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Expert Answers about GMC Sierra


  • Availability of Class IV and Class V Trailer Hitches for a 2003 GMC Sierra 1500
  • There are a few different options to choose from depending on the style of 2003 GMC Sierra 1500 HD that you have. If you have a 10 inch Deep Drop Bumper I recommend the Curt # 13339. If you have the aftermarket Roll Pan Bumper I recommend the Curt # 13932. If you have a factory bumper then I recommend the Curt # C15323. The first 2 options are have 2 inch receiver openings but only have Class III ratings and are the only options for those styles of Sierra 1500 HDs. The 3rd option is...
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  • 5th Wheel Base Rail Installation Bracket Kit for 2011 GMC Sierra 3500 with 6-1/2-Foot Bed
  • We can help you with a 5th wheel installation bracket kit for the base rails you want to install in your 2011 GMC Sierra 3500 with 6.5-foot bed. It is generally best to stay with one brand of base rails and brackets to ensure a good fit. Mixing brands of rails and brackets is not recommended. Also, I do recommend using a custom kit that will reduce the amount of drilling and reduce the overall installation time. All custom kits appear on the linked page. If you have Curt rails you can...
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  • Suspension Enhancement to Fit 2002 GMC Sierra Denali Extended Cab with Quadrasteer
  • I confirmed with Timbren that the correct kit for your 2002 GMC Sierra Denali is # TGMRCK25S. It will fit with your extended cab and work great with the Quadrasteer.
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  • Recommended Parts to Equip Second Vehicle for Flat Towing Behind Motor Home
  • To set up a second vehicle for flat towing behind your MH you will need to get vehicle-specific base plates and possibly also a lighting solution, depending on what you're using. The same tow bar and safety cables can be used, as long as the second set of plates works with your tow bar, and possibly the supplementary braking system as well, if it is a portable type like the Blue Ox Patriot # BLU37TR. If you are using easy-install magnetic tow lights like # TLL21RK then these are easily...
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  • How to Select Replacement Cushioned Pin Box for Grand Design Momentum M349 5th Wheel Trailer
  • I checked the Grand Design website for details on the pin box installed on your Momentum M349 but they do not include that detail in their specs. Usually you'll find the pin box part number on the box's driver's side sticker. This is needed to select an appropriate replacement cushioned pin box that will bolt right up in place of the OEM model. You can use the linked page to select that OEM part to then see the compatible cushioned pin boxes, and cushioned pin boxes that also include a...
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  • 4-Pole Trailer Wiring Harness for 2002 GMC Sierra
  • If your 2002 GMC Sierra does not have a round U.S. Car connector to accept a 4-pole trailer wiring harness like # 118384 then it should have a bundle of wires tucked up above the spare tire (see the linked article, step 3, section B). The yellow wire is the left turn and brakes, dark green wire is the right turn and brakes, brown wire is for the taillights, and white is the ground. To these you can attach a 4-pole plug like # 18252, connect the wires color for color with heat shrink butt...
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  • Westin Step Bars and Replacement Step Pads for a 2001 GMC 2500 HD
  • If you are looking for replacement step pads, you seem to be describing the step pads for the Westin Signature Series step bars and for the E-series step bars. The replacement step pad for Signature Series step bars is part # 60-2108 and the replacement step pad for E-series step pads is part # 23-0001. You will also need step pads or 5 barrel clips, # 23-0002, for the E-series, # 23-0001, step pads. If you are looking for Westin step bars for your 2001 GMC 2500 HD, then we have a wide...
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  • Do I Need to Replace the Bearings When I Replace My Brakes
  • Wheel bearings are going to be hub and spindle specific and aren't going to effect which brakes you'll want to use. It sounds like you might have a 7k axle with 12" brakes on your trailer, so you can use the # AKEBRK-7R-SA (right) and # AKEBRK-7L-SA (left) which are a self adjusting brake assemblies and a great choice. These are sold as single assemblies and are side specific, so you'll need to order the brake for each side, or the complete set is available with part # AKEBRK-7-SA. You...
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  • Replacement Mounting Brackets for Westin Platinum Series Nerf Bars on a 04 GMC Sierra Single Cab
  • We do have the mounting kit for the Westin Platinum Series Oval Nerf Bars item # 21-1405 you referenced on your 2004 GMC Sierra 1500 Standard Cab. You will need the Replacement Mounting Kit for Westin E-series Nerf Bars 23-1400 item # 23-140PK.
