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1985GMC · 10-28-2014, 11:58 AM

1985 GMC K2500 4WD, VIN M
3L80 TH400 automatic

Dextron II is what ALLDATA says to use for fluid. Anyone have success with other type of transmission fluids? I've had success with Lucas Oil products and was debating using their Trans. Fluid.

Suggestions??

Thanks.

10-28-2014, 11:58 AM	#1
1985GMC Registered User Join Date: Nov 2012 Location: Morris, ct Posts: 54	TH400 Fluid of choice? 1985 GMC K2500 4WD, VIN M 3L80 TH400 automatic Dextron II is what ALLDATA says to use for fluid. Anyone have success with other type of transmission fluids? I've had success with Lucas Oil products and was debating using their Trans. Fluid. Suggestions?? Thanks.