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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
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