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Transmition vacum
#1
I have a 1998 31ft open with 454XLI engines went to check trans fluid  before launch and had a vacuum on the dipstick I don't know if there is a check valve on the vent or not anyone else notice this with there boat?
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#2
That is normal, my ZF 220a transmission does the same as well as other I have worked on or seen. 
Tom
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#3
Thanks for the info trit21 I guess I can relax
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