I want to change the fluid in my tranny and I am hearing, Mercon V only!! then I am hearing under no conditions use Mercon V!!
What do I do ???
Someone please email me and tell me the right one to use.
1999 V10 automatic 4.3 gear 66k miles.

 

I would use the recommended ATF in this TSB:

http://www.ofoc.ca/garage/TSB%2001-15-7.pdf

 

What is the recommended ATF????????

 

The 4R100 with your V10 requires MERCON, not MERCON V, and not a fluid that has both MERCON and MERCON V ratings.

That's what it says in your owner's manual. I think they are right.

 

Thanks for that info

 

What about Mobil 1 synthetic ATF? Has anyone tried it on the V-10 4R100?

 

I don't know, but I would like to know...

 

just use regular Mercon, the bottle might read Mercon/Dextron, Mercon V is no good , i beleive it is synthetic. Its noted in the owner manual that Mercon and Mercon V are not interchangeable. Also on the Tranny Dipstick it should read what the truck take's ,mine is an 02 and say;s Mercon.

 

https://www.ford-trucks.com/articles...hangingatf.php

 

Look at your tranny dipstick... It should say which type.

Edmo

 

I use Mobil 1 synthetic ATF in my 4R100 behind a V10. Works great.

I think it is the best fluid choice for a 4R100 transmission. It has the MERCON rating, but not MERCON V. That's exactly what the 4R100 needs.

 

Thanks

 

Any idea how much the Mobil 1 costs /quart or /gallon?

 

Last time I bought some it was $4.99/quart.

 

Is it safe to switch from Mercon to the synthetic ATF?
My tranny has "Mercon".