The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 99 Suburban--Axle ratio?

95 S_Trucker · 09-25-2018, 07:39 PM

The most popular RPO codes for differentials:

GU6, 3.42
GT4, 3.73
GT5, 4.10

If you can’t find any of those codes, post back and tell us all of the codes that start with G.

09-25-2018, 07:39 PM	#4
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,179	Re: 99 Suburban--Axle ratio? The most popular RPO codes for differentials: GU6, 3.42 GT4, 3.73 GT5, 4.10 If you can’t find any of those codes, post back and tell us all of the codes that start with G.