Thread: Transmission Fluid - 173K..To change or not to change, that is the question

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  1. #1 Transmission Fluid - 173K..To change or not to change, that is the question 
    SE Level Member 99XC600's Avatar
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    Ok, I've owned my 2004 GT1 since it had 8k on the odometer. It currently has 173k miles on it. The transmission fluid has never been changed nor have I ever had to add anything to it. (Yes, I know please begin the verbal abuse). I have no signs of slipping or hesitating at all. However I've never beaten on the thing either. It's my DD which I put 80 miles on every day with it being 95% highway.

    So as I was addressing the LIM gasket issue over the weekend, I started to ponder the changing of the tranny fluid. I don't know what I should do. Since it's not showing any signs of failure, should I just leave it be or go ahead and change it. I've heard story's of high mileage tranny's going south after recent fluid changes.
    2004 Ivory White Pontiac Grand Prix GT1 - Bone Stock and my 80 mile daily driver.
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  2. #2 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GT Level Member ShadowSwept's Avatar
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    Mine's at 172k and I'm pretty sure it's never been serviced. I'm about to do a pan drop and filter change and fill with new fluid. I'm pretty sure it's the flushing you want to avoid. You should be fine changing the fluid.
    2001 Bonneville SLE - L36, Cone Filter, 200k miles
    2003 Grand Prix GT
    - L36, Short Ram Intake, HV3, Emissions Delete, ZZP 3" Downpipe, Overkill Tune, 200k miles

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  3. #3 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    Turbo is the way to go. REDCRAPGP's Avatar
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    Just do a pan drop and not a flush and you'll be fine. Check for metal shavings when you do the pan drop...if you have some..plan on getting a tranny down the road if it fails.
    Squirrels are my engine. I need a Ford Regal
    04 Comp G.
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  4. #4 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GT Level Member bmx6454's Avatar
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    depending on how hot you get ur tranny. max at best conditions is every 100k.... so ur a little over that. it is a cheap simple thing to do. i would do it soon if ya care about the tranny lol
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  5. #5 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    SE Level Member 99XC600's Avatar
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    Wish I could tell you, but I have the worthless 3 button DIC in my car. So no real idea of the tranny or coolant temps.
    2004 Ivory White Pontiac Grand Prix GT1 - Bone Stock and my 80 mile daily driver.
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  6. #6 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
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    I am paraniod I change mine once a year just do a pan drop, every other year I change the filter as well 301,000 miles on trans
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  7. #7 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GTP Level Member Oxfire's Avatar
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    Pan drop, new filter, new gasket...Good to go.
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  8. #8 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
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    As a practice over the years, when my tranny pan doesn't have it, I've been adding a drain plug. I got spoiled with the 4L80E's and some older truck trans that had them so I just bought them and put one in. Before I started adding the plugs, I normally changed the filter and fluids every 75k or so. Now I run the filter for 100k and make the fluid change around 50k........besides the plug makes draining a lot cleaner and easier.......wish they did them at the factory.
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  9. #9 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GT Level Member bmx6454's Avatar
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    Quote Originally Posted by bloaty57 View Post
    As a practice over the years, when my tranny pan doesn't have it, I've been adding a drain plug. I got spoiled with the 4L80E's and some older truck trans that had them so I just bought them and put one in. Before I started adding the plugs, I normally changed the filter and fluids every 75k or so. Now I run the filter for 100k and make the fluid change around 50k........besides the plug makes draining a lot cleaner and easier.......wish they did them at the factory.
    how do you add that? welding? sounds nifty...
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  10. #10 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    SE Level Member 99XC600's Avatar
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    Sounds like I should be pretty safe.

    I think a lot of the horror stories come from transmissions that are already displaying some type of a problem and the owner changes the fluid in an effort to correct the problem. The changing of the fluid just ends up compounding the original issue.
    Last edited by 99XC600; 06-29-2012 at 07:49 AM.
    2004 Ivory White Pontiac Grand Prix GT1 - Bone Stock and my 80 mile daily driver.
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  11. #11 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
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    99X is right.........sometimes the gritty nature of the old fluid is what's keeping the thing running. I've seen exactly what he said happen.......change the fluid and the thing starts screwing up big time. Also pressure flushing is a big no-no........

    bmx.....yeah, it's fairly simple and straight forward. Buy a shallow bung kit and pick a spot in the pan that doesn't have anything above it, or in close proximity and either drill or punch a clean hole that "just allows" the bung to fit. I mig mine in, but they do make one that has an inside flange and outside threads with a thin thread on nut/collar. It comes with a thin brass O ring washer. Layer on some red locktite and snug it up....good to go. Never seen or heard of them leaking, but I prefer the weld in ones. Most guys don't bother and I can appreciate that, but knowing stock clutches like I do, I like to get some of the crap out in the interim. The quality filters are usually good for 100k or so, but having the ability to change the fluid in between stretches things a bit more.
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  12. #12 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GTP Level Member Oxfire's Avatar
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    As long as there are no metal shavings, I'm pretty sure you should be good to go
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  13. #13 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    Killa Bee Scottydoggs's Avatar
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    my brother and i just did a pan drop, filter, and then a flush to his yukon a few weeks back. he's low miles, ( around 60,000) but still the magnet was caked with clutch material. like a mound of it.

    his trans fluid was still very red, and had no burnt smell, so we did the flush and its running just fine.


    so what im saying here is when you drop the pan, the magnet in the pan will be telling a big story. thats a lot of miles for a un serviced trans.

    it may also be a good idea to to put a quart of lucas trans medic in the the trans as you re fill it. it tightens up old clutches. freshens up seals and such.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  14. #14 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
    GTX Level Member OH4CompG's Avatar
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    Pan drop it and just put a new filter and fresh fluid in it.
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  15. #15 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
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    Lube Guard is another great additive.......works wonders on sticky valves
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  16. #16 Re: Transmission Fluid - 173K..To change or not to change, that is the question 
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    I have 149k miles on mine and added a screw in bung (from Checker) at about 25k miles. It's never leaked a drop and makes changing trans fluid a million times easier. Sure, you can tig a bung in, but the screw in one I have has 125k miles on it without a single issue. I highly recommend it....
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