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  • Is RoadMaster Stop Light Switch Kit # RM-751220 Required for GM Trucks with Adjustable Pedals
  • The RoadMaster Stop Light Switch Kit, # RM-751220, that you have referenced for GM trucks and SUVs that have adjustable pedals is required in order for the Roadmaster Even Brake Portable Proportional Braking System, # RM-9400, to work.
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  • Spare Tire Cover Needed for a Tire Size of 235/80-16
  • If you are looking for a white spare tire cover then we do have the Classic Accessories # 052963751703 which fits tires that have a 31" - 31-3/4" diameter. Since your tire size of 235/80-16 has a 30.8" diameter I am not sure how well this will fit though as it will be slightly bigger. Instead I recommend going with the Classic Accessories # 052963753875 which fits 30" - 33" spare tires so it will fit a little better plus it has a hook system to help create a tighter hold. I have linked...
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  • Is Wiring Harness Needed to Install Prodigy P2 Trailer Brake Controller in 2013 GMC Sierra
  • Your Tekonsha Voyager brake controller # 39510 probably installs in your 2013 GMC Sierra with a pigtail wiring harness # TM75127. Older units were hardwired. With this harness already in place in your truck your installation of the excellent Prodigy P2 brake controller # 90885 will be a simple plug-in process. The existing wiring harness will plug in to the back of the P2 with no other parts needed.
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  • 5th Wheel Tailgate Options For 2010 GMC Sierra 1500 Pickup Truck
  • We have a couple of fifth-wheel tailgates for your 2010 GMC Sierra 1500. One we offer is part # VGM-07-100. It is made of steel, and not aluminum. I have included a link to an installation video for this tailgate on a Sierra you can check out. The other is part # VGM-07-4000 which is made from a composite plastic material. We do not carry an aluminum tailgate for your truck at this time.
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  • Recommended Transmission Cooler and Parts Needed for Installation on 2011 GMC Sierra
  • For your 2011 GMC Sierra I recommend using a Derale 10,000 Series Stacked-Plate Cooler with -10 AN Fittings, like # D52510. I spoke with my contact at Derale and he said these coolers are popular among Allison transmission owners. When choosing a transmission cooler, the largest cooler that will fit in the space available in your engine compartment is typically the best. Generally speaking, the larger the cooler the better the cooler performance. A stacked-plate cooler is the most efficient...
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  • Trailer Wiring Harness for 1999 GMC Sierra 1500
  • Since you don't already have a factory connector on your 1999 GMC Sierra a 4-way trailer connector will need to be hardwired in. I suggest using the # C59496. It includes all the wiring and connectors you'll need. It also includes a circuit tester so you can find the correct wires to connect the harness to. The wiring on your truck will need to be probed to find the correct functions to connect into.
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  • Parts Needed to Install B&W Patriot in Bed of 2006 GMC Sierra
  • As long as your truck has industry standard bed rails installed in the bed like ones provided with the # BWRVR3200, all you'll need is the B&W # BWRVK3255 Patriot hitch. If you don't already have a 7-way installed in the truck bed, you can do so using part # C56000.
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  • Parts Needed To Flat Tow a 2013 GMC Sierra 1500 With ReadyBrake Tow Bar/Brake System
  • The Blue Ox Base Plate Kit # BX1674 will allow you to connect your ReadyBrake tow bar to your 2013 GMC Sierra 1500. You may need a adapter like the High-Low Adapter # RM-048-4 to help level your tow bars so they are not damaged by extreme angles. Most tow bar systems want to be within 3" of level to prevent damage to the tow bars. The Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 will provide you with the wiring and diodes needed to use the tail lights on your Sierra...
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  • Adapter Foot Assembly for Reese Elite Series Hitch RP30871
  • Reese part 58543 is a 2-piece kit of replacement base arches for their 26.5K Elite Series 5th wheel hitch # RP30871. My contact at Reese confirmed that kit # RP58419 is what you need.
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  • Parts Needed to Flat Tow a 2005 GMC Sierra 2500 with a Blue Ox Aventa LX Tow Bar
  • For your 2005 GMC Sierra 2500 you will actually need Blue Ox base plates # BX1660. These base plates are compatible with the Avail tow bar # BX7420. The tow bar comes with safety cables so you will not need to order any extra. But you will need a lighting solution and supplemental braking. For lighting, if you will not be towing the Sierra often I recommend a magnetic kit # RM-2120. But if you will be towing it often then I recommend a more permanent solution, the 4-diode kit # RM-154. And...
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  • Electrical Adapter for a 2008 GMC 1500 SLE
  • The electrical adapter, item # A75TB, converts an existing 7-pole plug to a 5-pole flat. Do you have a 7-pole plug on your GMC? If not, you will need to install a 7-way plug, item # 30955.
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