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Message: <blockquote data-quote="Bigdaddy" data-source="post: 464926" data-attributes="member: 10421"><p>I replaced my tranny with one from another 94 gt (auto). When I test drove it my mph were (and still are) off by 9. If my speedo says 79 my car is going 70....the other day I was driving on the highway cruise set at 80 on the speedo and my car shifted in and out of OD a couple times. Here is what I'm thinking. The car I got the tranny from had different rear end gears and it is fooling with my computer. If that sounds good let me know. I figured I would just take the speedo gear off my old tranny and put it in the new one and that should fix the off mph and the shifting in and out of OD.....and while we are on the topic of trannys and gears, I have a set of 373's to put in my car (bought before I knew what was in the car) but my car has 320 something (I think)(drive shaft spins 3 and 1/4 times to one revolution of the tires. My question is....will there be that much of a difference between what I have and the 373's,,,,I don't want to spend a couple hundred bucks and not see much of a difference. Thanks in advance.</p></blockquote><p></p>