It looks like the 4 numbers are not date codes, but production sequence at the Hydramatic plants. My PQ TH400 trans is the original numbers to the car with original '5-5' furnace brazed torque convertor, vacuum modulator, and the turquoise "PQ" paint stamp on the bellhousing.
The following is a quote from Mike Ransom (Held for Ransom) regarding PQ tag colors...they aren't gospel, so Yellow probably was a carry over color from '69 into '70 at the plant.
"I've found most years are color specific. I don't know when or why they changed to a pink tag in '70, as most are a black background."
Checked my notes and you guys are right...
'69 PQ Yellow
'70 PQ Black, then Pink.
'71 PQ Blue
'72 PQ Yellow
'73 PQ Pink
'74 PQ Blue
"The serializing, I can't comment on."
I hope this helps...
Dennis
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