6in lift kit for 1969 F100

[usmcjones1988]

I was wondering if i can use the 3in wide block from my lift kit if my springs are only 2.25in wide?

[usmcjones1988]

Also if they wont fit would it be possible to machine my own block, I have access to welding/metal fab shop?

[forrestbump]

So that I'm understanding your question, are these rear lift blocks 3" in WIDTH - or -3" in HEIGHT - or - 3" in BOTH measurements?

If the lift blocks are wider than your leaf springs, they're also wider than your leaf spring anchor plates. That will mean the U bolts will NOT be oriented correctly, they'll be splayed out at the bottom and I'd advise against doing this.

Since you DO have access to a machine shop, just make your own out of solid steel stock with the appropriate sized hole at the top of the lift block for your leaf spring pack pin to sit in and an allen head bolt threaded into the bottom for registration into your axle's leaf spring mounting perch.

You'll also need longer U bolts and plan on increasing the length of your drive shaft, not to mention the axle housing wind up and that your U Joints will NOT like the new angle they'll be turning at.

Can you tell I've done this? Ultimately returned my 4WD back to stock height due to constant U Joint failures.

[Doug Comer]

If you do make your own lift blocks, don't forget to make them wedged shaped that way it will correct the drive shaft angles.

[usmcjones1988]

if i were to switch to 3 in springs i would have to drill my frame to relocate the hanger right?

[forrestbump]

if i were to switch to 3 in springs i would have to drill my frame to relocate the hanger right?

I'm assuming you're referring to converting to rear leaf springs that are 3" in width, correct?

If so, YES, you'll have to change all 4 of your front and rear spring hangers. If your getting these 3" width leaf springs from a Ford donor truck, also get the shackles too as those will need to be changed as well.

Start by measuring everything on your truck and the donor truck as follows: Wheelbase, Spring Hanger location relative to where they're attached to the chassis, pinon angle, shock mount location, emergency brake cable routing and rear chassis width. This, again, applies to BOTH trucks. If the 3" width springs are on a 1973 to 1979 Ford truck, you'll also have to change the spring pads on the later model axle housing if you're going to use it. On a one to ten degree of difficulty scale with ten being the worst, I'd call this conversion a solid Five so you've got your work cut out for you.

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