DBM

Aftermarket.
These are the ones that I bought:

http://www.tqrcracing.com/shop/produ....asp?p_id=2731

DBM

I'm a bit confused. The chassis is from Spec-R but comes in an ID Products bag? Hmmm.

funked1

iTrader: (10)

Just another data point... my S2 diff o-rings swelled up into donuts too. It felt fine when I assembled it initially, but the car had pretty severe understeer, so I tore the diff down to check. It wasn't so much that they were squeezing the outdrive axles, but they were coming out of their grooves and pressing on the 5x14 shims and causing a godawful amount of friction. Someone said TRF 5mm o-rings worked so those are on order...

Also the SPR010-SC screws do work on the HD Diff. As I mentioned before, the phillips head kit screws were falling apart almost instantly.

1101

Thats because its NOT a Spec-R made part. People just assumed :-)
Even on the Spec-R site it states ID Products as the manufacturer.

DBM

To me, it looked like an aftermarket item since it was listed under "iD products" on the specR site, but Jorge T said that it was a specR part. Unless iD products is a division of specR.

Oh well, it doesn't really matter.

I installed the chassis last night. All of the holes lined up perfectly. No additional shimming/removing of shims was required. A pleasant surprise is that this chassis is ~5mm narrower than the pro spec chassis (not including the servo mount protrusion on the pro spec chassis). The finish isn't as shiny on the new chassis, but that shouldn't affect the performance anyways.

Infamous 1ER

iTrader: (7)

What's the best web site to order parts? Thanks

mooby64

iTrader: (3)

tqrcracing.com

Syxxstring

iTrader: (6)

I've had no problem with the screws, but I bought an additional diff for my 2 cars and it cam with hex drive screws.
The O rings were a big issue I just bought the x-ray ones.

F1Jet

Which gear diff did you get? (the S1 gear diff has different internal gears, seals, etc than the S2 gear diff).

Has anybody tried putting the S1 gear diff in the S2? Or vice versa? Were any advantages found? Any comments on which gear diff you thought was superior (in terms of drive ratio or not leaking or something else?

Also, tqrcracing only has internals for the S1 gear diff. Has anybody found a US source for S2 gear diff parts?

F1Jet

Has anybody found a perfect way to install the center pulley in the S2 metal motor mount so there is no friction when the screws are tightened fully? The pulley shaft is longer than the width of the motor mount and the plastic bushings have flanges on them that can make a lot of drag.
Photos of your installation would be appreciated if you have them.

.crispy

Either gear diff will fit either car.

Here's how I resolved the friction problem when the screws are fully tightened.

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Wait for it...
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I didn't tighten them fully.

For realz...

That and I mix and match the bushings. One white, one black. Or I sand down one bushing.

BTW, the flanges should be on the outside of the mount and will not touch the bearing inside the center pulley.

funked1

iTrader: (10)

Here's how I did it. I used POM bushings but it works the same with the black kit bushings.
Flanges go on the outside with a couple of 7mm x .3mm shims. You want to be able to tighten the screw all the way without compressing the bushings and bulkheads. Done up this way my spur assembly has only .1mm of axial play and nothing rubs.

F1Jet

THANKS SO MUCH FOR THE FEEDBACK!

F1Jet

THANKS! I WILL PUT A LITTLE THREADLOCK ON ALSO.

funked1

iTrader: (10)

Also, my pic is with a Kimbrough spur gear. If you have a wider spur, you might need to sand the bushings. With a narrow spur you might want shims between the bearings and the bushings.