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Pampas56 · 04-03-2018, 09:06 PM

After a quick google search I found this:

YET is 225/75/15 rear tires
ZET is 225/75/15 spare tire
1SA is Option package 01 what that entails is anybody's guess.

6WK and 7WK are Computer selected Suspension LH and RH respectively. I would guess that the factory groups the suspension parts by size or rate and tries to match the components (kinda like piston weights for high performance engines).

Keith Seymour should have the definitive answer over on the square body forum.

04-03-2018, 09:06 PM	#8
Pampas56 Registered User Join Date: Jul 2012 Location: Concrete, wa Posts: 59	Re: Help with some RPO codes please... After a quick google search I found this: YET is 225/75/15 rear tires ZET is 225/75/15 spare tire 1SA is Option package 01 what that entails is anybody's guess. 6WK and 7WK are Computer selected Suspension LH and RH respectively. I would guess that the factory groups the suspension parts by size or rate and tries to match the components (kinda like piston weights for high performance engines). Keith Seymour should have the definitive answer over on the square body forum. __________________ 1989 Silverado K2500ECLB- 307K miles with 90 K TBI 350-Not a show truck, a work tool that I can drive! 1998 Dakota EC 250K miles- I guess I'm just a truck guy now!