STEALTH CONVERSIONS COLORADO LOWERING BLOCKS
lowering blocks are made of solid (billet) aluminum.
The Chevrolet Colorado uses different lowering blocks than most other vehicles. For example, lowering blocks from an S-10 truck will not fit properly on the Colorado. An S-10 truck uses a 9/16" diameter alignment pin, and the Colorado uses a 15/32" alignment pin on 2004-2008 models, and 15mm on 2009 and newer models.
The Stealth Conversions lowering blocks for the Colorado are unique in that the lower hole
is 15/32" for 2004-2008 Colorados and 15mm for 2009 and newer trucks. The upper hole is threaded to accept a
socket head cap screw, which has a 15/32" diameter head for 2004-2008 Colorados and a 15mm head for 2009 and newer models. This design allows
bolting pinion alignment shims on top of the lowering block, as well
as bolting 1/2" thick lowering blocks 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 Stealth Conversions lowering blocks are available
in 1/2", 1", 2", and 3" thickness. The solid aluminum
lowering blocks cost a lot 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, and are more versatile than
extruded or cast lowering blocks because they can be used with pinion alignment shims, and the amount of lowering can be adjusted in 1/2"
increments by bolting the 1/2" block to a 1", 2" or 3"
If you only want to lower the rear 1/2", you can
install the 1/2" lowering block directly to the leaf spring in
the same manner that the pinion alignment shim is bolted to the leaf
Generally, lowering blocks taller than 3" (with
15" rims) are not recommended because this positions the lower
spring bracket below the rim line (also called the "scrub line")
and this is illegal in many states, because if the tire loses air, the
bracket will drag on the ground, causing the vehicle to lose control.
Stock U-bolts Stealth Conversions extra-long U-bolts
U-Bolts for Colorado, included with lowering kit
The Stealth Conversion's U-bolts for the Colorado are made specifically for the Colorado. The Colorado uses an axle tube that is 3-3/16" diameter (compared to 2-3/4" on an S-10 Truck, or 3" for most full-size trucks).
The Stealth Conversion's U-bolts are made from 9/16" diameter steel, instead of the 1/2" diameter normally used by other manufacturers. The 9/16" diameter U-bolts cost a lot more than the 1/2" diameter U-bolts, but they are worth it because they are much stronger, and they can be reused, unlike the 1/2" diameter U-bolts which often fail when installed more than once.
The "Hi-nuts" used on the Stealth Conversion's U-bolts are much longer than normal nuts, and they resist stripping far better than normal nuts.
You can purchase our Stealth Conversions heavy duty U-Bolts separately, in sets of 4 including the Hi-nuts and heavy duty washers.
Torque these u-bolts to 85 lb-ft.