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95 S_Trucker · 09-25-2018, 03:04 PM

GT4 is the RPO code for 3.73.

It should be on the sticker in the glovebox.

09-25-2018, 03:04 PM	#2
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	Re: 99 Suburban--Axle ratio? GT4 is the RPO code for 3.73. It should be on the sticker in the glovebox.