speedo driven gear keeps getting chewed up

[7-UP BILL]

The 23 tooth driven gear for the 90 and up AOD's and T-5's are needed for 3.73 gears. The trans that year came with an 8 tooth drive gear. If you have a T-5, just go to a trans shop and have them remove the tailshaft and replace the 8 tooth with the 89 and older 7 tooth drive gear. With 3.73's I believe your driven gear goes to a 19 tooth,(red). Look at a 19 tooth gear vs. a 23 tooth gear and see how much thicker the gears are on the 19 are vs. the 23. There's your problem. The teeth are too thin on the 23 to last any length of time. AOD people are going to have it tougher as the whole trans must be disassembled to remove the tailshaft housing and install a 89 or older tailshaft housing. The drive gear is machined into the AOD housing making changing the housing the only alternative.