I've had to disconnect my batteries twice- once when installing the Optimas and once when having my grille guard welded. Both times I lost the reading on the trip odometer but the the other odometer (total mileage) reading remained intact.
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Bill Lins Wharton, TX 98 2500 QC SLT,12 (the CORRECT # of)valves,NV4500,3. 54 LSD,Manik grille guard,Psychotty Air,Amsoil everywhere, Reading aluminum utility body and bumper,Optima yellow tops- silencer ring, cat,& muffler all stolen.