How to install rear blocks
Will need two 2” rear blocks, 8 nuts along with 4 u-bolts which are 2” longer than the original u-bolts, and two shocks which are approximately two inches longer than the original shocks.
- blockers for one or both front tires
- Torque wrench (need 100 Ft/lbs)
- Socket set for larger bolts and socket wrenches (air tools make job easier, will need air compressor and air ratchet wrench)
- 4 jack stands, hydraulic jack
- Red loctite
- Breaker bar
Instructions are for both sides. Do same step to both sides.
1) Put e-brake on and block front wheels.
2) Break the nuts on the wheels but leave snug until vehicle is jacked up.
3) Jack the rear end up using the hydraulic lift in the middle of the rear differential on a flat surface until the tires are slightly off the ground.
4) Place jack stands under the frame rail on each side. Lower the jack on the differential until the frame sits on the jack stands and make sure they are secure on the frame.
5) Remove both rear tires.
6) Lower the hydraulic jack until it is just barely holding the axle up to relieve the pressure on the leaf springs, but do not have it loose contact with the rear differential. Be careful, the springs will jump if there is still pressure on them.
7) Remove the u-bolts that hold the leaf springs on the axle. Set the lower brace that comes off when you remove the nuts on the ground indicating which way it came off.
8) Remove the original shocks (lower jack on differential if shocks are not stretched completely.
9) Place support block or jacks on each side of the differential near the rotors in order to keep axle level and prevent it from rotating. I moved the hydraulic jack that I had on the differential and used the jack that came with the truck (if you do this make sure you support the axle so it doesn't fall while moving the jack)
10) Lower the axle onto the support blocks or jacks so you have enough room to place the rear blocks between the leaf springs and axle.
11) The rear blocks have pins on the bottom that fit into the small holes in the axle and the blocks also have holes for the pins on the bottom of the leaf springs to go in. Place the blocks on the axles with the pins in the holes as shown with the bump stop pointing toward the differential.
12) When they are in place jack the axle up so the pins fit in place on the bottom of the blocks and on top of the blocks. May need to bump the axle or blocks in order for the pins in the leaf spring to go into the holes on top of the blocks.
13) Keep raising the axle until pressure is put on the leaf spring (make sure the truck does not lift off the jack stands supporting the frame). Once pressure is put back on the leafs springs put the lower brace back on using the longer u-bolts and the nuts that go with them. Tighten the bolts until they are snug.
14) Apply RED loctite to the u-bolt nuts and use torque wrench to tighten to 100 ft/lbs in 3 steps - Tighten nuts to 50 ft/lbs, then to 75 ft/lbs and then to 100 ft/lbs.
15) Install the new shocks. May need to compress them in order to place them where they bolt on.
16) Mount the wheels back on the truck and snug up the lug nuts. You may need to jack the truck up more since the 2” block lowered the axle. Once the lug nuts on both wheels are snug, lower the truck back onto the wheels removing the jack stands and jack. Tighten the lug nuts to 150 ft/lbs of torque.
17) Remove the blocks that are holding the front tires.
Here is a before and after
Moved to suspension
Looks good! Nice write up. What is the difference in ride height?
Can you re use the shocks ? Or will then be to short after the new block is in
Mine is a 2wd so with the front level it is a little higher then a 4X4 and with the back block it sits as tall as a 4X4. So basically just a little taller than a stock 4X4
I replaced my shocks because I wouldn't have enough room in them and they would have blown out while driving off road so I just decided to replace them at the same time. You might be able to get away with using the same shocks though.
Thanks for the thread, nice photos of the process.
Did you measured the difference?
these 2 inch blocks are stock from factory on the average sc xlt 4x4 correct?
if so could i replace them with 4 inch blocks and shock extenders or longer shocks for a little more lift/clearance in the rear?
when i bought this truck, it already had a circular aluminum looking leveling block kit up front which probly equates to 2-2.5 inch lift which i may replace with bilstein coilovers since i hear this type of leveling kit is bad for balljoints, axle half shaft alignment etc etc.
i plan to put aggressive 35s on before next hunting season so any cheap clearance/lift i can get will help with fitment/rubbing issues
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