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Old 04-13-2016, 08:30 PM   #1
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1992 29' Excella
2010 22' Interstate
Van By The River , Georgia
Join Date: Feb 2002
Posts: 1,522
4 X 4 Transfer Case "Pump Rub" NP246, NP261 and NP263

There are probably many Air Forums members who tow with late 1990's to mid 2000's GM trucks with New Process / New Venture transfer cases.

If you have a 1/2 ton or 3/4 ton 4 X 4 vehicles in you should be aware of "pump rub." I recently experienced this problem and I think I corrected the issue before any long-term damage was done.

Here are two links to solutions to the "pump rub" problem.

https://www.merchant-automotive.com/t-gastruck.aspx

http://www.riversidegear.com/4x4-tra...s-kit-now.html

And a link to a PDF file describing the fix as well as a links to a YouTube videos showing installation of the two common fixes

https://www.merchant-automotive.com/tech/tcpv2.pdf



So here are the details for my recent situation.

I was at the local dealer for periodic service (aka oil change). I go to the dealer because they charge less for an oil change than I can do it for myself and they notice potential issues that I might miss.

On this particular visit the service technician mentioned he saw evidence of an oil leak. He was not very specific and I didn't ask any questions because I thought the leak(s) were from the usual rear main seal and the transmission pan. I knew both areas leaked but neither of them were serious IMO.

A week later we towed the Airstream about 500 miles from home and immediately noticed a light spray of oil on the front of the trailer. The oil slick worsened as we traveled and by the time we were home the residue on the trailer was all the way to the rear bumper of the trailer. I had checked the engine oil and transmission oil but neither needed to be topped off. I didn't check the transfer case and ultimately that was the location of the problem.

The dealer didn't mention pump rub but GM is definitely aware of the issue and has distributed a technical service bulletin but has stopped short of a recall because the problem doesn't typically exhibit itself until 80 - 100 k miles and many years. Our K2500 Suburban is 11 years old and has just shy of 100k miles.

So be forewarned. You may not catch your problem in time. If the transfer case loses all it's oil you'll be looking at many $$ for the repair.

I did the repair myself using the Merchant Automotive kit. All the parts were under $500 and it took me about 7 hours in the driveway with a little help from a "car" buddy.
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Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...
nvestysly is offline   Reply With Quote
Old 11-05-2016, 02:18 PM   #2
Rivets?
 
nvestysly's Avatar

 
1992 29' Excella
2010 22' Interstate
Van By The River , Georgia
Join Date: Feb 2002
Posts: 1,522
Here's an update ~114k miles...

It's been about 14,000 miles since I installed the kit to repair the pump rub problem. So far, so good. We've towed in parts of the Appalachian as well as portions of the Rocky Mountains. In fact, most of the 14k miles since the kit was installed have been towing miles.

I know there are lots of Air Forums members towing with K-model GM trucks and SUV's so be aware. Pump rub can come on quickly and can be catastrophic.
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Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...
nvestysly is offline   Reply With Quote
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