Transfer Case Oil Pump Rub Fix with NV273 Conversion / Upgrade for Electric Shift NV263XHD
An NV273 is a beast compared to the original Duramax transfer case. The entire case is stronger, upgraded aluminum compared to the cheaper magnesium on the original NV263XHD transfer case. If you already destroyed your transfer case due to the oil pump rub problem on the the Electric Shift 263XHD, now is the time to upgrade! The Speed House NV273C has roughly double the GVWR of the OEM NV263XHD and it is the ideal companion to any Solid Axle Swap kit (Solid Axle Conversion kit), SAS or SAC for short since it already has a built in slip yoke eliminator on the front AND rear output shafts!
For folks that have no intention of swapping in a Dana 60 or any other solid front axle, there is still very good cause to swap in the Speed House NV273C transfer case! The original 01-07 Duramax transfer cases have a pretty serious flaw with the "oil pump rub issue" and make the otherwise robust and long lasting drivetrain a joke. We decided that Duramax owners needed an option at least as good as Powerstroke and Cummins owners for their transfer case so we designed a kit to swap in the NV273 that not only fixes the inherent weaknesses built into the original Chevrolet and GMC transfer cases that came in your Duramax but totally eliminate them!
IMPORTANT NOTE(s):
- There is a refundable CORE Charge BUT... we will accept your 263XHD as a core!
- The Round Trip Shipping is for the 48 continental USA - This includes shipping the New case to you and for the Core returned to us!
- The NV273C has fixed front and rear output yokes and will require new drive shafts or drive shaft modification
- The ABS brake module on the driver side frame rail will need to be re-located rearward approximately 12 inches due to the sheer size of the NV273
- Use five pieces of 5/16"x12" inverted flare brake lines from most any auto parts store (roughly $20)
- Use five 5/16" female x female inverted flare couplings from most any auto parts store (roughly $10)
- You will need to power bleed the brakes, or have it done, after moving the module
- You will re-use your original shift motor - be sure to remove it from your NV263XHD core before you send it back!
- Depending on the cab / bed combination you may need to extend the transfer case sensor harness / shift motor harness 4 to 8 inches
More on the Oil Pump Rub Issue in the Original Duramax NV263XHD
If you have a 2001 to 2007 Classic Chevrolet or GMC 4x4 truck with the Duramax and Allison transmission and the electric shift NV263XHD transfer case, your oil pump WILL end up wearing a hole in the rear case half and the oil will slowly leak out oil until it literally grenades when you least expect it. Often the oil leaks are so tiny you will never even see a drop on your driveway but the oil mist escaping the small hole will still run it dry as you drive!
If you have one of these trucks your transfer case WILL end up wearing a hole in the case and slowly leaking out oil until it destroys itself... usually when it is not convenient for you to be stuck! Remember, many times the oil leaks are so small that only vapor is blown out and you will never even see a drop on your driveway but the oil mist escaping the small hole will still run it dry!
So how can we be sure that is not a matter of IF but WHEN this will happen to YOU? Well, while driving (EVEN in 2 Wheel Drive Mode) the oil pump pushes oil against the rear case and slowly wears on the soft and inexpensive magnesium case material. That wear slowly causes pin-holes to develop in the soft and thin magnesium shell. Over time the oil evaporates out of the transfer case or is spent as a fine vapor. This happens very gradually; so much so that you probably will not realize it until it is too late and you hear your transfer case getting noisy. At that point there will have been damage done to the internal components of your transfer case and it will require a full rebuild. This is what is referred to as the "oil pump rub" problem.
READ FULL DETAILS HERE
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