuilding 2.25 stealth diffs - substitutes and all

Post by NomadRacer »

Subscribed :mrgreen:
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Re: Rebuilding 2.25 stealth diffs - substitutes and all

Post by DaveM »

Hi,
ASC3926 includes both long and short T-nuts.
I just checked my three packs, I ordered them on the 19/Dec/2017.
The Tower Hobbies pic only shows the short T-nut as well.
:)

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Re: Rebuilding 2.25 stealth diffs - substitutes and all

Post by Lonestar »

DaveM wrote: Wed Mar 14, 2018 8:06 am Hi,
ASC3926 includes both long and short T-nuts.
I just checked my three packs, I ordered them on the 19/Dec/2017.
The Tower Hobbies pic only shows the short T-nut as well.
:)
Thanks - Great info. Now I need to buy a TC3, then :mrgreen:
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Re: Rebuilding 2.25 stealth diffs - substitutes and all

Post by GoMachV »

Yeah 3926 is the part number I use. I have no idea what’s in that 6526 you say I call for :shock:

It comes with both styles of T nut but no diff balls.

The 9351 B2/B3/T3 rebuild kit contains the same complete thrust assembly and T nut with different diff rings. In a pinch it might be easier to find one of those hanging in a hobby shop and reuse your old rings
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Re: Rebuilding 2.25 stealth diffs - substitutes and all

Post by Lonestar »

GoMachV wrote: Wed Mar 14, 2018 10:04 am Yeah 3926 is the part number I use. I have no idea what’s in that 6526 you say I call for :shock:
Me neither - the link was correct but the part ref wasn't. Too many simultaneously opened part #'s webpages on the same computer are probably part of the reason :oops: Fixed now :)
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