passtim

Rear blocks are so cheap that why run the risk of stacking them, unless theyare steel and can be welded together.

brihvac

I came up with nothing but some guys like you saying not to do it. No reason why, or examples of what could happen. I had stacked blocks on a 01' F350 crew cab long bed diesel with 6" lift for 200K miles and never had any issues. Used to have it on some pretty nasty roads while deer hunting, towed heavy construction trailers on a regular basis and it operated flawlessly. BTW I do not have stacked blocks on my F150. Mine is a steel 4" because I had it. However I wouldn't hesitate one bit stacking the RC block that came with the kit. Its a small block with the 4" kit. If you get the 6" kit you do not stack them; they give you a large block.

passtim

Op, good luck finding a good shock. As I stated earlier, the 5100 should work I n your application without overextended As to arguing about stacking blocks, if your comfortable going that route then I hope it works out for you. It’s not all about just your safety, but the others on the road with you.

M0RRIS

Stacking isn't recommended because if a heavy torque load is applied or any extream off roaming is done you can fire a block out the back and you're screwed.

I would do one larger block like others have said or just do an AAL.

JerseyGray

I had 5100s but one leaked after 2 years so I got a set from HaloLift. Very nice shock.
I have an add a leaf plus 3 inch blocks.

techrep

iTrader: (1)

Stacking blocks is not the proper way to lift the rear end.. springs are... that’s what holds up the the rear end.. too tall of blocks or stacked blocks may cause axle warp...

SteveLord

Beat me to it. I wouldn't stack larger, but RC's setup is time tested and outweighs baloney from doomsayers.

WarSurfer

Just get a one inch lift shackle. They are like $50 and WAY easier to install.

techrep

iTrader: (1)

^^this too^^

Somd FX4

where could I get a set?