Question about 1983 Ford F150

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Have to manually shift auto transmission up , but shifts itself lower automatically ??

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Could be vacume assist module in the back of the transmission right above the pan there is a brass colored bell shaped part with a vacume line attached check the vacume hose it could be disconected or hose has a hole in it try that if that doesnt work get a new assist module they are fairly cheap and easy to replace you will loose tranny fluid when you take it out so put a clean drip pan under it so you can put it back in the tranny how you put in new fluid you may ask thru the dipstick housing use a funnel. usually the vacume hose gets disconnected or gets old and breaks so this could solve your shifting problems..

Posted on Oct 31, 2010

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Shift Controls, Automatic Transmission The transmission shift control linkage or cable transfers the transmission operating mode from the selector lever to the transmission. The indicated transmission position on the steering column is transferred to a shift lever on the bottom of the steering column. On vehicles equipped with cable-operated shift systems, the indicated position of the transmission selector lever is transferred to the transmission through the shift cane, then to the cable, and down to the transmission manual shift lever at the transmission. On vehicles equipped with shift rod assemblies, the rod transfers the indicated transmission selector level position through a bell crank assembly to a control rod. The control rod transfers the indicated position to the transmission assembly.
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  1. On F-Super Duty Chassis Cab and Motorhome and Commercial Chassis recheck for correct operation of the automatic transmission selector indicator (PRN(D)21). Refer to Section 11-04A, Steering Column, Shift Rod Within Tube. ani_caut.gif CAUTION: Under no circumstances will it be permissible to adjust linkage in any position other than the(D) position for E4OD applications.
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