Supreme Suspensions - Differential Drop Kit for 2007-2021 Chevy Silverado 1500 / GMC Sierra 1500 4WD CNC Machined Diff Drop Spacers with High-Grade Hardware

Works great ! You’ll need some longer bolts but it fit well and did what I needed it to do.

bolts were too short

Overall the spacers do what they are intended to do; however, the bolts that come with the kit are too small for the new gen GM trucks. By a few inches that is. Rating = 6.5/10

Price was right. Spacers are well machined, consistent, and free of imperfections. All hardware was included, though of the wrong length (diameter and pitch were correct). The directions included, while well written and laid out, did not specify where to install the spacers (between diff and brackets or between brackets and frame). In either case, the hardware provided did not prove long enough for either option. I chose to space the brackets down from the frame (installing the spacers above the isolators). Hardware for my installation was 12x1.75 at 120mm. Keep in mind that I had to use 2 washers per bolt to prevent bottoming the threads as 120 is a touch long. I believe 100mm would work in this application, but 120's were on sale at Lowe's that weekend. Total cost was $4. Update to come after I rack up some mileage.

Great product. Worked as it should fairly easy to install. Can’t beat it for the price. Very affordable

Amazon says it's a confirmed fit for my 2021 Sierra 1500 (3L Duramax) as long as it's a 6-lug model, which it is. But my differential does not mount in a way that these spacers can be used. I emailed Supreme Suspensions, and they just said that it looks like I have an SU4 or SU5 differential. It's suspended from the frame by three large bushings. Now I'm returning this, but $6 will be deducted from my refund to cover return shipping. They say it will fit, Amazon says it will fit, and it turns out that it won't fit; but now I'm the one who's got to pay shipping if I want a refund? My advice, if you have a 19-21 Sierra 1500, crawl under there and make sure it can be dropped with spacers before wasting your time and money.

Great product

The bolts supplied were too short (60cm), should have been (120 cm) . I called Supreme suspensions and he said since I bought from Amazon I would have to deal with them, but he said the proper bolts are M12 x1.75x120mm. Just went Home Depot and bought (4) 1/2”x4-1/2” Grade 8 bolts,washers,nuts and applied loctite. Other than the bolts the spacers look good quality and lowered the front differential. If you’re thinking of buying this kit I would buy it directly from Supreme suspensions.