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73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: srozell on July 05, 2017, 02:05:03 PM

Title: Manual Hub not engaging
Post by: srozell on July 05, 2017, 02:05:03 PM

If I disassemble, then reassemble the hub, it engages and remains engaged.

When I switch the hub to "FREE" it disengages as expected.

When I switch back to "LOCK" it no longer engages, and makes a clicking sound when the wheel turns.

Inside I found wear on the following components. I've also enclosed a picture of the shop manual for reference and clarity.
(https://myuglytruck.files.wordpress.com/2017/07/20170705_113940.jpg)
(https://myuglytruck.files.wordpress.com/2017/07/20170705_115016.jpg)
(https://myuglytruck.files.wordpress.com/2017/07/20170705_115228.jpg)

Should the axle shaft sleeve and ring really be wearing on the outer clutch retaining ring?

Should I be replacing the manual hubs, or is there something else I should be doing first?

Title: Re: Manual Hub not engaging
Post by: VileZambonie on July 05, 2017, 06:14:17 PM

I would replace the locking hubs

Title: Re: Manual Hub not engaging
Post by: srozell on July 05, 2017, 07:37:15 PM

That's kind of what I was thinking. I cleaned the pieces up a bit, removed the burrs and such, and it engages now, but I feel like it's only a stop gap.

Title: Re: Manual Hub not engaging
Post by: ehjorten on July 06, 2017, 09:22:12 AM

On that note...I understand you can't get those Spicer hubs anymore?  I have them on my 1-ton crew cab.  What is the standard for replacement...Dynatrac...Yukon?

Title: Re: Manual Hub not engaging
Post by: srozell on July 06, 2017, 02:27:43 PM

I was going to go with the Warn 20990. Is there any reason not to?

https://www.warn.com/truck/hubs/premium_application_chart.jsp (https://www.warn.com/truck/hubs/premium_application_chart.jsp)

Title: Re: Manual Hub not engaging
Post by: jetman on July 09, 2017, 03:44:13 PM

I use 'em.  Work great, engage easily.  Don't need the spindle nut kit.

Title: Re: Manual Hub not engaging
Post by: srozell on July 09, 2017, 07:54:32 PM

Thanks!

Title: Re: Manual Hub not engaging
Post by: srozell on July 11, 2017, 05:40:01 PM

I installed the Warn 20990 hubs today. It generally went without a hitch. Someone had dented one of the wheel hubs a little so I needed to do some die-grinding and subsequent clean-up so the hubs would fit well, but other than that, installation was seamless.

Title: Re: Manual Hub not engaging
Post by: jetman on July 11, 2017, 10:38:43 PM

That was fast!  Should I have known you were in process I would have mentioned.
Pro Tip #482 - use a pair of pliers to bend in one end of the hub retaining snap ring.  Makes it much easier to remove the hubs for bearing service at a later date.

Title: Re: Manual Hub not engaging
Post by: srozell on July 13, 2017, 09:58:11 PM

I never had a problem getting them out, but it's a good tip.