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Re: dually axle codes (not glove box RPO codes)
My 85 has 3.73 gears and it is confirmed with the RPO lable in the glove box. Along with the DRW option.
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1978 GMC Jimmy, 400, th350, np203 with part time conversion, Fibrecraft popup camper, soon to get a 14 bolt/d44 swap
2001 Yukon XL2500, 6.0, 4L85E, 4x4, family truckster
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