Severe drivers side lean

I know there has been multiple posts on this but I wanted to get some insight into my specific issue.
My 2001 sr5 4x4 Access cab has some pretty bad lean on the drivers side. I purchased the truck used and it came with stock rear suspension (220k miles I have 5100s on the way) and rancho leveling struts on the front.
The front initially sat .75 inches lower on the drivers side, while the rear sat 1.25 inches lower. As a test, I installed a 1.5 inch block on the drivers side rear. This brought the difference in the rear to .5 inches and the front basically sat level (a little less than .25 inches to the drivers side).
I assumed that the drivers side leaf spring was sagging so I replaced it today. I also added a .25 inch spacer to the drivers side. After doing this the rear is still leaning 1.25 inches. And the front is now leaning about .6 inches.
My next thought is that maybe the lean is being caused by the rancho shocks. I have 5100s on the way with OME 2884 springs.
Is it possible that the front shocks could be causing such a drastic difference in the rear?
My plan is to install the 5100s in the front along with the .25 inch spacer on the drivers side. If the lean is still present, is it safe to install a spacer block on just the drivers side rear?

 

Just so you’re aware, the OEM springs are position specific as the left front is actually longer than the right front. It sounds like your front springs have been crossed or the Rancho ones are just equal length left and right.

Get the 2884s on and then assess the situation. As long as they are installed properly, I bet your problem will be solved or at least better.

Don’t do anything stupid like run a block or a spacer just on one side. If you think you need to do something with the rear, replace the rear leafs together.

 

I completely agree with Mamba's post, except...It seems accepted around here to go with a small front spacer on one side to help with lean. No bigger than 1/4", as you mentioned. 1st Gen Offroad sells one. I'd think that if you replaced the leaf springs and coils and shocks front and back, the problem would be gone, but just in case...

https://www.1stgenoffroad.com/store/p1068/1stGenOffRoad.comStrutSpacer.html#/

The only situation I can see where it makes sense to replace leaf springs on only one side would be with a truck no more than 5 years old, if you somehow broke a leaf on one side. At 20+ years and 200,000+ miles, the both need to be replaced.

 

Agree. I run Bilstein 5100s with OME 2885s and the 1/4" spacer up front. Pretty darn even driver to passenger side.

 

Thank you everyone for the input, I will update you guys once I install the new shocks this weekend.