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Vacuum pump/ transmission problems

Old 02-14-2014, 12:00 AM
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Vacuum pump/ transmission problems

Does the vacuum pump effect the shifting capabilities of the transmission? I have a 1996 12v 2500 4wd and recently it started not shifting into 3rd gear. It just dawned on me that at about the same time I developed a vacuum pump leak that caused braking problems. i was wondering if the transmission uses vacuum to shift??
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Old 02-14-2014, 09:05 AM
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Old 02-16-2014, 08:50 PM
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That was a GM thing.....never mopar. Depending on what tranny you have....47RH or 47RE.....your tranny is shifted either by "H"ydraulic input, or "E"lectronic control.
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Old 05-01-2014, 03:01 PM
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Shifting issues are commonly due to wear in the TPS (Throttle Position Sensor). There are a large amount of posts here on that with some quick checks and fixes as well as suggested to just replace it. A quick search will have you busy.

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