I've recently picked up a '57 Apache, and I'm getting ready to replace the transmission fluid, and wanted confirmation I was looking at the right spot for the refill.

Can anyone please confirm in the attachment the red arrow is pointing to the fill plug hole, and SAE 90 is the right fluid? Looks like 6.75 pts?

If I'm right and that is the spot - seems tedious to get that filled up, any best practices to ensure I don't end up with transmission fluid all over my garage instead of in the truck would be appreciated.

That is the fill / fluid level plug. You can pop the shift lever out & pour fluid in top.

SM420 4-speed

Fill to the hole level, if topping up having warm oil in the transmission.

Fill to about 1/2” below the hole level, if adding all new/cool fluid to the transmission (or, 6 pints, supposedly).

http://chevy.oldcarmanualproject.com/shop/1954truck/54ctsm0005.html

Thank you for the responses!

You should be able to buy the correct fluid in a 2 quart size container that has a small spout that fits easily in the filler hole. Just squeeze it in until it starts to run out the hole. If you are replacing the entire fluid, it will just take a while.

Lee.