Drop spindles 67-72/73-87

[Tony71c10]

Im in the market to buy 2.5 drop spindles for my 71 front disc brake c10. Was reading that I can purchase the 73-87 (CP4S4) spindles and just change the upper/or Lower ballpoint. I also replacing my 1.25 rotors. I guess my question is what is the benefit of using the 73-87 spindle. I'm already plan on taking everything apart so if beneficial might as well do the spindle upgrade. Any recommendations ot info is already well appreciated. Thanks in advance.

[p0508]

http://67-72chevytrucks.com/vboard/s...d.php?t=438758


lolife99
"Same control arms from 67-72.
Those spindles are 73-87 spindles.
They are cheaper because the balljoints and tie rods are cheaper.

All drop spindles (with the exception of CPP's modular spindles) are designed after the 73-87 spindle.
The tie rod holes and balljoint holes are just reamed different sizes.
This is why they can make a different spindle for all the years.
60-62, 63-70, 71-72, and 73-87."

[Tony71c10]

Is going with a larger upper ball joint a good thing. Looks like I would also need to change the tire rods and sleeves to upgrade to 73-87 spindle

[lolife99]

Originally Posted by Tony71c10

Is going with a larger upper ball joint a good thing. Looks like I would also need to change the tire rods and sleeves to upgrade to 73-87 spindle

71-72 trucks make the swap to 73-87 spindles easier than the 67-70 trucks.
Change your upper ball joint and outer tie rod only. Lower ball joints are the same.
I see zero benefit in using 73-87 drop spindles over 71-72 drop spindles.
Same casting.
Just different tapers on the holes.

[Tony71c10]

Appreciate the info