Quote:
Originally Posted by Mutant
The balls would have got hot as a result of the diff slipping. The use of any mod or 19t motor will require the use of a slipper to avoid this issue with any confidence. If using the stock silver can then when you rebuild it do it up until you can feel resistance when turning the wheels, at this point they should not spin freely when you hold the spur. this should be tight enough. another check is to put the rear tyres on the ground and pull the throttle, any slipping noise should come from the slipper (if fitted) not the diff.
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Sadly I think this diff is a bit of a 'throw away part'. The kind of thing that you run till it pops, then just bite the bullet and buy replacement parts.
The two output shafts that come from tamiya, that are the bread that sandwiches together the 'ball diff' itself appears to be a weak point, along with the plates they attach to. Plus, the diff gear itself is nylon! I suppose you have to run it really hard for quite some some to melt it out, but it would appear that it's been done on more than one occasion. I've looked everywhere for a metal replacement gear specifically for the rear to no avail... 3racing seems to be the most popular choice for metal/graphite replacement parts for tamiya cars but they don't do gears apparently. As with any smart company, tamiya, in order to purchase a new stock rear diff gear, you gotta get it with the spur gear set.
http://www3.towerhobbies.com/cgi-bin...?&I=LXMSD1&P=7
Of course you can't just get the 'one gear' by itself!
I've upgraded my Avante with a Trinity Co27 Monster Stock pro motor... ...love it! Not too quick that I can't drive the car comfortably in my back yard, and not so slow that it's boring setting up and drive around the track in the tennis court across the street!
Anyways, I've just started to notice that if I come hard into a corner and slide to a stop, then pin the throttle, I'm hearing some slip from the diff. I know I'm going to have to make a new purchase of some diff parts soon. I'll probably buy the who kit... plates, gears, balls etc at the same time so that I don't have to make 10 trips to the store saying, "Nope that didn't do it."
Thoughts on solutions to an obvious weak point?