Drop spindle question

Hey guys,

I bought some drop spindles for my 94 crewcab dually. They are belltech model 3600 which apparently for the 88 ext cab dually. I was told the pin is a different size. Anyone know much about the difference and whether I might be able to get them to work on my truck?

Any help would be great.

The 3600 is listed for '88 only, not sure what the difference is but there's gonna be a good reason for it. 3700 is for the rest of them.

Don't let people confuse you with the reason there are different drop spindles for the half ton early extended vs. regular cab; that's a difference in how long the stub axle is because the first couple years of regular cab half tons had small brakes.

Richard