904 differences

well as long as it will cycle through to the pan I won't worry I just know I didn't do the rebuild in surgical conditions and am a little paranoid no biggie tho as with the spring mod I can feel it shift to 2 in the 25 to 30 range and into third in the 40-45 range but I can peddle it into third at about 35-37 so thats where I'm going to leave things for now , I need to get this thing out on the highway this weekend and find out if the drive shaft is good at 60 and how the car feels at those speeds . I really like the way it sits on the brake now it has a fair sized cam and is lopey but it isn't surging and pushing against the brakes at the lights like it was and the idle seems calmer and the car even seems a little quieter if only because of how smooth it drives , it's really deceiving it feels like it's a granny mobile but when I look at the speedo it say's I'm doing 40 -45 and it should be off the other way because it was bang on with a stock sized tire before it came out of the car and now I'm running those 245/60/14's which are supposed to be almost 2 inches bigger , can I swap the speedo gear from the 727 or are they model specific ?