Transmission Fluid Change

Hope everyone had a great 4th of July...now we get into the meat of the summer! I want to change my transmission fluid. It is a new to me boat and I have put 50 hours on it over the past 2 years and I have not changed it. 1999 SN 285 hp carbureted , 1:23 to 1 transmission. What is the best way to do this? I have seen people say don’t change it, only change half, change it cold not hot...

I would appreciate a little step by step guidance!

Thanks!

Otto

Otto

Read the link below and if you get anything stuck in the transmission, just hang your head in shame since you were forewarned

Quite a few people have gotten plastic tubing stuck while doing this job, you don't want to add yourself to the list


link

I used my pneumatic brake bleeder from Harbor Freight, I just popped of the end that goes on the bleeder and put the hose in the transmission, hooked up the air and pulled the trigger. It was all contained in the bottle, no mess.

I believe it has been mentioned before but removing the fluid line off the cooler and then connecting a vacuum extractor up to it will get almost all of the fluid out. The line you what to use is the one that connects to the bottom of the trans. No stuck tubes down the dip stick hole!!

I had an old car fuel pump laying around that made the job very easy... if you don't have one, you could probably get one on ebay for $10. just hook it up to a spare battery/jumper box. I felt by not monkeying with a hand pump I was less likely to get the tube stuck in there... seemed to work pretty well. With the pump and everything set up... you can use both hands to guide and direct the tube into the trans like a surgeon.

I did it twice in 8 years... both times I pulled 2qts out. I will say, simply looking at the color of the old fluid compared to the new... hardly even noticeable. I too have heard it isn't necessary. I am up on my 4 year interval and wondering if I should even waste my time...