DearChan Transfer Case Pump Upgrade Kit for GM 1998-2007 (Models 136–263) — Aluminum Housing & Seal Repair Parts

The DearChan 10001 Transfer Case Pump Upgrade Kit is a complete replacement kit designed to eliminate pump rub and prevent catastrophic fluid loss on compatible GM transfer cases from 1998–2007.

If you own a GM vehicle with a transfer case model 136, 146, 246, 261, 261HD, 263HD, 263XHD or 261XHD produced between 1998 and 2007, this kit gives you the parts needed to upgrade the pump interface and improve sealing where pump rub is a known failure mode. Note: this kit does not repair existing cracked housings — it prevents the rubbing condition that leads to future failures. Professional removal and disassembly of the transfer case is recommended for correct installation.

How does this kit stop pump rub and fluid loss?

The kit replaces and reinforces the pump housing interface and related seals so the pump no longer contacts the case in ways that can wear through material and cause leaks. It provides a stiffer, precision-fitted housing and improved gasket/sealant materials to keep fluid contained under operating conditions.

• Aluminum alloy pump housing for better rigidity and resistance to wear.
• New adapter gasket to restore a flat, even mating surface.
• RTV silicone and blue threadlocker to secure fittings and seal joints.
• Parts manufactured to OEM-equivalent specifications for correct fit.

What parts are included and what is NOT included?

The DearChan 10001 kit comes as a complete upgrade assembly focused on the pump housing interface and sealing components, but it does not include the transfer case or the pump itself. It’s intended to be used alongside a repaired or replacement pump when addressing pump rub issues.

• Included: transfer case pump housing (upgrade design), adapter gasket, RTV silicone, and blue threadlock.
• Excluded: original pump unit and full transfer case assembly are not supplied.
• Installation requires transfer case removal and disassembly.

Will this fit my vehicle and how do I confirm compatibility?

This upgrade kit is engineered specifically for GM transfer cases with model numbers 136, 146, 246, 261, 261HD, 263HD, 263XHD and 261XHD from model years 1998 through 2007. Confirm by checking the transfer case model stamped on your housing or your vehicle service documentation.

• Check the transfer case model number on the housing or service manual.
• Compare model and year range: 1998–2007 only.
• If unsure, consult a drivetrain specialist or include vehicle VIN when asking for help.

How durable is the upgrade and what materials are used?

The components are built for longevity using an aluminum alloy housing and high-quality sealing materials to resist corrosion and wear. Assembly materials were selected to match OEM performance so the upgraded interface sustains normal operating loads and resists the modes that cause pump rub.

• Aluminum alloy housing for strength and corrosion resistance.
• Durable gasket and sealant to maintain fluid containment.
• Threadfixing glue (blue threadlocker) to secure fasteners against vibration.

Who is this for: The DearChan 10001 Transfer Case Pump Upgrade Kit is made for DIY mechanics, professional technicians, and fleet maintenance shops addressing pump rub issues on compatible GM transfer cases. It’s ideal when you want a long-term prevention solution as part of a transfer case rebuild or pump replacement — especially for vehicles that have not suffered housing cracks. If your transfer case already has a cracked housing, this kit should be used during a proper repair to prevent repeat failure, not as a standalone fix.