[IhaveadopeGT]

I changed out trans fluid yesterday to Royal Purple Syncromax. Car drives amazing, no issues with the new fluid(I had a few rough shifts going into third and sometimes first when the weather was colder). So what I couldn't get over was, when I put the old trans fluid from the drain pan into the empty Royal Purple 1 quart bottles, I ended up with 4 quarts of old trans fluid. I was pretty baffled and had to double check online from a few sources that the TR3650 only takes 3.25 quarts. I am wondering if when my car was traded in(I bought it used earlier this year). That the dealer flushed the fluid and the tech over filled my trans. How bad could this be for the trans?

[nigel]

To much fluid of any kind is worse than not having enough. That fluid has to go somewhere and it is known to cause shifting problems.

[73GRAND]

Yes, excess fluid has to go someplace. A friend of mine's FMX was overfilled and about a quart was puked out the filler tube which caused a lot of smoke (and potential for fire) when it ran down onto the hot motor and exhaust. Too much flud can cause pressure problems and potential damage but if the trans works/shifts okay after the re-fill (with proper fluid level) and no leaks with gaskets and seals then you should be fine - .75 quarts extra fluid isn't that much and shouldn't cause long term problems - bets of luck.
73GRAND

[TempletonGT]

I recently changed the fluid in my 2002 GT with the 3650 and it took approx 3.75 quarts to fill. The owners manual says the capacity is 3.8L(8.0 pints) with the note "Service refill capacity is determined by filling the transmission to the bottom of the filler hole with the vehicle on a level surface". Why the online references are in conflict with the owners manual is a mystery to me. I wonder if it is a throwback to the prior T5/T45 transmissions? If there is a valid reason to use less than the owners manual recommends I would sure like to know.

[04KenneBellGT]

Originally Posted by IhaveadopeGT

I changed out trans fluid yesterday to Royal Purple Syncromax. Car drives amazing, no issues with the new fluid(I had a few rough shifts going into third and sometimes first when the weather was colder). So what I couldn't get over was, when I put the old trans fluid from the drain pan into the empty Royal Purple 1 quart bottles, I ended up with 4 quarts of old trans fluid. I was pretty baffled and had to double check online from a few sources that the TR3650 only takes 3.25 quarts. I am wondering if when my car was traded in(I bought it used earlier this year). That the dealer flushed the fluid and the tech over filled my trans. How bad could this be for the trans?

If the tranny is working fine now and smooth shifting then i wouldnt worry about it. Just keep an eye on it for a little while. BTW, hows that RP Synchromax treating you?? I just got some and getting ready to put it in there. Did you really notice a big difference and is shifting qhen its cold a lot smoother?

[EricU281]

Originally Posted by IhaveadopeGT

I changed out trans fluid yesterday to Royal Purple Syncromax. Car drives amazing, no issues with the new fluid(I had a few rough shifts going into third and sometimes first when the weather was colder). So what I couldn't get over was, when I put the old trans fluid from the drain pan into the empty Royal Purple 1 quart bottles, I ended up with 4 quarts of old trans fluid. I was pretty baffled and had to double check online from a few sources that the TR3650 only takes 3.25 quarts. I am wondering if when my car was traded in(I bought it used earlier this year). That the dealer flushed the fluid and the tech over filled my trans. How bad could this be for the trans?

Boy I love my 4R70W but I'd save a lot of money on fluid if i had a stick lol

[IhaveadopeGT]

Originally Posted by 04KenneBellGT

If the tranny is working fine now and smooth shifting then i wouldnt worry about it. Just keep an eye on it for a little while. BTW, hows that RP Synchromax treating you?? I just got some and getting ready to put it in there. Did you really notice a big difference and is shifting qhen its cold a lot smoother?

It's by far some of the best fluid I have ever put into a tranny. My 02 Eclipse use to call for an odd ball combination. Supra also takes a wierd fluid.

To give you an idea, anytime it was around 50 degrees in the morning I would warm my car up to normal operating temps before driving due to fear of the infamous "tranny grind" in 3rd gear.

This morning it was 27 degrees, I was in a hurry and had a great opportunity to put the RP Syncromax to the test, I fired up my car, ran back inside for my lunch and laptop(literally car ran for about 2-3 minutes prior to driving). I had ZERO problems shifting in any gear. Once she reached normal operating temps I power shifted from a red light going into 2nd and 3rd. Very slight, almost non noticeable tolerance in the upshift into 3rd gear. I would very much assume my syncro's are slightly worn in 3rd with 45K on the odometer. Just regular cruising you would swear I have a different tranny compared to how rough she shifted with the other fluid I had in it.

I am definetly getting the Steeda Triax first chance I get. I have read mixed reviews it helps engage 3rd gear and I happen to like the Triax over other brands.

On that note, I was very nervous I was experiencing the infamous trans problems with the TR3650 prior to changing my fluid. I won't be using anything else other than the RP Syncomax from this point forward. Very well worth the money and time.

TempletonGT,

I have had my car 9 months and I research everything extensively prior to making a decision or performing maintenance. I have not found any other source that indicated the TR3650 takes more than 3.25 quarts.

On that note, I have also not looked at the owners manual. I have read several of my cars owners manuals and they are pretty much a "guide" to how to maintain your car. The best method I always found was "research, research, research."

I am not implying you are wrong, however, I have found many resources that show 3.25 quarts. Are you sure your transmission is not pre 01?

[TempletonGT]

"Are you sure your transmission is not pre 01?"


The transmission code on the drivers door opening identification tag on my car says it's a 3650. I bought the car at 50,000 miles and if the transmission was changed I am not aware of it. I am not familiar enough with all the types to tell them apart visually. Mine has an integral bellhousing and I think that is an identifier for a 3650. Nonetheless, I filled mine until it started coming out the fill/inspection hole with the vehicle level and that's where I got the 3.75 quart value. Glad you're happy with the Royal Purple and if you have found multiple references to 3.25 quarts then that must be good number.

[IhaveadopeGT]

It could be mine is not filled enough or the sources I found figured it works better with 3.25 quarts. I have yet to check my manual today(at work will try to remember to check it tonight when I get home).

[crzyhorse11]

the easiest way to tell if you have it filled correct is to pull the shifter fill it from the top with the fill pug undone just to where you can feel it with your finger in there... also there was a TSB that came out for the 3650 and they have a different fill tag on the tranny so look if you have bought a used car you nvr know what might have been done to it. although i have seen anywhere from 3.25 to 3.75 really i assume it depends on the fluid and wear in your tranny i mean different fluids i know have different viscosity dont forget and for ppl wanting to know about the syncromax i hear good things i use the GM syncromesh since i put my MGW on and holy crap talk about smoother better shifting even when cold as stated above!!! if you are changing your shifter dont forget its always the prime time to change your fluid!!!

DOPEGT
hope you enjoy the new easy shifting and the new shifter will surely give you better feel jsut see if you can try a couple out B4 you buy. I have had a couple and love my MGW and had the triax on this car prior and there is still a huge difference with centering springs and shift firminess along with positioning but only you know what you like
GOOD LUCK and glad you have better shifting i know thw $12.65 i spent on the GM fluid was well worth it!