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90 ford: automatic..overdrive..shift if I get up to 2200 rpm..pedal…

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My 90 ford 250 4X4...
My 90 ford 250 4X4 automatic w/overdrive suddenly stopped shifting from 1st gear. It will shift if I get up to 2200 rpm and then suddenly back off the pedal. Could it be a vacum problem???

Optional Information: 1990 Ford f250 4x4 7.3 diesel
Already Tried:
nothing yet... Read full answer
My 90 ford 250 4X4 automatic w/overdrive suddenly stopped shifting from 1st gear. It will shift if I get up to 2200 rpm and then suddenly back off the pedal. Could it be a vacum problem???

Optional Information: 1990 Ford f250 4x4 7.3 diesel
Already Tried:
nothing yet
Submitted: 13 years ago.Category: Car
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Answered in 1 minute by:
11/1/2005
Auto Mechanic: Tony Pummill, 10 yrs exp in auto repair replied 13 years ago
Tony Pummill
Tony Pummill, 10 yrs exp in auto repair
Category: Car
Satisfied Customers: 41
Experience: All hands on experience.
Verified
Could be but first check your transmission fluid, if its black or smells burnt change it immediately.
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