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.So my 1078 has 17500 ish miles on it, it is 1994 so I'm a little leary of swapping out fluid when the transmission has had oil in it for 30 years / I know it's better for it but I get scared it will screw the transmission up . Thoughts on people doing this with these older trucks
Me personally, I would leave it like it is. If you are due for a transmission filter change - go for it. Otherwise I would leave it alone. My M1088 and my M1089 run a few thousand miles a year. They both crank up and shift fairly well (smoothly). The M1089 shifts a little "harder" but it weighs in at about 40,000# too, so I am perfectly happy with mine the way they are.