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What is this rear end code for 1975

stano

1/2 ton status
Joined
Jan 24, 2005
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Location
Iowa
What is this rear end code for 1975? Is there a page for rear end codes?

RFHG 3422

The casting number is # 3977323
The casting date is I 6 4
It rolls over as a 3.73

But I have not opened it up to see if it is a open or locking. I thought the code would tell me?

thank you
stano
87 K5
 
My decoder ring ( which is not always correct ) said it's a 3.73,8.5in.ring gear, 10 in. brakes non locking from a 90 to 91 K series 1/2 ton.
 
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