Tranny fluid - flush or just new fluid & filter? [Archive] - Forum


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11-06-2006, 08:23 PM
I searched and did not get a clear answer. On my 02 GA GT, I got the tranny flushed at about 60k miles. It's at 100k miles right now. Do you guys recommend another flush or just a new fluid and fliter this time?

I always hear mixed opinions like:
- Flushing may cause slippage.
- New fluid is better for the tranny life.
- It won't benifit unless you got new fluid every 30k miles since the car rolled out of the assembly plant.

Any ideas?

11-06-2006, 08:30 PM
Unfortunately this is a classic example of "he said she said". There is no definitive answer on whether or not flushing causes problems or if its a matter of the trans going out beforehand.

Since you had it flushed once I see no harm in doing it again, but its really just a matter of what you want to do.

11-06-2006, 08:32 PM
if your doing it yourself and have time do a flush, if no time drop pan change filter! If your paying to have it done then it all depends on how much you want to spend right now.

11-06-2006, 08:38 PM
GM recomends a flush every 50,000

Mike Jung
11-06-2006, 10:08 PM
GM recomends a flush every 50,000
Since when ?

Please provide proof.

The manual (& so does GM Canada) says ATF service every 50K.
Meaning a pan drop & re-fill with gasket & filter change; not a "flush".

Services due at 83,000km (50K miles).
Automatic Transmission/Transaxle Service (severe conditions only)
(Necessary only for vehicles which are often driven in heavy traffic during hot weather, or on hilly/mountainous terrain, or vehicles which frequently tow a trailer.)
Goodwrench Service Technicians inspect your vehicle's transmission/transaxle for leaks. We replace the transmission/transaxle fluid, gasket and filter, and adjust the linkage (if necessary). We also road test your vehicle both before and after service.

Like engine oil, transmission/transaxle fluid and filters become contaminated with use and require regular replacement to prevent wear and damage to moving metal parts. This reduces the possibility of breakdowns and expensive repairs.

08-19-2007, 01:04 PM
ive been asking,no ones been answering.still unclear of how to drain the fluid and put in a new filter,and how many quarts to put in....

08-20-2007, 11:38 AM
ummm well thanks?

08-20-2007, 02:42 PM
ive been asking,no ones been answering.still unclear of how to drain the fluid and put in a new filter,and how many quarts to put in....

search for it. i remember it being posted not overly long ago.
this looks fairly good: post #6.

08-20-2007, 10:42 PM
Yep, that thread has all the info you need. The post by timka86 was pretty much spot on. The only thing I'd add is that after doing a drain and fill I like to shift the tranny thru all the gears a few times and let the wheels turn a bit after I refill it and I'm checking the fluid level... just to make sure everything in the trans has fluid sucked into it and I'm getting a true level.

08-21-2007, 02:02 PM
K well i finally got it done today. New filter and Royal Purple ATF. Shifting is much smoother,although when you punch it,around 5 grand is slips. Pressure need to build?

08-21-2007, 04:09 PM
k went for a ride again. seems 2nd gear is surges rather that slips,after 4grand it surges in like 500rpm intervals? its weird,idk what to do. Checked into the little tap to see if there was enough fluid,some poured there was hoping its the pressure?

08-21-2007, 07:20 PM

08-21-2007, 07:40 PM
Did you use syn fluid??

08-21-2007, 07:43 PM
yea,royal purple atf

08-21-2007, 07:51 PM
That could be it. Ive heard of some stories where people switch from GM fluid to any type of syn fluid and the tranny just doesnt like it.

08-21-2007, 08:03 PM
i mean it shifts great. Its just that 2nd gear area it does that surge

08-21-2007, 08:08 PM
That surging is probably the clutches slipping and grabbing because of the synthetic fluid. Probably should have stuck with regular fluid, but upping the line pressure for shifts might help a bit if you can program it.

08-21-2007, 08:33 PM
well i have the DHP thinking that since i drained it,it has to relearn the pressure again,so some driving around im think may help, no? But metalman used royal purple and he has no complaints....

08-21-2007, 09:00 PM
That really doesnt make any sense at all. It should keep it stored regardless of fluid.

08-21-2007, 09:19 PM
Idk,i just dont get how other people have used it with not problems,and then i put it in,and i get the surge

08-21-2007, 09:38 PM
How many miles do you have on the car?

08-21-2007, 09:43 PM
93,000. It was the first fluid change

08-21-2007, 09:49 PM

That is why its acting up I bet. Considering it went from super super thick fluid to really slick and clean fluid. Id go get some regular fluid and try that.

08-21-2007, 09:54 PM
ehhh the fluid that came out was blackish,old old and gonan run it for a while. I mean the difference is amazing. And it does the surging in the same RPM area and gear all the time.

08-21-2007, 09:57 PM
and im sure it needs to get use to the new stuff....

08-22-2007, 02:26 PM
Update...woke up today,moved the car,it leaked fluid over night. Found the leak,fixed it,came from the temp sender i have from my gauge,forgot to put sealant on it when i put it back iin. Now took it back out today,and there was a **** ton of fluid came out. Well went for a ride after everything was right. And yea gunned it the first couple times and it ran great,not surges or anything. then a little later i did, and it does it in 2nd gear after4grand. No when i drive the car normal,smooth shifts and everything,none of that in second gear,just hard driving. No i looked at my old tranny fluid,its solid black,looks like old motor oil. Like ive been saying im hoping its just getting use to the fluid.reassurance anyone???

10-03-2007, 08:49 PM
give us an update

05-08-2008, 10:35 PM
ah and im thinking about doing this next week....its like i should almost leave (what i believe to be tranny fluid with 95k on it) in it.......

05-16-2008, 10:32 PM
wow, i dont think mine has ever been done and ive got 95 or 96k on mine :( Ive got 13 qts (checkers said it could take up to 13 to fill) and 1qt of lucas for it. Ill probably do it monday or tuesday. Ill post up how it goes. Have any of you noticed any help in MPGs after it? Mine are ****ty!!

05-17-2008, 09:28 AM
I believe there is guy on bobistheoilguy that has come up with a excel spreadsheet that tells you how many times you need to drop the pan and fill the tranny with fluid to get a COMPLETE tranny fluid change. I think the grand am its 9 times! thats to get all the old old stuff out. I have done this 4 times so far and filled with Dex 6.