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Message: <blockquote data-quote="StratsRule07" data-source="post: 829686" data-attributes="member: 14182">This is my first post here, or any Mustang forum for that matter. Just had my rear end rebuilt with 3.73 gears, King Cobra Clutch installed, and put in an American Muscle Short Shifter. The shifter is AMAZING compared to stock, couldn't believe how well it performs after reading all the mediocre reviews. Definitely not as good as a Steeda or MGW, but easily worth the money. That is neither here nor there, but I do have a couple of questions. I assumed my mechanic was going to, in some way, recalibrate my speedo for me. Unfortunately, this wasn't the case and I now have a speedo that is WAY off. Will the Ford Racing Speedometer Calibrator on American Muscle work to recalibrate my speedo? I have done my fair share of wiring so the install wouldn't be an issue. Lastly, my seats are motorized and will not move forward or backward. I'm guessing they are just off the rails. Anyone else had this issue that could give me a ballpark figure on what repair costs would be? If it's going to be outrageous I'm not against leaving the seat as is!This '94 GT has been my first real adventure into car scene and it has been great thus far. I've been riding offroad and on two wheels for several years, but with bike insurance costs being so high and having 4000lb torpedos flying at me all day...you get the picture. Pretty familiar with the ins and outs of engines, and I don't think I could have picked a better platform to start with than the 5.0. My mods so far are the 3.73 rear end, King Cobra Clutch, Short Shifter, BBK Shorties, Off-road H, Flowmaster 40's, TFS Stage 1 cam/ springs, SCT Chip/Custom Tune, K&N Filter, 17" Bullitts and some sweet Mich tires. Running Royal Purple in the crankcase and rear end with GM sycnro-mesh in the tranny. Fresh plugs, cap, and wires as well. Car is clean as a whistle and has never been wrecked! High mileage, but well taken care of. For my next mods, I am either going to gear rear control arms and subframes AND/OR wheels and tires. What is the largest tire I can safely run without rubbing or being unnecessarily big? I would like to stay with 17's, but would like a deep dish in the back. I have seen 315's on the SN95's but I wasn't sure if that was overkill or not. Following the suspension work and wheels and tires, I will either be going with the TrickFlow top end from summit or picking up a used S-trim this summer locally. Any input would be well appreciated!</blockquote>