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Transfer Case

joe2705

By joe2705
in Ask A GM Technician

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joe2705 Enthusiast

joe2705

Posted
Posted

Hi!

I have trouble with my Transfer Case.It hase a pinhole worn in the back of the case.I heard that this is a known problem.the transfer case is a NP261.i have a spare NP241 would that fit on the Truck.

2005 GMC SierraHD 6.0l

 

thanks for any advise.

5Alive Enthusiast

5Alive

Posted
Posted

Your's is only 3 years old... a 2005. My first move would be to see if you can find a dealer that will fix the problem for you under their customer goodwill warranty. This is absolutely a material design defect. One shouldn't have to replace a $1,800 transfer case in a supposedly "HD" truck in only 3 years.

 

There is PLENTY of information and user reports on this issue over at www.thedieselplace.com . GM and New Venture Gear already know about the problem, and even made a new style clip that retrofits inside. You can install GM's new clip once, along with a new case back half, once you've torn the case apart. Or maybe you'll want to go with an aftermarket fix such as the one offered by Merchant.

 

As for the 241 spare case you already have, I at first was going to ask whether or not you kneo if it was an 241HD or just a 241, since the Torque capacity and GVWR is different between those two, and you'd probably want to match the Torque capacity and GVWR of your hole riddled 261 as much as possible. But then I realized that we don't know whether or not you have a 261 or a 261HD, or a 261SHD for that matter. But we do know that your engine is only a 6.0L, which isn't the torque monster that the 8.1 or 6.6 diesels are.

 

So, rather than guess, I'll just post the Torque and GVWRs for four of the transfer cases (betting you don't have the 261SHD Super Heavy Duty), and you can determine which transfer case you have, and which replacement will best match what was designed and intended for your chassis.

 

Case_____Max Torque_____Weight_____GVWR

 

241______5,555 lb-ft_______80 lbs._____8,800 lbs.

241HD____5,555 lb-ft_______100 lbs.____11,000 lbs.

 

261______2,564 lb-ft_______69 lbs._____7,200 lbs.

261HD____5,430 lb-ft_______77 lbs._____10,000 lbs.

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