Help ID front axle

[steampunk c1]

Hi first time post . I have a 1955 pickup and the front axle has been replaced with a drop axle casting number 3712013gm27 is after market or real GM part the old axle has casting number of 3712013GM25. I need to be able to ID the axle for low volume certifcation for rego here in new zealand .

[1project2many]

How do you know axle is replacement drop axle?

Part number is for real axle, stock for 1955 truck. Casting number is part number. Original cost $31.75.
http://www.gmpartswiki.com/getpage?pageid=67646
http://www.gmpartswiki.com/getpage?pageid=68232

http://www.gmpartswiki.com/getpage?pageid=23713

Option code in third listing is is F022. Listing is here:
http://www.1955gmc.com/1955-59gmcguide.html

hth

[steampunk c1]

I bought the truck with the drop axle fitted it is a replacment as I also have the orginal axle both have the same cast number but the std axle ends with 25 and the drop axle ends with 27.

[1project2many]

FYI, GM part numbers do not contain "GMXX." The part number as shown above in the GM parts books is 3712013. It is possible that someone had a factory axle reshaped for the drop. We did that with a vintage racecar years ago.

There are a couple of guys here that have worked for GM and might shed some light on the "GM27" portion of the code. I think one has a 70's truck and might be found in one of the newer model forums. I'd love to know what that indicates.

[steampunk c1]

I may have worked out my droped axle. Found a axle guy called nostagia Sids chevy axles and he takes std axle and drops them up to 4 inchs anybody used his axles. good are bad.

[1project2many]

The axle we had done is still in use under the vintage racer 20 years later. It survived a pretty good front end hit along the way.