93 bonniville shifting problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-03-2011, 11:57 AM   #1
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Question 93 bonniville shifting problems

when the car been setting for a long time,such as overnight the trans will not shift into any gear.the shifter moves freely and engine rpm drops as if the converter engages but the car will not move until the car runs for a couple of minutes.yet there is no sign of slippage or burnt fluid. thanks
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Old 09-06-2011, 04:28 PM   #2
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How old is the fluid and filter? Have the oil pressure in the transmission tested.
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Old 09-06-2011, 10:45 PM   #3
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Default 93 bonnie

the past owner had the fluid and filter changed prior to the sale.I know better than to trust someone I do not know.Once I change them and if there is no difference is a pressure test as simple as an inline gauge to the fluid cooler? Or is it time for transmission swap?
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Old 09-06-2011, 11:04 PM   #4
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There should be a oil test point on top of the transmission near the shift linkage.
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Old 09-07-2011, 08:01 AM   #5
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Typically this is a bad seal or input piston.
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Old 09-07-2011, 06:38 PM   #6
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Talking 93 bonnie

thanks for the info will test pressure and check out the input the input piston.
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Old 09-07-2011, 06:42 PM   #7
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Default 93 bonnie

oops,my to bad my replies are not correct
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Old 09-07-2011, 10:45 PM   #8
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Typically this is a bad seal or input piston.
I agree.
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Old 09-08-2011, 09:41 AM   #9
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Old 09-09-2011, 02:01 PM   #10
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Default 93 bonnie

the fluid pressure is 70psi after setting overnight,is this correct?if it is where is the input piston located?can it be checked/removed with the transmission in the car or is it.or does the transmission have to be removed?
thanks again
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