[Half-Inch Stud]

Originally Posted by Schurkey

My understanding--and I have not confirmed this--is that the lower the alphabetic descriptor on the tag, the more "bread-and-butter" the transmission calibration is.

So, for Pontiac, the alphabetic descriptor starts with "P". Then we have the variations: PA, PB, PC...and so on. A "PA" would be REALLY common, the performance/specialized versions--more torque capacity, higher shift points, anything else "specialized", would be higher-up the alphabet.

Naw. PA, PB, PC are PMD Long-Tails, PC being the most stout.

PD-PZ would be shorttails. PD, PQ, PZ being less stout than the PC.