George, thats incorrect. I bought a P30 with the I beam type, with the big 5 lug axle...so P30's do come in both 5/10 lug or 8 lug.

Trying to understand the differences on the spindle/hub between IFS and I-beam...
If I had to guess the disc brake P30 swap only works if you find the I-beam type since it uses kingpins.
That makes sense anyway...
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Last edited by campbell45; 08/07/2023 1:20 PM.
1971 Chevy K10
1968 Chevy C50
1966 GMC 4000 Tilt Cab