Prioritizing repairs and looking for knowledge

usualsuspect

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Dec 23, 2025
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Location
Helena mt
I have owned a 1998 mark lsc for five years. It has 136000 miles on it. Over the course of the five years i have replaced/repaired:
Pass side mirror, plugs & coils (motorcraft), tensioner pulley, and the ballast on the trunk light. I zip tied the blend door actuator three years ago and have not had any issues lol. Used tail lights. New windshield. New fuel filter. New tires.

I cut the mufflers off and str8 piped it to the tips. I live in montana and we dont beleive in emissions. It made a huge difference. I have plans to get rid of the catylitic converter too.

Im open to opinions and advice on anything. I consider myself mechanically able, but by no means am i a mechanic.

I purchased workshop manuals 1&2. I love these cars and have since i was young. No plans on selling it. I take care of what i have until it financially makes no more sense. Which this car has paid for itself quick. Got it for 800$
I drive it moderate - rarely. Partially because i dont want something to happen until ive completely addressed issues.

As i have found out parts are not there. I am in the process of buying a parts car to battle that.

Need a new front seat. Sunroof needs adjusting.

While doing the plugs i noticed a little oil on the plug. Cleaned out the cavity and and drove for a day and there was a little in there. How crucial is it to adress this?

One day i noticed i was low on tranny fluid. And there was a puddle in the garage. Filled with a little lucas stop leak and a quart of fluid. Has held since. When i bought the car i noticed a slight slip. After that low level incident and refilling it it has been ok.
Should i drop the pan and do the filter change? Or just the fluid? Multiple opinions exist on this. I know i have 3 suburbans in my lifetime. 2 of them i junked because i did the filter and fluid and the tranny died a few months down the road. The other one it slipped the fix and is still strong.
The previous owner said the mark never had the tranny serviced filter wise but wasnt sure. My old man said to change the fluid. Leave the filter. Im sure the manual will say to change the filter.
I would appreciate opinions. I am trying to avoid a potential detrimental mistake.
Transmission rebuilds are not in my league.

Last weekend i lost oil. Looks like its the oil filter adapter gasket. I tightened a bolt juuuuust slightly and it stopped.sunday i started and drove it and it started again.
I also have had the battery light flicker on and off accompanied with some odd electrical issues in this car-owner love affair. I should probably replace the ground cable when i adress this because its near all the oil build up. Just my guessing. Ill post some pics of what i have in my phone . Thanks everyone and i look forward to your knowledge making me smarter!

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