puttin in converter
If the change interval is kept up (I change it every 15 to 20k) you should have no issues.
Its only high mileage trannys that don't have the fluid changed that it could be an issue.
You are oging to have to drop the transmission so you'll have fluid leaking out at least the tailhousing, and you have to pour some in the tc so you don't fry it at the first start up.
I don't see any reason to not drop the pan and do a fluid change at the same time.
If your transmission is so bad that a fluid change toasts it you should probably have the transmission rebuilt anyway.
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Since I posted in here, I magically ended up with a Fuddle 3600 in my hands.
My transmission is currently under the car, without any fluid, and waiting on me to throw the verter and filter in and fill her up.
Should be back on the street this evening.
Still a fan of doing a fluid change with the converter swap, and I plan my upgrades to coincide with fluid changes.
First converter went in at the 30k fluid change, did a shift kid, rebuild and vacuume mod, second TC is going in at the 60k change.
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