I'm confused with all the information I've received regarding a suspension upgrade I would like to do.


First, if you have a Pro-Comp 6" Lift, you can probably help me the most.


I currently have Pro-Comps Add-A-Lead system on the back of my truck. It's supposed to give me a 2-2.5" lift in the rear. I also have a Pro-Comp 2.5" Level up front. The front level, coupled with the Heavy Service Springs up front make my truck perfectly level (to the millimeter) front and back.


I like having a rake to my truck, so I purchased some 2014 F350 3.78" OEM blocks from another member.


Here is the technical part.


The truck that the blocks came off of was the exact same as my truck (CC, Short Bed, SRW) except it is an F350 vs my F250.


My replacing my OEM 2" blocks with my new OEM 3.78" blocks PLUS the Pro-Comp Add-A-Leaf springs I already have should net me a lift of 3.87-4.25" in the rear (which I think is the rear lift that comes with a ProComp 6" kit..... 4" block plus add-a-leafs).


I have a 1-piece Driveshaft and already have Skyjacker M95 Shocks designed for 2-5" lifts on my truck. The F350 blocks have a VERY VERY VERY VERY slight tapper (less than 3mm slope on each block).


Can I just install the blocks and longer u-bolts or will I need a Driveshaft spacer? or anything else?


Basically, I'm trying to figure out if a 4" Rear lift will require anything special to keep from having issues.


Pro-Comp, BDS, and Readylift tech support say the blocks are good and I wouldn't need different ones....so that's a relief.


Any advise would be much appreciated. Preferably educated advice that is.

 

I would install the 4" block, and then measure the transfercase/driveline/pinion angles and if they are in spec your good to go. If not, then get the blocks with the angle needed to correct.

There is no driveshaft 'spacer' for a single shaft setup. Only way to adjust driveline angle is with lift block angle (or move trans/tranfercase x member, which is an 'involved' modification).

 

I have the F350 blocks (stock) and 2.5" carli add a pack leafs and there is no issue. CC SB 1 piece drive shaft. I believe you will end up the same. Nothing else done to the driveline. Over 100,000 miles. Wheel is off center in the wheel well.

Thanks

 

Done... And happy with the ride and results. Nothing negative to speak of.