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Old 02-18-2010, 04:12 AM   #1
Valdostavetteguy
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Default "99 Coupe transmission fluid change--anyone have a DIY link???

Looking for a link on how to change manual transmission fluid (preferably with pics).

I've seached and found treads on just about everything but changing manual transmission fluid on C5 coupes. I can swear I used one last time but can't find it.

If anyone wants to know, I'll be I'll be using 4 quarts of GM part # 88861800. I used AMSOIL ATF last time and I'm getting a leak somewhere (I may have the paper blocker ring issue).

Thanks in advance!
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Old 02-18-2010, 11:04 AM   #2
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If you have the blocker ring problem, the only fix for it is disassembly and repair of many failed components. The issues would appear with it jumping out of gear. I only know that Mobil1 ATF will not work for the BorhWarner tranny with the paper blocker rings. The '99's were not supposed to get the BW transmission but some did such as mine. Mine was manufactured July '98. Thinking I was being wise and wanted the top ATF in there, I used the Mobil1 and paid dearly for doing so. Since this was the 3rd major failure of the transmission, I gave up and replaced the whole thing with a Tremec rather than repair all the things I saw were bad. It was also cheaper to replace it, than repair it.
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Old 02-18-2010, 11:13 AM   #3
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Maybe I just have a gasket leaking because the car shifts good (a lil ruffer than normal but probably because fluid may be low).

I'm still going to replace with the GM fluid and see if I can find the leak (small drops on the floor from day to day).

Anyone have a how to change tranny fluid link with steps???
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Old 02-18-2010, 11:52 AM   #4
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I can tell you how I did my 04 but I do NOT have pictures. Your 99 should be exactly the same. It's real straight forward.

Put the car up on stands front and rear with the rear about an inch lower than the front so the fluid will drain as completely as possible.

The drain plug is on the bottom rear of the trans on the passenger side pointing toward the rear of the car. Remove the plug and drain the fluid.

Reinstall the plug and tighten to 20Ft-Lb.

Remove the fill plug which is located on the drivers side of the trans approximately half way from front to rear and top to bottom of the trans case. Use a 3/8 square drive.

I used a plastic pump that I bought at a local parts store to pump the fluid from a 1 gallon jug into the fill hole. Mine took about 3.8 quarts to fill. Its full when the fluid wants to flow out the fill hole.

Reinstall the fill plug and tighten to 20Ft-Lb.

Take the car off the jack stands and drive it.....
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Old 02-18-2010, 12:05 PM   #5
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thanks so much.

I've done it before, just wanted to be sure I wasn't missing anything.

The only change I'll make is to take the fill plug out first just in case I can't get it out for some reason.

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Old 02-18-2010, 02:09 PM   #6
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Just make sure you can get the fill plug out before removing the drain plug, it insures that you can fill it back up again.
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Old 02-18-2010, 09:29 PM   #7
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As mentioned above, the paper blocker rings won't cause a leak.

Do you know where your leak is coming from? There are really only two seals on the transmission and replacing either one requires dropping the tranny. But, the diff axle seals and vent are both very near the rear tranny seal and both very prone to leaking (I lost my left axle seal during a race back in 05).

If it is in fact a tranny leak, it is possible is that the old fluid had sludged up isolating the seal from fluid and the seal dried out and cracked. When you put in new fluid (probably would have happened with any fluid), the new fluid cleaned the sludge exposing the dried sludge to oil, thus causing a small leak.

AMSOIL fluids are blended so that they cause a very slight swelling of porous material such as seals, but after this amount of time I'd suspect your seal has already swollen as much as it is going to and at this point your only options are to live with or replace the seal. Of course you can try another fluid as a cheap interim fix, but I really doubt it will help.

Unfortunately, this is one of the many reasons I recommend early and then periodic transmission fluid changes.
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Old 02-19-2010, 12:59 AM   #8
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I'll let everyone know where the leak is coming from when I get her on a lift soon...
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Old 02-19-2010, 02:30 AM   #9
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Here's the procedure from the manual with some diagrams that might help

Document ID# 765021
2002 Chevrolet Corvette
________________________________________
Transmission Fluid Replacement
Draining Procedure


Click the image to open in full size.
1. Raise and suitably support the vehicle; ensure that the vehicle is level. Refer to Lifting and Jacking the Vehicle in General Information.
2. Clean away all dirt and debris from the transmission fluid drain plug area.
3. Remove the drain plug.
4. Allow the system to drain.
Filling Procedure
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
1. Install the transmission fluid drain plug.
Tighten
Tighten the transmission fluid drain plug to 27 Nm (20 lb ft).


Click the image to open in full size.
2. Clean away all dirt and debris from the transmission fluid fill plug area.
3. Remove the fill plug.
4. Fill the transmission with DEXRON-III transmission fluid, until even with the bottom of the fill plug hole.
5. Install the transmission fluid fill plug.
Tighten
Tighten the transmission fluid fill plug to 27 Nm (20 lb ft).
6. Lower the vehicle.
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Old 02-24-2010, 12:52 PM   #10
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Well, I finally put her on a lift and the leak is coming from the bottom of the rear transmission gasket.

I emptied out the relatively new synthetic tranny fluid and refilled with older Dextron III type.

I'll let you know w/i a week how the leak compares with the different fluid (I'm guessing no change).

By the way, since the leak is so small (a teaspoon every 10 days), would anyone recommend trying some tranny leak stop the next time I need to add fluid (probbaly a year from now)???
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Old 07-17-2013, 05:32 PM   #11
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Anyone have the instructions and amount of fluid needed for an automatic transmission oil change for a 99 C5
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Old 07-18-2013, 10:03 AM   #12
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do yourself a favor, go to harbor freight and buy the 6 dollar fluid pump.
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Old 07-18-2013, 10:03 AM
 
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