Diff trouble

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hairdog

Well-Known Member
Messages
77
Location
locust grove ga
I've got a fg mt that I am having trouble with the rear diff gears slipping. I have tried everything I can think of. I have adjusted the motor , Tightened all screws , and even added a turn buckle on the rear end like I did on my firehammer and still no avail. I am at my witts end. Is this a common problem? Any help would be greatly appreciated.
 
do you mean the Diff ring gear and layshaft gear not staying meshed up ?
my honest opinion is to get large and small alloy mounts and also alloy diff holder in alloy aswell and also a alloy diff cage upgrade .. its a few buck no doubt but that elimanted every issue i had ! then my machine transformed into a complete alloy monster .. its addicting :)
 
Thats what I was talking about. So your basically saying it's a problem with the plastic mounts? Will the alloy parts eliminate this problem?
 
do you mean the Diff ring gear and layshaft gear not staying meshed up ?
my honest opinion is to get large and small alloy mounts and also alloy diff holder in alloy aswell and also a alloy diff cage upgrade .. its a few buck no doubt but that elimanted every issue i had ! then my machine transformed into a complete alloy monster .. its addicting :)

I did change my Engine mounts to alloy, that was enough to hold the engine in place, I did not have to change the plastic differential cage mounts or the differential holder.

may be first try to change only engine mounts(if you have budget then go for changing other mounts, else it is not required).
 
Since you have had alot of slippage be sure to check your gears for wear. You will notice the gear slanted more on one side then the other from the gears snapping free from each other. If this is the case I would recommend getting a new gear or if it just messed with the shaft gear removing it and turning it around so that the good side of the gear is used against the diff gear. If not sure post up a close up photo.:)
The mounts will help tremendously.
 
Thanks folks. I think I'm going to change the mounts out to alloy. I learned a valuable lesson out of this whole situation. Don't buy used rc's unless you get detailed photos up front. My dumb mistake. Oh well atleast I have a reason to upgrade to alloy now.
 
I looked on python's site and everything I need is back ordered. Is the one I showed in the link above good? Also do I need the small and large mounts ? Since it's going to be apart would you changr the uprites to alloy also?
 
The rear uprights are the ones I was talking about. Don't these support the rear diff and help hold it from moving? I figured if this was the case might as well kill 2 birds with 1 stone.
 
Uprights hold the axle for the wheels and fasten to the upper and lower arms in the rear and front.
The rear differential mounts are what you are talking about.
Those are a great upgrade but I still would recommend the SS sleeve and the rear alloy cage unless you are thinking of upgrading the differential soon. You also may want to carry a couple extra rear diff drive axles, these will take a beating when bashing around and can snap at the cup - Takes 5min to replace but, can be a bash stopper if not in the tool box.
 

Exactly! Don't forget the SS sleeve - ams90 on the python site, can be found in many shops.

After all your parts arrive do the silicone mod found here even after the ss sleeve install, except those pesky rear diff outdrives.
 
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