'66 Mystery cab

[JaggedEdge]

So I bought a what was supposed to be a 66 cab for a project. The guy I bought it from got it from someone else. Seems this cab has been floating around with no home for a while.
I am trying to figure out what it came on originally. Door jamb plate is intact and reads:
C3636J103906
Before you ask, there is NO mistake in reading this. Not an 8 instead of a 3, ect. The plate is not beat up or scratched, never been painted over.
I cannot find any decoder online that will read this. Most say its not a valid number.
Searching around I have come to believe this may have come off a larger truck like a 2 1/2 ton. The trans cover is the high hump, but has no extra holes. (could have been swapped) The cab also has no trace of clearance lights ever having been on top.
Anyone want to take a shot???

edit to add: doesn't really matter, I am using it anyway. Came with no title, but the cab I am removing has the original plate that matches the frame#. Yeah I know... don't say it! LOL

[Dillon Rock]

Gotta picture?

[JaggedEdge]

Won't see it again till tomorrow am, but can post up pics of the cab and vin plate then.

[yelmer]

look to be a chassis cab from the number (ca-60") one ton truck the j is for Janesville wi where it was built it was the 3906 truck off the line built in sept 65 is a 66 truck 363 stands for one ton chassis cab the last 6 is the year 1966

[JaggedEdge]

Originally Posted by yelmer

look to be a chassis cab from the number (ca-60") one ton truck the j is for Janesville wi where it was built it was the 3906 truck off the line built in sept 65 is a 66 truck 363 stands for one ton chassis cab the last 6 is the year 1966

Thanks yelmer!!! I can't seem to find that info on any of the standard vin decoder sites. I thought the number was odd, and might not be a half ton truck cab.

[rideblue00]

maybe a C30 cab judging by the high hump? proly had a sm420 trans? did the big trucks need high humps at all?