67 C10. 3/5 drop question

[DNGR]

My Truck has a CPP 3/5 spring drop. Next, I want to do the 2.5 drop spindles with the disc conversion. My question is will I need to change the. Rear springs to make the truck level?

[SkidmoreGarage]

There are a lot of variables here, to say what you need for certain. However, you likely won't need to replace the springs. You could do an axle drop to level it out, just figure out how much you need and buy it. When you get to 7" of drop, there isn't much travel left, FYI.

[Mike C]

On a coil spring truck it’s easier to get a little more drop using blocks. That’s what I would do. My leaf truck is dropped 4.5” in front and 7” in the rear with no C-notch. Once you do the front, decide how much lower you want to go in the rear and just buy the appropriate block.

[DNGR]

Thank you guys for the helpful info!!

[SCOTI]

Good suggestions.

I'll add, drop blocks are an easy way to get additional drop. But there are consequences if getting aggressive. Drop blocks beyond 1" in height can put the rear axle scrub-line below the wheel lip if using 15" wheels. In the event of a serious tire failure, the U-bolt ends can make contact w/the road surface. Like dropping an anchor, it's not a big deal if moving unless it catches something or digs in. Wheels w/a larger diameter change the scrub-line dimension offering more wiggle room for a taller block w/o the possible contact concern.

This is just something to be fully aware of when it comes to different lowering methods.

[DNGR]

Originally Posted by SCOTI

Good suggestions.

I'll add, drop blocks are an easy way to get additional drop. But there are consequences if getting aggressive. Drop blocks beyond 1" in height can put the rear axle scrub-line below the wheel lip if using 15" wheels. In the event of a serious tire failure, the U-bolt ends can make contact w/the road surface. Like dropping an anchor, it's not a big deal if moving unless it catches something or digs in. Wheels w/a larger diameter change the scrub-line dimension offering more wiggle room for a taller block w/o the possible contact concern.

This is just something to be fully aware of when it comes to different lowering methods.

Thank you, So a larger wheel may help as I go lower.

[68 P.O.S.]

Is it level with the current 3/5 drop?

[DNGR]

Originally Posted by 68 P.O.S.

Is it level with the current 3/5 drop?

Good question, I need to measure but Also I was waiting for the front end to settle. It doesn't have 20 miles on it since I did the front end.

[SCOTI]

Originally Posted by DNGR

Thank you, So a larger wheel may help as I go lower.

Yes (when using lowering blocks =/>2").

If a 15" tire goes flat but stays on the wheel w/1.5" blocks, it will still roll depending on the thread extended after the nut under the arm that secures the axle tube. It will also likely make some contact & damage the threads @ the end.

Beyond that 1.5", those U-bolt ends are making contact. Larger diameter wheels simply increase the scrub-line dimension allowing use of taller blocks w/o issue.