Guys I tried to do a search but it won't let me for some reason. I have a 99 350 7.3 4x4 dually. The previous owner must have lost the owners manual. How much tranny fluid do I need to buy for this truck? What fluid do you recomend?

 

get 18 qts mercon atf, start with adding 16. don't forget to drain the torque converter. it has a drain plug in that too. then just add from there, ALWAYS check trans fluid at operating temp. 150-170 degrees.

 

Here is the link to the transmission fluid change, excellent info. The 4R100 tranny holds almost 18 quarts. Many folks buy 20 quarts to be on the safe side.

https://www.ford-trucks.com/faq/1999faq/Maintenance-AutoT.htm

hope you find this helpful

I use Schaeffer's synthetic transmission fluid - It's what BTS uses so it's good in my book.

 

Here's the same article on FTE:

https://www.ford-trucks.com/article/...nsmission.html