1997 Mercury Sable HAVE TROUBLE SHIFTING

PCM depend on the readings from the speedometer to correctly shift if no speedometer reading it will default to limp mode and very hard shifting if any checking for codes should indicate to a troubled speed sensor speed sensor is located at the tail end of the tranny passenger side by the axle output shaft FLUID LEVEL CHECK Before vehicle is driven, ensure fluid is above DO NOT DRIVE hole on dipstick. Drive vehicle about 20 miles, until transmission is at normal operating temperature. Vehicle must be at normal operating temperature to ensure correct fluid level check. Fluid level should be checked with vehicle on level surface. Start engine and shift transaxle into each gear position, ensuring each gear engages. Check fluid level in Park position with engine at idle. Fluid level should be within cross-hatched area of dipstick. Ensure the following: Use only Mercon transmission fluid. If transmission fluid is excessively hot, allow vehicle to cool for 30 minutes prior to checking fluid level. Excessive heat build-up due to high speed operation, trailer towing, or operation in hot weather will effect fluid level. DO NOT overfill transmission. Fluid will foam and may cause transmission malfunction. Excessive fluid must be removed. Add fluid in 1/2 pint (.25 L) increments.