you got some deep pockets:yes:

Not really, no. I've had to replace a total of 3 diffs in all my years in RC.

First one was the front diff in my E-Maxx. That time I actually did buy a ring and pinion...

Then the rear diff in my Revo 2.5R went. Ebayed a new one for like 15 bucks (cheaper than a ring and pinion).

Then the rear diff went in my G2R and I replaced them with Mike's Conversion.

My cases are aluminum and are fine. Ring and pinon are hardened steel which makes me beleive they are fine. We will see- I have to sort this out by sunday

Also, how much play is in your CVD's (center) do they slide back and forth. If they do, consider putting something that prevents them from doing that. They run much quieter.

they dont slide back and fourth at all. my pinion is shimmed corrrectly

Run it for 1 hour doing that and then look for the metal filings... should tell you where the noise is coming from...

I don't mean something solid.

In my G2R I put a couple o-rings on one side and a small spring on the other. They can still move any which way, but this helps keep them centered, which means quieter CVD's that are less likely to pop out. Haven't had a problem yet.

pull your front driveshaft and run it. if your worried about it unloading to the front just wire a shaft(allen wrench, anything) through the front cup to hold it stationary. do a couple high grip passes and see if the tickings gone. don't run much its hard on the center diff, but fine for a couple passes. that'll get you 50% diagnosed......:tongue:

Thats a good idea.

Like you said- might be a bit much for my CD tho

My Muggy did the same thing, it was the front diff. The gears looked perfect when I pulled it out but I replaced the ring and pinion then shimmed it and haven't had an issue since. Also double check all your drive cups to make sure the screws aren't coming loose. Locking it into RWD will help with find the problem but it will be very hard on the CD so make it quick and don't push it too hard!

Are you running a plastic spur? Even if your not to me it really sounds like maybe the motor mount is flexing and the mesh is spreading? What does your spur and pinion look like? Seems like something is flexing, check everything for hairline cracks. :neutral:

Spur and pinon are fine. ended up running 2 packs of 6s through to find the problem... ended up rounding all the teeth off my rear diff ring gear.. and shattering a pinion. Both of which were hardened.


As of now i have donor gears in from a CRT they are quiet and work well.

Sounds like it was a bit tight... Or your rear bulkhead has the pinion at a funny angle.

To me, it kinda sounds like a set screw is loose on the pinion, or on the rear center drives. There's gotta be some evidence of what is causing that somewhere; you don't get that kind of noise with no visual clues.

I think it was the pinon- the teeth on it were rounded. which leads me to beleive that it just wore out...