Rockwell: how much backlash is normal? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-22-2009, 12:36 PM   #1 (permalink)
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Rockwell: how much backlash is normal?

I just bought a 2.5 ton truck. I have been studying the rockwell links on here for a while, and I just spent about 10 minutes searching, so here goes:

How much should the input yokes be able to twist (by hand)?

When pulling this thing home today, the front driveshaft was clanging a bit and upon investigation, the yoke will turn about a half inch or so, kind of like my Lock Rights in my other rig and the Detroit I had in a Toy once....

Could it have a Detroit? this is on the front axle although who knows what somebody put in there

Or am I fawked with a broken axle shaft?

Also, is the T case full time 4x4? It looks like it just has high and low?

TIA

BTW good grief that is a heavy truck!!!
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Old 02-22-2009, 03:19 PM   #2 (permalink)
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Ok, update: I just took the front driveshaft out and the T case was in 2wd. Also, the rear U joint was bad, so that was the clanging I heard.

But the yoke still has a lot of backlash. No up/down or back/forth play though.....
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Old 02-22-2009, 03:27 PM   #3 (permalink)
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That is a little more lash then mine have but your not dealing with just one set of gears there.
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Old 02-22-2009, 03:31 PM   #4 (permalink)
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What's strange though is the rears seem really tight, though I don't have the rear driveshafts out yet....
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Old 02-23-2009, 06:31 AM   #5 (permalink)
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I guess I will just find out when I take it apart
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Old 02-23-2009, 07:05 AM   #6 (permalink)
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Its hard to tell what you're calling "backlash" but if by backlash you mean the amount that the pinion yoke will turn before taking up the slack in the geartrain, the amount that it may have I would define as "a lot." I would say, in my experience, that what you are describing is normal and run with it.

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Old 02-23-2009, 07:51 AM   #7 (permalink)
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Yup, that's what I call backlash

Thanks for the replies y'all
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Old 02-23-2009, 08:49 AM   #8 (permalink)
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Alot is normal... even up to an inch or so I have seen is common
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Old 02-23-2009, 01:06 PM   #9 (permalink)
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My rocks pinions can move 1/2" or so before taking up the slack in all the gears. I have run some fairly high RPM's with em like that and no issues. Sounds fine to me for rocks.
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