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Old 06-09-2005, 08:16 PM
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there are two separate boost valves in the same bore in the pump of this 1991 4L60. They are about the same size , different designs though.

the PR valve goes in first , then the PR spring , then the low / reverse boost valve , then the main boost valve , then the snap ring. If these are not installed correctly the pressure will not be correct
Dont worry how old you are... it is the mileage on your body that adds up.
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