ymc226

Now that I've changed the air filter, oil, spark plugs and will change the serpentine belt and flush the brakes on my 2007 997.1 GT3, I've got a question on tools needed for changing the transmission oil.

The confusion is regarding the 997 GT3 vs non GT3 transmission which may or may not be different.

This post https://rennlist.com/forums/gt2-and-...ferential.html was based on a 996 GT3 which was applicable to 997 GT3s while this post https://rennlist.com/forums/997-foru...il-change.html was based on a 997.1.

My 2 questions are:

1. are the drain and fill plug locations the same? Not having worked on cars before but feeling the satisfaction of not feeding the stealership, I'd like to continue the same.

2. the GT3 DIY shows a 10mm hex allen tool is need for both the drain and fill plugs while the non-GT3 needs a 24mm socket.


I've put away my car for the winter and cannot remove the underbody panels so don't have a way to look. Can anyone with a 997.1 GT3 who has performed the transmission oil change verify which tools are needed?

Spyerx

10mm hex for both. It's a major PITA to get to it, I use a 10mm bit with a 10mm torque extender with a ratchet. You can also use a 10mm bit with a combo wrench.

ALWAYS PULL THE FILL FIRST!!! You don't want to drain and not be able to open fill.

The fill is on the side up near the transmission cooler.

See this thread.
https://rennlist.com/forums/997-gt2-...ssion-oil.html

You need a pump to get the fluid up in there, fill till it's full.

Use Delvac or porsche factory fill.

CosmosMpower

There's a huge Allen wrench you can order off amazon for this.

ymc226

Coming from you, this statement gets me worried. Is it because of the tight clearances and need to generate enough torque? Thanks for the link to that thread.

I think Enthusiast used Mobilube PTX. Looking at the Suncoast Parts site for MY 2007 GT3, it lists both the Delvac and PTX as purchase options for gear oil.

Anyone else use PTX instead of Delvac? I'm thinking about trying it out to correct the notchiness going into 1st gear when it's cold. There is a thread on the 997 forum regarding good responses to PTX but I don't know if it's applicable.

Spyerx

It's just tight access and for some reason these get stupid tight. Some can make a 10mm hex wrench L type with a socket and an extension on the end for extra leverage to,work. You can't get a socket style Allen in there, won't fit. And if you're doing on your back under the car on jack stands it's claustrophobic. I just let my shop do it now. I do my old cars tho. Easier access no belly pans

I believe the ptx is factory fill. It will have better cold performance. Delvac is notchy when cold but warm and hot performance are very good.

This thread has some details
https://rennlist.com/forums/997-gt2-...or-delvac.html

Polarcharger

This is a straightforward DIY.

Be sure your car is well supported before you crawl under it. As Spyerx says, be sure to pull the fill plug first. Pumping the fluid can be messy if you don't have a good pump.

Factory fill PTX is best if you're looking to optimize cold performance. While Delvac is excellent when warm, and is liked by those who track their cars (as is Red Line), you'll likely be happier with PTX before fluid fully warms.

Dervish

This ^^^. Get yourself a good pump or you'll end up with a lot going back down your arm...

NAM VET

I just wonder, having one of those big allen wrenches from some other car, if I needed to use it, I would take it to one the local machine shops, who have made up things for me in the past, and have them cut off the short end, leaving just enough to put it in a drain or fill plug, and then slip a socket on the long end, to enable me to use it.

Frankly, though, our GT3 has fresh transaxle fluid, and when necessary, I am likely just to have someone else replace it.

That's one of the nice things about being able to work part time when I want to, I just mentally convert the pay/time to what it would take me to do some sort of project. I have rebuilt and modified cars and powerplants since the mid-60's, and for me, much of that sort of "fun" is a "been there, done that" endeavor.

At this time in my life, just turned 69, I would rather smoke a nice salmon steak, or sip on a merlot and look out over the salt marsh, or maybe hit the reloading bench for awhile, or perhaps just take a nap.

Wishing all of you the very best for the coming 2016 year, and that Clemson beats OK tonight. Two of my kids are Tiger graduates.

as always, all the best.....

NV

audipwr1

Search here for a post by me about this with Amazon link

The large 10mm long handle hex works perfectly in this situation

Polarcharger

I like NAM VET's options for alternative uses of time.

If you do change transmission oil, this is another good Allen head choice:

Sweeper

This is the ticket I use Swepco 201 in mine.

ymc226

Thank you for all of your suggestions. I'm rather old (49) to just beginning to work on this car. Before this, it was drop off at the dealer, do all that they suggested, feeling ripped off but overall, not dissatisfied that my car was safe to drive.

Now that I do all the work myself, I really don't consider it work but that may change in the future. I find it just as enjoyable in buying all the correct tools which make short work for all of this basic maintenance.

ymc226

PTX comes from Suncoast in quart containers.

Are these considered good/adequate pumps?

Sweeper

\
Yup those will work..

Spyerx

One thing I forgot to mention. Getting the belly pans off while on jack stands is a pita!!! Putting them back on is even worse.