2 speed transmission help

[flifisher312]

I tried posting this in the newbie section but got no response. Hoping you guys might be able to help me out. Bit of a newbie question:

I recently picked up a used TH. It runs great in low speed most of the time but the high speed only works sporadically. It seems like something isn't engaging correctly, and I've had it happen in both low and high gear.



I took it all apart because I was worried the gears were stripped, wanted to start my trouble shooting there. When I was putting the transmission back together I noticed the axels the gears are on have a lot of play side to side. Also the axel the spur gear is on has some play in and out, and seems to work fine when I push it completely into the case but doesn't engage well when not.



Is play like this normal? The bearings seem good. Am I missing a shim? I didn't see one in the exploded diagram.



I also haven't messed around with the servo limits yet aside from using the limits on the radio. Is there more too it?



Thanks for any help.




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[Sr.Irie]

There is thrust washers (Green arrows) on both of those shafts and the bearings could be bad as well. Either way there should not be much in and out play.


Setting the end points on the shift servo is critical in servo life and shifting properly. There is a sticky that will walk you through it.

It sounds like you may have bought this used and it may have not been put back together correctly

[flifisher312]

Thanks Sr.Irie. I'll look at it again to see if these washers are there and double check the bearings. My shift servo settings could absolutely be the issue, I haven't looked too closely at that yet.
Thanks for the help!

[CODYBOY]

I would guess it is your end points on your servo settings.

[meatmonkey]

While you have the trans apart take some 800 grit emery cloth to the shift shaft where it passes through the trans case to polish it. Also closely inspect the trans case for extra flashing, scoring, etc... where the shift shaft passes through.

I've found that the entire shifting mechanism is very sensitive to extra friction anwhere in the system.