Who can work on a GM 4L30E transmission with me?

[Irving]

Haha, good to know.

[streetglideok]

Honestly, I cringe over those enthusiast auto sites. I could go on about the little bit of good info, and tons of bad info learned on there. You might find out about some common ailments from those sites, but guessing at the cause because it happens alot on a car is just another way for Murphys law to bite you. Ive seen some glorified parts installers use this approach with identifix. Sometimes you get lucky, sometimes you dont. Better off asking for automotive help on here, lol.

[GunsRBadMMMMKay]

If it has transmission cooler lines, you could try the poor mans method of flushing the trans. Get a couple lengths of hose, a couple buckets, and your oil. And a helper to turn the key on/off would probably help. Figure out which line is the out to cooler and which returns to trans. disconnect them, attach the lengths of hose, put the out to cooler line into an empty bucket and the in to trans into the other bucket and add the new oil. Run the engine and it should pull the new oil in while it spits the old oil out. Make sure you turn off the engine when the oil starts coming out clean or you run out of new oil in the bucket, and make sure you check the levels when your done. This is in theory but it worked on my car.

[THe Yetti]

To change the trans fluid: Get some cardboard or plywood and a large drain pan. Get a jack. Put the jack under the trans. pan and extend it until it touches the pan with just a bit of pressure to hold it. Then loosen all the bolts, remove all the bolts except those across the front of the pan, just leave them loose a few turns. Put the drain pan under the back of the trans. pan. Lower the jack and the fluid will dump into the drain pan. Some will splash out, which is what the cardboard is for. Then remove the front bolts. Clean the pan and change the filter. Put on a new gasket, no sealant. Reinstall the pan, torque the bolts evenly and not very tight. Then refill with fresh fluid.

[Irving]

Thanks for the step by step guys!