JimmyLee

My 1,300 mile GS automatic does a rough shift down into first for the first two stops, but is fine after that, for the rest of the day. A friend suggested that I switch to a synthetic oil. Any thoughts?

Bill Soda

Just did mine in the driveway, changed filter, wiped out the pan and filled 'er up with Dexron VI. No problems & a smooth shifter to boot. Personally, synthetic is not the answer...you might have something else.

Dendk

A flush is how the dealerships do it, old fluid is collected on one side, fresh goes back in the trans...the days of dropping pan on these with normal circumstances are done

Gering

I have the trans & diff drained and filled every 20,000 miles, trans also gets a new filter & maybe a new gasket, if needed. Then I have the brakes, power steering, & engine cooling system flushed. Over 120,000 miles on the Vet so far.

If you are going to drain, drop the pan, & change the filter on the trans, then I would drain and fill the diff to.

HOXXOH

With only 1300 miles, I'd suggest letting the dealer diagnose the problem. I'm guessing your friend won't pay for a new tranny if you ruin it by using the wrong fluid.

Gering

I read the OP's post a little to quick. So the above answer is very good.

Good Luck OP!

Street Rat

I changed mine myself but not until 25,000 miles. I don't think a fluid change is the answer to your problems.

Ketchum

It came with synthetic. It came with a pretty high dollar,well formulated synthetic. You have another issue. Don't alter or screw with it if its under warranty. Too many hands in the fire and all that.

KenHorse

Good thing as a Vette tranny doesn't have a pan to drop!

Gearhead Jim

What's that thing on the bottom of the automatic transmission which they remove to change the tranny filter? My 2009 Service Manual calls it a "Transmission Fluid Pan".

raider4251

My dealer recommended changing the fluid in lieu of flushing.

Easy Rhino

???

Uh, yes it does. That's how you replace the ATF filter (and pull the valve body if needed).

S'vette

All trannies drop their pants (pans).

Ketchum

I always hook all my vehicles to a fliud exchange machine. Have for years. Then I do the filter at the mileage interval specified in the owners manual more or less. I did a complete fliud exchange on my 2006 about 30k. I think it was actually 29k cause it was in the shop and they had a good price on the procedure. I have sold and handled literally thousands of fliud exchanges in years past. Replacing 95% of the fliud is a trans life saver.

glass slipper

Your dealer is correct.

glass slipper

We've been over this before, you are wrong. The owner's manual does not say to do a "fluid exchange" nor does the Factory Service Manual say to do a "fluid exchange". There's no way a "fluid exchange" replaces 95% of the fluid unless you use 50+ quarts of fluid...you just pulled that number out of a dark, stinky hole.

Ketchum

You can do a 'fliud exchange' It is not a 'flush' . It is changing the fliud. Old fliud out,new fliud in. The terminology FLUSH is used quite frequently. There is a difference in FLUSHING and using a machine that EXCHANGES fliud.

Ketchum

Yes we went over this before. I proved you wrong then on most everything that came out of your face. Do you need to review those old posts. Lots of things in the way of maintance and repairs are done that are not specified in a owners manual. Most busy shops have fliud exchange machines. They are in use many times daily from sea to shine sea. I had mine done at a Corvette specialty store for $129.95. I'm not going to 'debate' you again on a forumn. So spit out what ever.

2006c6keller

On my 06 C6 A6 the fluid was ???===> overfilled. I had a top technician at a DFW Vette speed shop test my car for a differential problem. He mentioned that the trans was very, very slightly not shifting smoothly as it should. I had it into a dealer shortly and checked the fluid by removing the plug from the middle of the bottom of the pan. Guess what, the fluid was gushing out with lots of bubbles in it. It had been overfilled from the assembly plant. The plug goes straight up into the center of the trans pan, when removed, the fluid overflows a vertical pipe and the top end of the pipe is at the full level. We let it drain out most of the way with few bubbles still coming out, we knew that there were still some other bubbles in the fluid so we did not completely drain it to full level but close with a small flow left. After driving a short time, the bubbles were out of the valve body, and cooling lines, etc.

As a result, the trans started shifting smoother, shifting problem solved, I had something like 50K+ miles on it. This what happens when you get a REAL PRO checking the car, that is Anthony at LG Motorsports, whose boss specializes in racing Corvettes on the ALMS GT2 division circuits, lately. You know the LG Pro Long Tube Headers, etc. Of course, you have heard of Lou Gigliotti, he has a long history in pro racing beginning in 1971.

2006c6keller

See my above post (19) for an idea!