i would agree that the older the trans, over 100k, if the fluid has not been changed before, dont. ive heard horror stories of people changing fluids and boom. no more trans. but if you do decide to do it, take it to aamco. $99 for a lifetime of trans flushes.
or you could just go manual and never have to worry about it 
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1986 IROC-Z - 305- .030 over, Voodoo cam, 113 vette heads, tpi, hedman torque steps, GMMG 3in catback, custom chip, t56, 3.27s 9 bolt, rest of the car is stock.
2011 Camaro - 2lt/rs red jewel tincoat, m6 - SOLD
2014 Camaro SS - bolt ons
1998 Jimmy - the beater
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