King Pin Size using NAPA #'s

[oldmopar]

Using the 2 King Pin #'s from NAPA as Merle posted in a previous thread

"Anyway, here's what I discovered. (some Napa P/N's for anyone's reference)

King Pin sets;

Napa P/N 2621231 for up to Serial # 83351873 (list price $116.06)

Napa P/N 2621378 for Serial # 8331874 and up (list price $75.73)

These serial number breaks match what's in my parts manual. (P/N 933436 up through S/N 83351873 and P/N 1321261 for S/N's after 83351873)"

My 48 1 ton falls into the 1st set at $116.06 = napa 2621231 and when I compared them to the other napa set 2621378

I see that the 2 different sets use a different diameter pin it also lists 2 different bearings one is called TS the other called TB not sure what the letters mean . Then since the pin goes through the axle and there are also 2 different parts #'s for the axle based on serial#. The difference is only 0.0077 This is if NAPA's info is correct.

No answers just trying to understand but it looks like there was a change in the pin size on the newer trucks to a slightly thicker pin.

[Merle Coggins]

I made a similar post in that other thread, but...

Some of the other, less expensive, kits that come up have thrust spacer washers (TS) instead of thrust bearings (TB). Also some have nylon bushings instead of metal ones. I have also noticed that some reference heavier axles than what is used in the smaller trucks. The only two that I found to match up correctly were the two that I posted. Also, most of the kits will reference the pin size. It may be wise to knock out your pin and compare measurements before buying, but I do believe that the numbers I posted are correct.

Merle

[oldmopar]

The explanation for the bearings was a help the TS TB bearing type had me confused. I do plan to remove the pin 1st and see what is there. I know they were using the nylon in the later 50's but by 59 there was a service bulletin to replace them with the metal bushings.

Ed