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mcgruder73, ASE Certified Technician
Category: GM
Satisfied Customers: 3490
Experience:  ASE master certified, GM certified, GM Mark of Excellence.
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94 GMC Sierra 1500: replacing the rear end..ratio codes for a 10 bolt

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I am replacing the rear end on a 94 GMC Sierra 1500 4x4. I need to know the ratio codes for a 10 bolt. I was told they were GU4, GU5, or GU6 but none of these match what I could find. I only see K28 or G22. Could you help me figure this out.
If you give me your VIN I can try and decipher that for you ok.
Customer: replied 7 years ago.
Ok, here is what I can find in the parts catalog...GT4, JB5, JD5, MG5, M30, F44, and G80. Also XPS for 3:73 ratio with 8.50 ring gear. Let me know if you need more info as I have what each RPO code means.
mcgruder73 and 3 other GM Specialists are ready to help you
Customer: replied 7 years ago.
If I could get rpo codes that would be great. Thanks so much for your help.
Customer: replied 7 years ago.
If you could send rpo codes that would be very helpful. Thanks again. Payment and feedback left. Appreciate your time and help.
GT4-8.50/8.625 ring gear, JB5-vacuum power brakes, JD5-hydraulic power disc/drum brake, MG5-Getrag 5 speed manual transmission, MT1-4 speed automatic transmission, F44-except heavy duty chassis, G80-positraction/limited slip rear axle.