Rough Country 256.20 - Manual (Page 2)

INSTRUCTION SHEET
Technical Assistance - (731) 285-9000 Page 2
9. Install new shock absorbers. 4” lift kits use 650329. 6” lift kits use 650341. Front upper uses spacer bushings /
sleever. The ½”sleeve will be installed on the bottom eye ring.
10. Install the wheels and tires on the front end.
11. Proceed to the rear installation instructions
REAR BLOCK INSTALLATION
1. Jack up the rear of the vehicle and remove the wheels and tires. Place the vehicle on jack stands. Position the
jack stands directly in front of the spring hanger on the frame.
2. Place a floor jack under the center of the axle and remove the stock u-bolts. Also remove the stock shock
absorbers. Lower the axle away from the leaf springs to allow for installation of lift blocks.
3. Install the blocks with the flat part of the block on the leaf springs and the narrow part of the block toward the
center of the vehicle Do not forget to install the block pin in the block for proper positioning
4. Install the new u-bolts and tighten to 80-100 ft/lbs.
5. Install the new shock absorbers Part# 650341. The 9/16” sleeve will be installed on the bottom of the shock
with the bushing and the pin will be installed on the top of the shock.
REAR LIFT SPRING INSTALLATION
1. Jack up the rear of the vehicle and remove the wheels and tires. Place the vehicle on jack stands. Position the
jack stands directly in front of the spring hanger on the frame.
2. Place a floor jack under the center of the axle and remove the stock u-bolts. Also remove the stock shock
absorbers. Lower the axle away from the leaf springs. Remove the stock leaf springs.
3. Install the new springs in the same manner as the stock springs were removed. Tighten the spring bolts and
jack up the axle to meet the leaf spring, paying close attention to the spring pin. Spring shim should be
positioned with the narrow part toward the center.
4. Install the u-bolts and torque to 80-100 ft/lbs.
5. Install the new shock absorbers. Part # 650341. The 9/16” sleeve will be installed on the bottom of the shock
with the bushing and the pin will be installed on the top of the shock.
TRANSFER CASE LOWERING INSTRUCTIONS
For ½ & ¾T 1980 and later model years on 4” and 6” lifts, the transfer case is lowered by using stock
mounting hardware on the transfer case cross-member.
1. Place floor jack under transfer case cross-member, raise jack until it applies pressure to the cross-member.
Remove stock mounting hardware.
2. Lower floor jack until there is enough space between the cross-member and the frame to install stock spacer
and mounting hardware per the picture. Tighten all hardware.
FRONT CONSTANT VELOCITY U-JOINT STOPS MODIFICATION INSTRUCTIONS
The stops on the front cv u-joint and the stops on the front drive shaft must be modified to obtain maximum
suspension travel on all 4” and 6” lift systems (see diagram below). These stops are designed to prevent the
drive shaft from contacting the road surface in the event of a u-joint failure at the front-end housing.
1. Remove the front drive shaft assembly from the vehicle.
Use a grinder or other suitable tool and remove the
amount of material needed to gain ample u-joint clearance
at the drive shaft stop. (Remove as little material as
possible). About 1/8” of material.
2. With the grinding completed, reinstall the drive shaft and
check the stop clearance by turning the drive shaft
Place sleeves here, between the frame and cross-member .
The sleeves may
be either on top
of the frame rail
or on the bottom
from the factory
as shown here.