fixing rear end

[hobo_racer]

Does anyone know how to fix slop in the rearend of a 1st gen zip?
mine is sloppy in the gear side and every time i go off camber the transfer gear grinds with the drive gear (blue gears for torque)
any help plz!!!!

Blue gears are for top speed. I'm curious, do you have the properly matched pinion gear(the one on the motor)? I think it's 11 teeth.

[Azimov]

Blue gears are for max torque on a Zip. They are like first gear in a 1:1 car. To fix the slop, there are a couple of methods.
1. Sliver method- Slice a small sliver in the plastic next to the axel so the axel hole becomes smaller. Fill the gap with epoxy. This method is almost invisible.
2. Hogjowels method- fill the axel slot with JB Weld with the axel in place. As the JB Weld sets up, twist the axel continuously until the JB Weld is set. Keep turning the axel til it turns smoothly. This method is a bit ugly unless you do it neatly and paint the JB Weld black.
3. Place the chassis on the floor and strike it firmly with a ball pean hammer. Go to RS and buy one of the Pixar cars and put your body on it. Just kidding, lol.

Oh crap, I'm sorry, for some reason I thought this was in the xmod thread.

Azimov is correct.

[hobo_racer]

thks Azimov. Ill try em.

[Azimov]

Hey, no problem. Glad to help.
Here's a link to a thread discussing the sliver method and another diifferent method.
http://tinyrc.com/forums/showthread....light=axel+fix
You may find the illustrations helpful in using the sliver method.

[rfnagel]

Unfortunately my server with my Zaps' stuff is currently down, but here is a (slightly different) JB Weld method:

ZipZaps Rear Axle Slot Repair
=============================

This is by far the easiest method for repairing the rear axle retaining slot on
a ZipZaps chassis when it has worn to the point of the axle falling out
(causing the gears to mesh improperly). The only drawback to this specific
method is that it is permanent, you can NOT remove the axle once the repair is
complete.

1 - Obtain a fairly thick paperclip.

2 - Cut out a small straight piece of the paperclip a half an inch long using a
    pair of wire cutters or side cutters.

3 - Install the axle of your choice into the worn axle retaining slot, as well
    as it's matching idler gear. Keep in mind, the axle can NOT be removed
    after this repair is completed, so select your axle and idler gear
    carefully.

4 - Slip the piece of the paperclip over the axle in the retaining slot, and
    center it left to right on the chassis.

5 - Apply J-B Weld over the middle quarter of an inch of the paperclip, filling
    the retaining slot flush with the bottom of the chassis.

6 - Allow the J-B Weld to cure (usually overnight).

7 - Paint the JB-Weld and paperclip black, or simply use a permanent black
    magic marker.

Although you can never remove the axle and idler gear ever again, this is
pretty much a permanent repair... the axle will NEVER fall out again, and the
gears will always mesh properly -:)


Rich ¥Weeds¥ Nagel

[hobo_racer]

Thx for the help rfnagel. the pic really helped.
Azimoz the sliver method didn't really work out for me so ill try nagels way.
edit: Opps I thought the sliver thing was adding a piece of plastic not cutting a away at it and moving it..lol. any way thx for the help and off to the workbench..

[Azimov]

Hey, NP. Use what works for you. I've never used the JB Weld fix, but from what I understand it makes for a very smooth rear axle.