I am about to change my Auto Transmission fluid and Gear oil, just
wondering what people are using in their auto transmission.

What product/viscosity they are using?

How many quarts are needed for the ATF and then for the Gear Oil?

I am looking at:

Royal Purple
Gear Oil
- Max Gear Synthetic Oil
(not sure which viscosity is best thought of summer and moderate temps)
75w/140,
75w/90,
85w/140
Which one is right for the automatic transmission on a van in high
heat long driving conditions?

Red Line
ATF
- High Temp Synthetic ATF
http://www.redlineoil.com/products_gearlubricants.asp?productID=54&subCategoryID=18&categoryID=8

Gear Oil ( Red Line)
- 75w/90 Gear Oil? Not sure which is what I am suppose to use?
http://www.redlineoil.com/products_gearlubricants.asp?productID=38&subCategoryID=15&categoryID=6

Lucas Oil
Gear Oil
- 75w/90
http://www.lucasoil.com/products/display_products.sd?iid=47&catid=12&loc=show&headTitle=%20-%2075/90%20Synthetic%20Gear%20Oil

Amsoil
Gear Oil
-75W-90 Long Life Synthetic Gear Lube
Product Code: FGRQT-EA
http://www.amsoil.com/storefront/fgr.aspx?zo=1132530
ATF
- Automatic Synthetic Transmission Fluid
http://www.amsoil.com/storefront/atf.aspx

Here is an interesting test and white paper done by Amsoil so it could
be biased but it does show how the their product after some tests does
beat out the others.
http://www.amsoil.com/products/gearlubes/WhitePaper.aspx ( you can
read it here without downloading)
It can be downloaded with this link:
http://www.modernoils.com/g2457GearOilWhitePaper.pdf

Can someone knowledgeable about gear oils read this and see if it's BS
or makes sense. From what I could see it states the Royal Purple and
Lucas oils have every high viscosity at high temperatures after a KRL
20Hr test but they claim that is not desirable to be compliant to the
SAE J306 requirements for SAE90 Gear oil. I am a little lost and needs
some interpret this please.

I am just trying to make an educated decision here.

Thank in advance.

Robert
NY 88 Auto With freshly rebuilt engine.
Tranny Rebuilt 3 yrs ago.