Lowering Block Alignment Kit

Why You Might Need One. Lowering blocks kits work with alignment shims that adjust driveline angles on swaps. Our lowering block kits include the required heavy-duty U-Bolts, Hi-Nuts, and extra thick washers.Why JTR Stealth? Stealth Conversions' rear suspension lowering kits use lowering blocks made of solid (billet) aluminum. The lowering blocks are unique in that the lower hole is 9/16" and the upper hole is threaded to accept a 3/8" socket head cap screw, which has a 9/16" diameter head. This allows bolting the axle alignment shims on top of the lowering block, as well as bolting our 1/2" thick lowering block to the 1", 2", and 3" lowering blocks in order to make 1-1/2", 2-1/2", and 3-1/2" lowering blocks. The solid aluminum lowering blocks cost more than most other lowering blocks because of the high cost of solid aluminum, and the additional machining required to tap the hole, but they will not fail. They are more versatile than extruded or cast lowering blocks because 1) they ca