Tbevofreak

You need the updated gears V1.1, HPI will send them to you for free

If you already have them then its your shimming thats not right like Exe stated above

The Pro 4 doesn t have to much prob with gears stripping so check

Geetoo

iTrader: (1)

The pro4 diff design is far more efficient than any other shaft brands available. Other brands have more gear noise and fragile issues as far as stripping is concerned.

loopedeloop

Well I was stripping a v1.1 gear on the front oneway every raceday, changed to a ball diff and they break no more

AMGRacer

I asked the same question here and did not get much concrete information so I did some testing for myself. Here is what I found:

1. If you are hitting solid things, boards, concrete, with any sort of decently powerful motor (like your brushless) with a front oneway installed and you are still on power you will break a gear no matter what the shimming is or whether you have the 1.1 gears and plate. Even stock motors can easily damage the gear, but is much less likely too. Jumping into the air and landing on power also will break gears. The same is true of most shaft cars with a oneway.

2. If you change to a front diff the chances of breaking a diff is almost 0. I have never broken a diff with this setup.

3. Shimming it up ultra tight will help. Stock for the front is .3 on the short side and .2 on the long side. I use .6 on the short side and with the oneway break far fewer gears, however I still can chip them. My track has boards on the outside of fast corners and uses the road rail system. The boards will eat gears if you hit them under power, and the road rails launch you and if you land on power also you can break the gears. At .6mm I chipped two teeth the other week and crashed a whole bunch.

rc-zombies

iTrader: (9)

install a wide front bumper to decrease the chances of gear strippage.

ElectricConvert

Thanks for the reply AMG. I've shimmed mine with .4 on one side and .1 on the other such that the gear is meshed tighter. I've also added extra shims on the input shafts from behind the pin that the small bevel gear latches on to to remove play.

Do you think removing the o-rings on the main shaft would reduce the movement in the diffs when the car flexes during a crash or hitting the chicanes when you keep things tight defending the line?

How do you set your front diff (if not running one way)? Looser than rear or tighter?

JayBee

iTrader: (31)

The Yokomo SD doesn't -JB

ElectricConvert

What's this wide front bumper? Who makes it and where can I buy them?

BTW, I've heard of some conversion stuff involving TC3 parts. What does this entail?

yellow15

i've just bought a Team Atlas Handwind Excel-G 8 x 2 mod motor and i'm thinking of putting it on my pro4 and have some fun with it. So I'm just wondering what sort of gear ratio or rollout shuold i use?

I've bought a pinion gear which would give me about 9.0:1 gear ratio but the pinion was too small so it didn't fit (i'm using 67T spur) so i'll need a bigger pinion and wonder what's the largest i can go for and still safe?it's just for fun so i don't need the best performance but i want to know what sort of rollout is "safe" if i want to run it on my pro4. i will probably be usnig foam tyres and it's a small/medium size outdoor track.


I know getting a bigger spur can fix this problem easily but as i'm racing in the 540 silver can class i'll need the 67T spur and i don't want to change my spur gear all the time.

so anyone can give me some suggestions?

axel

the pro4 doesn't fit 3700 does it?

Thraex

No not directly, you have to file some graphite away at the battery slots to make them fit.

rc-zombies

iTrader: (9)

you can use the BRP TC3 wide front bumper. or if you have some Kydex..you can make your own.

Skill

I have the Team PRP chassis kit and I an running a pack of GP3700s with no extra material from the chassis taken away, although I think they may sit just slightly higher than my 3300s, there is no problem with running them. I'm not sure if this is the same for the stock Pro 4 chassis as I only run the PRP one now.

Tbevofreak

You seem to be so sure about that, have you ever tried or owned another shaft car?

I have a SDW and its more quiet than my TC4, the hollow CF shaft and the light aluminium input shaft makes it also a very efficient drivetrain

also a part from the TB evo 3 that had big issue with stripping gears I dont know wich fragile cars you talking about..

moot

i use ib3800's in my car with the 2mm chassis.they fit without a problem