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Are you saying that the motor dosen't have the power to pull the truck in OD, or the tranny won't go into OD?
It won't hurt the tranny to stay in 3rd all the time as stated above.....but if it won't go into 4th or slips in 4th....you have some tranny issues.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
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