Transmission service instructions please?

Okay. Thanks for your help.

Hi, I have the k1500 model. I am getting ready to change the transmission fluid. I tried tightening the bolts and wiped the pan down but it still leaks slowly. I am also going to change the filter and pan gasket. How much transmission fluid do I need? Also, should I use Dexron 3 or dexron 5 or dexron 6. Also, is is Castrol fine to use or should I get a different brand? Thanks.

I started to remove the tranny fluid pan only to discover that there are two bolts I cannot get at. The back two bolts are under the tranny cross bar(?). How do I get to these bolts so I can replace the filter? Help I'm stranded without my truck.

Thanks

1st if the filter and fluid have not been changed regularly then dont change it or you will mess up your trans but the best way I can think of is to put a jack under the trans. Then take the bolt out of the cross member going into the trans and then there should be four bolts 2 on each side of the cross member, remove those and the cross member should come out then you will be able to get to those bolts. good luck.

Here is a guide that will help

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

and

https://www.2carpros.com/articles/automatic-transmission-problems

Please run down these guides and report back.

Generally most of the particles of clutch material and metallic bits fall to the bottom of the pan and do not cause a problem in the transmission because they are filtered out by the filter. Don't be afraid to change the fluid and filter. Use the latest GM specified ATF which is DEXRON VI which supercedes DEXRON III as the recommended fluid in all GM automatic transmissions. It is a very rare event when a service ot the fluid causes a problem. You are way ahead of the game by replacing the old fluid that may have been overheated and the additive package may be depleated.