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Originally Posted by richtazz
GM factory tachs are notoriously innaccurate. Unless you hear valve clatter or know what 7200 RPM's feels like and know that's what it's turning, I wouldn't worry. You could hook up an aftermarket tach and see if the two jive. The window motor is a standard GM riveted in unit. Remove the door panel, drill out the rivets, pull off the motor and replace. The new motor may come with bolts or new rivets. IF the car was abused at all (most WS-6's are), the rear end is probably shot. GM used some real brains putting their corporate 7.625" rear end behind such a powerful motor. Rear end differential problems are VERY common in 4th gen W-bodies. I've never done an intake on one of these cars, but since the motor disappears under the firewall, it can't be fun.
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the tach definetly seems prety accurate. i know 7200 rpms is quite a bit. but the motor sounded like it was pushing like crazy when it shifted(going like 25mph or more. my car spun the tires like crazy. so i now its not slipping. ive heard some bad things about the rear ends in that car. im planning on putting new gear in it anyways. i think the window motor has been replaced once already becae the window motor itself its not rivited to the regulator its bolted. so im thinking its been done once before. thanks for replying