Transmission Oil? and Cooler?

[oak510_tahoe]

Planning to change the transmission gasket/filter. Couple of questions:

1. What type of Oil can I use? I want to switch over to Royal Purple. But do I use their ATF fluid? or does the transmission require something specific.

2. Does the truck already have an transmission cooler? If so are the lines connected to the radiator? I want to install an aftermarket cooler.

Thanks, this is a 2005 4x4 Tahoe.


*edit * found it:
http://www.tahoeforum.com/showthread.php?t=9746&highlight=transmission+oil

 

[dec322]

I'd like to know the answers to these questions. The link doesn't work now that they locked the whole site down.