We all get a little smarter with age, and that includes ProComp too. They made a few design changes in this very popular kit that made it even better. The changes make it stronger and quicker to install. To start with, the redesigned front and rear crossmembers, that space the original suspension down, are one-piece laser-cut separate crossmembers. The original kit featured a 4-piece front and a 3-piece rear crossmember. Connecting all the parts makes for a much beefier connection to the chassis. They also strengthened the steering center-link drop bracket that connects to the stock GM Pitman arm and idler arm at the top and connects to the GM factory center link at the bottom. This stronger center-link is supported at the bottom (to the front crossmember) by dual heim-end "dog bone" links for total support during left-to-right steering movement.
The kit installed on this "91 Chevy also features a ProComp double-shock hoop that will mount dual monotube, adjustable MX6, ProComp Robbie Gordon Signature Series nitrogen filled shocks on the front and singles on the rear. So, you"ll be able to find your favorite "sweet spot" with these multiposition adjustable shocks.
Removing all the stock suspension parts including the front differential, upperand- lower A-arms and torsion bars is the easy part. Some cutting, grinding and welding is required before installation can begin. The large extension and compression stop brackets between the upper control arm mounts must be cut from the frame to make room for the new upper control arm drop brackets. The driver"s side rear wrap-around differential bracket gets removed along with portion of the inner lower control arm pocket. A new plate, provided in the kit, needs to be welded into the back of this pocket. This allows the front differential to be lowered and positioned in the new crossmember. The front anti-sway bar gets flipped upside down to lower it closer to the stock lower A-arm mounts. This way the stock end-links can still be used. The rear torsion bar cross member gets repositioned under the frame rails with lowering blocks provided in the kit. This lowers the rear position of the torsion bars to meet the new position of the front lower A-arms, where the other end of the torsion bars attach.
Another important feature about these lift kits is that they are alignment friendly. With the modifications made to this new kit, the upper A-arm alignment eccentric washers can be set at zero. This is accomplished, during installation, shimming the upper A-arm drop brackets to the frame until they are 90- degrees to the ground. It"s always a good idea to ask before you buy any kit, if it is alignment friendly.
The last bit of slicing-and-dicing has to be done on the exhaust header pipe. When the differential gets lowered, by the kit, the front driveshaft interferes with the header pipe"s stock location. A new header pipe is installed with a tighter bend. This places the driveshaft below the pipe. The slip-yoke in the front driveshaft has plenty of movement to reach the new lower position. With some other kits a new driveshaft is necessary.
To complete the new stance, new BFG rubber, LT315/75R16, on aluminum wheels were installed. With the new tires, lift kit and tightening the front torsion bars, the front came up a total of 9 3/8-inches and the rear went up 7 1/4- inches. No trimming to the front-or-rear of the front wheel well was necessary.
Like all the ProComp kits, the vehicle will retain its stock steering geometry and all the stock alignment capabilities, the stock front-and-rear track width, and the stock front torsion-bar and rear leaf spring ride characteristics. In brief, the ProComp brackets simply space the suspension down 6-inches along with the front differential and steering. At the rear, 4-inch blocks and one more leaf spring is added to make the vehicle sit level when completed.
Installing this lift kit could be done at home providing you have lots of previous lift kit installations under your belt - it"s just not a simple job! If you"ve never installed one before, have a professional off-road shop do it for you.
