GM 14-bolt FF Rear End with 149k miles
Hi to all, Our TV is a GMT400 1997 GMC K2500 7.4L Burb with 149k miles. It is 8-lug, 3.73, GVWR 8,600, with GAWR RR of 6,000 lbs for the full floater rear axle. We believe the rear end also has 149...
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I have the GM service manuals (2-volume set) for this exact model. The G80 is listed as follows:
Page 0A-24:
"G80 Axle, Rear: Limited Slip Differential"
Pages 0C-8 & 3E-13
"To distinguish between a standard rear axle and a limited slip rear axle, check for Positraction (G80) on the Service Parts Identification label"
And that's all in Volumes I & II.
So, no help from the service manuals. Evidently that info in the service manual has been boiler plated from years and models gone by.
Edit: And here is the info for the Owner's Manual for this exact model, in the section "Recommended Fluids and Lubricants":
"Differential Front and Rear Axle - Axle Lubricant (GM Part No. 1052271) or SAE 80W-90 GL-5 Gear Lubricant"
So much for the owner's manual.
On page 2-20 is found "Locking Rear Axle (If Equipped)" which talks about this feature giving extra traction, but nothing about specifying how it works or any special fluids.
No wonder the confusion.
Page 0A-24:
"G80 Axle, Rear: Limited Slip Differential"
Pages 0C-8 & 3E-13
"To distinguish between a standard rear axle and a limited slip rear axle, check for Positraction (G80) on the Service Parts Identification label"
And that's all in Volumes I & II.
So, no help from the service manuals. Evidently that info in the service manual has been boiler plated from years and models gone by.
Edit: And here is the info for the Owner's Manual for this exact model, in the section "Recommended Fluids and Lubricants":
"Differential Front and Rear Axle - Axle Lubricant (GM Part No. 1052271) or SAE 80W-90 GL-5 Gear Lubricant"
So much for the owner's manual.
On page 2-20 is found "Locking Rear Axle (If Equipped)" which talks about this feature giving extra traction, but nothing about specifying how it works or any special fluids.
No wonder the confusion.
