Loud noise forward and Quiet in reverse

[t3yf5g]

The drivetrain is really loud going forward. Almost like grinding but not really. Going in reverse is almost silky smooth.

I got this Wraith in a trade so I am not sure how the maintenance was done.

Should I pop off the diff covers and pack some grease in there?

[t3yf5g]

So turns out it was my spur gear. The pinion gear looks directional, if that makes sense.

You can see the teeth looks more like a saw blade.


Then the spur gear is damaged pretty good. Explains the quiet reverse.


Read the begginer's guide post and know that I need to step upto a 32p spur. Anyone have $0.02 to give on spur gear and pinion?

[Solitaire]

What exactly are you asking?
Brands of suitable spurs?
Gear ratios?

If you check Harley's guide, it has a few suggestions.
Choosing a motor and ESC for your Wraith - Gearing Added!

[ScaleFreak93]

By the way, that pinion is not directional, just completely tore up, needed replacing a long time ago

[t3yf5g]

I'm sticking to stock gearing, just brands I guess is what I am after. I just ran across Robinson Racing Slipper Unit 80T Steel Spur Gear: Wraith RRP1545. It being steel, I wouldn't need to do a 32p spur right?

[eric113]

I Would swap to 32p gears. They hold up better.

[Solitaire]

I'm betting the guy you bought it from used a metal spur and that's what chewed up the pinion. A nylon/plastic spur wouldn't do that sort of damage. That truck has been run hard. It appears you also may need a new slipper pad.

You should check the axle shafts and lockers, too. Maybe the tranny gears as well.

[t3yf5g]

I did a tear down last night and with the motor out, the drivetrain spun freely and no noise. I will crack open the diffs to make sure. Ordering up a 2spd tranny from rc4wd later this week

[JeremyH]

Originally Posted by t3yf5g

Anyone have $0.02 to give on spur gear and pinion?

A 56T from Duratrax:
TowerHobbies.com | DTXDTXC9397 DTXC9397 Duratrax Spur Gear 32P 56T Nitro Evader BX

And 14T from Robinson Racing:
TowerHobbies.com | RRP0140 0140 Robinson Racing Pinion Gear 32P 14T

will put you back at your stock gearing.

[t3yf5g]

Found the Robinson Racing metal slipper spur and pinion. Being metal, I stuck with the 80/20.

[Natedog]

Originally Posted by Solitaire

I'm betting the guy you bought it from used a metal spur and that's what chewed up the pinion. A nylon/plastic spur wouldn't do that sort of damage. That truck has been run hard. It appears you also may need a new slipper pad.

You should check the axle shafts and lockers, too. Maybe the tranny gears as well.

Yes! Wow worst looking pinion I've ever seen lol!

[Tonysmini]

Is that a steel pinion??? I've seen a few Tamiya alloy ones like this but that's a first on a steel if it's only been used with the stock spurs.

[t3yf5g]

I think Solitaire had it correct. Used a metal spur and ran it hard.