You should be fine with that mileage. Delete the check valve in the cooler line will be the best thing you can do to extend trans life. Also keep an eye on fluid level and keep the fluid in good condition( fluid and filter changes). If you want to go further yet, a trans temp gauge can help watch temps. That's what kills these autos. You can also install a shift kit and that'll help shifting and replace any broken parts in the valvebody. If you want to buy a new trans, get a PATC Viper and you'll never need another automatic again. They're the best built 46re's a guy can buy. Be around $3k tho
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