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Mag-Hytec Differential Cover AA14-11.5

Differential Cover AA14-11.5
Fits: 2003-2015 Dodge Ram 2500/3500* | 2001-2015 GM 2500HD/3500HD
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Year Model Description Tech Notes  Capacity  Part #
You Need
2003-2015 High Output Diesels 2500 & 3500 trucks 14 Bolt - 11.5" Rear Diff Cover   8 Qts AA14-11.5
Year Model Description Tech Notes  Capacity  Part #
You Need
2001-2007 Silverado/Sierra 3500 8.1L 14 Bolt - 11.5" Rear Diff Cover   8 Qts AA14-11.5
2001-2015 Silverado/Sierra 6.6L Duramax (LB7, LLY, LBZ, LMM, LML) 14 Bolt - 11.5" Rear Diff Cover Full-Floating Axle 8 Qts AA14-11.5

Full floating Axel


  • Magnetic drain plug and anodized aluminum dipstick with magnetic insert
  • O-rings require no gaskets or sealant
  • Routine lube maintenance without removing the differential cover
  • 1/8 NPT temperature sender port
  • 303 stainless steel hardware
  • Lube level reference plug
  • Finned aircraft aluminum housing
  • Requires allen key wrenches (included) for installation and service
  • Fits with most factory suspension systems and aftermarket anti-sway bars

Dodge Rear 2003 to present. High Output Diesels 2500 & 3500 trucks
Unless it is a 2014-2015 2500 with coil springs.

2001-2015 GMC / Chevrolet HD 2500 & 3500 6.6L Duramax
Comes with LIFETIME limited warranty!

NOTE: This is the correct cover for your 14 bolt - 11.5" differential, even though there are only 12 bolt holes. The top and bottom bolts have been removed for the drain plug and temperature sending unit hole.
NOTE: Fits Ram models with leaf spring suspension only. Will not fit late model trucks with factory coil springs or airbag suspension.

The Mag-Hytec AA 14-11.5 rear differential cover is cast in A356-T6 aluminum and texture powder coated black with contrasting machined cooling fins, the Mag-Hytec differential cover boasts increased fluid and cooling capacity, a magnetic dipstick for checking fluid level and checking metal particulate, a magnetic drain plug, a fluid level reference plug, as well as a temperature sender port in 1/8"NPT. All Dipstick, drain plugs and reference plugs are MS 33649 and fitted with ARP 568 O-rings for superior sealing. All fasteners are T-303 stainless steel. The cover seal is a dovetail groove mounted ARP 568 O-ring that requires no sealant or gasket. It can be removed and reinstalled several times without replacement.

Application: American Axle 14 Bolt 11.5" ring gear - Dodge Rear 2003-2015 High Output Diesel's 2500/3500 trucks. - GM 2001-2015 HD 2500 & 3500 Duramax & 8 Liter Gas.

Fits the rear differential on some 2003 and newer Dodge Ram 2500 and 3500. These models may have a 10.5-inch or an 11.5-inch ring gear. Check the identification sticker in your glove box or on your driver's door to determine which differential you have.

Mag-Hytec AA14-11.5 Differential Cover
(Dodge & GM) Full Floating Axle GM Hd 2500 & 3500 2001 & Up, Duramax & 8.1 Liter Gas/Dodge Rear 2003 & Up 2500-Automatic Standard Diesel
Mfg # AA14-11.5

Warranty Info:
All Mag-Hytec products are covered by a lifetime limited warranty
to the original owner against defects in parts and workmanship.
O-rings are covered for five years.

Total Capacity - 8 Quarts

AA14-11.5 installed
Product Description Price Order
AA14-11.5 Differential Cover
Fits: 2003-2015 Dodge Ram 2500/3500* | 2001-2015 GM 2500HD/3500HD
Capacity: 8 Quart
Overall Height: 3 5/8"

Mfg Part # AA14-11.5
Our Part #
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