when i first got my gtp i took it to a tranny shop and had them flush and fill it. twas there when i knew i was doing a rebuild it came out almost black and when it goes from red to brown to black that means somethings cooking in the transmission and your transmission isnt going to last much longer so you can either rebuild or replace it cost me 1300 for a rebuild. might be cheaper to go scout out a wrecking yard and grab a used one and do a rebuild on it yourself then replace your old one and if your feeling confident rebuild that one and sell it
