i just recently purchased a 1984 300SD..has 200000 miles on it....but transmission was rebuilt at 130000 miles..when in high gear and you floor it ..engine reves up slightly....transmission seems like it is slipping....checked vaccume at transmission modulator and while in park it is registering 10 to 12 lbs of vaccume...any kind of adjustments i can make or is this sucker fixing to require a rebuild....thanks in advance

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1984 sd cream puff