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If you can, hook up a scan tool and check codes. A good scan tool can give you full diagnosics. No 4th generally means low pressure. A flush and filter change may help but a rebuild may be needed. If you do not have a scan tool, It is easy to install a pressure gauge and check. 1/8" pipe fitting on the driver side comes out. The gauge is just like any oil pressure gauge but needs to read 300 psi. Normal pressures can go up to 180 psi or so running in gear. Idle in park around 60. These are ballpark numbers. Different year trans have different specs.
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Keep talking, Im gonna put you in the trunk.
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