Where did you purchase your Tremec? They should have told you that Tremecs have a different speedo drive gear. I think the Tremec's are 7 tooth instead of 6 in the T-5's. D&D set me up with a 20 tooth (black) speedo gear for my Tremec when I got mine last year - I called them to tell them they sent me the wrong gear (I had a 21 tooth in my T-5 w/3.55s before), and that's when they informed me that the Tremecs have a different drive gear.
Good to hear you got it figured out.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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