My son wants to lift the back of his 2006 f-150 4x4- 2"s. can he stack a 2" block on top of the block that's already in there, or does he need one solid block? Was also wondering if you can stack them, would the 2" block I took out of my 87 f-150 4x4 fit on top of the block he has in his 2006.

 

Not a good idea to stack blocks and blocks will also promote axle wrap. An all spring lift is a better way to do the lift and will ride better.

 

I was down at the ford dealer and they have a few new lifted trucks for sale,I looked at the rear leaf set up and they just added a block under the factory one. I'll phone the dealer tomorrow and ask about that

 

Just because people do it doesn't mean it's done the right way. Ronin is right. A spring lift is much better than a block lift, ESPECIALLY if you just stack blocks on top of each other.

 

If you are going to stack blocks (which I don't recommend) you have to realize that there are special blocks that have some kind of interlock system so that they don't shift and spit out. I still don't trust them and as I said before, blocks promote axle wrap. I would really look at getting different rear springs. You will be happier with the outcome besides being safer, better handling, and IMO better looking.

BTW, whatever you do don't use blocks in the front!! You may already know this, but I want this in here for someone who may not know. It is dangerous and illegal. Nothing like having your front end collapse while going around a corner when it spits out a block.

 

If you do use the blocks (not recommended) they need to have an angle cut in them to help align the driveshaft. The wrong shaft angle will only cause more problems later.
Tim

 

stack em and weld em together, dont leave em 2 seperate pieces. If the rear springs are 3" wide then 86-97 F350s will have a 4" block from the factory. Theres nothing wrong with a 4: block...but there isnt anything good about a 4" block either.
As far as special interlocking yadda hoopla....its called a locating pin and all blocks made for any between leaf/axle application will have them...just depends what the pin size is.
Yes all spring lift is better, many 80-96/7 Fseries had a thin single rear overload spring with lost of arch that will lift the rear if use in the pack as an Add A Leaf...but ride will stiffen.

 

Stacking is still not a good idea. Welds could fail. Locating pins were designed to locate a single block between the axle and leaf as you mentioned, but not between two stacked blocks. A single solid 4 inch block is better, but you will still get more axle wrap than the current 2 inch block he has now.

I just don't see the value in being cheap on this when we are talking safety here. If it has to be done on the cheap then buy a true 4 inch block if that is what you need. Don't stack them.

 

duplicate post

 

we had 6" blocks in an OBS F250 with some ladder bars the axle wrap was virtually all gone...before the ladder bars that thing bounced like a jackhammer tho. My F350 with the 4" blocks bounces pretty damn bad too.

 

[QUOTE=Ronin007]Stacking is still not a good idea. Welds could fail.

NOT IF DONE RIGHT!

 

Stacking is not a good idea, period.

 

re: welding blocks

I have never seen a welded set of blocks fail, even on tractors (trailers). If they are both steel, I would weld them and not think 2x about it.