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Old 07-03-2015, 02:07 PM   #1
81GMCSierra1500
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Join Date: Jan 2014
Location: Courtenay, British Columbia
Posts: 107
Unfortunate News

The hip surgery on my 1981 GMC Sierra Classic is complete... Was assured by the shop that the gear ratios were identical, the diff is basically mint, whih is good, but I now cannot drive about 90ish km/h (55mp/h) without running over 3500rpm. I used to be able to cruise the highways easily at 110km/h (70mp/h)... Just dropped $800 into a truck that I cannot use... My only option as of now is to try to find an O/D trans (700R4), or sell it, as I will not be able to practically drive the vehicle long distances as it used to... Anybody have any ideas? I'm somewhat desperate, and very disappointed... By the way, the gears in the new differential are 3.08, so I either had 2.56/2.73 in the old 12 bolt that came out. (I still don't know what happened inside that diff)... Let me know your thoughts! I really would rather not sell it, but if I have to, I have to... :'(
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1981 Sierra Classic 1500, 305 4BBL, Ltd. Slip Rear End
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