Some of the WLToys K989, K969 and 284131 comes with sticky or stiff drive trains that needs an upgrade or fix by freeing it up. In this video we fix both the drive train and the differentials that are so stiff they work like locked diffs. This is an easy and free upgrade that will improve performance.


0:00 Intro to problem
1:49 Remove both diffs
3:50 Locating the issue(s)
4:07 Diff disassembly
4:35 Checking diff and fixing diff axles
5:30 Fixing diff side gear
6:10 Greasing and re-assembly diff
7:20 Checking drive train
7:45 Fixing diff housing
8:07 Removing forming residues from gears
8:37 Greasing drive train
9:00 Re-assembly and lubing
11:23 Run in

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