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What would cause backlash to increase over time?

ScaldedDog

Well-known member
Joined
Nov 26, 2020
Member Number
3082
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61
The title asks the question. Here's why I'm asking:

Using the lazy man's backlash measurement (how far can you turn the driveshaft by hand before it hits resistance), I've noticed it has increased over time, and I can now turn the rear driveshaft nearly a quarter turn with one hand. (By contrast, I can turn the front shaft about half that.) The 3rd was setup by ZUK a number of years ago with my 20 year old Detroit locker and cryo'd gears. The ring gear teeth look fine, and I can't find hardly any metal in the bottom of the Diamond housing with a magnet, and what little I do see is just dust. The gears sound fine, to the extent that I can tell, but I do get a little decel clunk.

What might cause this? The only thing I can think of is the cryo'd gears are wearing. The rig is a trailer queen but does get driven around Moab some a couple of times a year. Other than that, it rarely sees the road.

What else might cause it?

Mark
 
/\ True. It may be time to freshen up this axle.

Mark
 
I have nearly a quarter turn until the mine meets resistance with my detroit. I always assumed it was normal. I get no clunk though.
 
I have nearly a quarter turn until the mine meets resistance with my detroit. I always assumed it was normal. I get no clunk though.
Interesting, and good to know. Do you have a traction bar? I did, so it's more prone to decel and acceleration clunks since the springs can't absorb any of that shock load.

Mark
 
/\ Yeah, I'm thinking I should just run it, which is what I've been doing for a long time. If it doesn't break, perhaps a tear down/refresh is in order later.

Mark
 
Interesting, and good to know. Do you have a traction bar? I did, so it's more prone to decel and acceleration clunks since the springs can't absorb any of that shock load.

Mark
I do have a traction bar so that may be the difference. I also have coils and a 4 link in the back
 
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