AX4N transmission overhaul

JEBRECHT

MEMBER
2007 FORD TAURUS
3.0L
6 CYL
2WD
AUTOMATIC
175,000 MILES

The Transmission is an AX4N 4F50N has failed. From reading other posts, (thank you everyone !) I am confident that the problem is the torque converter spline is stripped, so I understand what is involved with fixing that, just wondering how much I should do and which other parts to change out now while it is only a couple hundred bucks in parts
I am in the process of removing the transmission now. My question is I am looking at rebuild overhaul kits for the transmission, and parts. I would like to go ahead and get the kit and other parts on order.

So there are different levels of kits available. Should I go ahead and replace the bonded pistons, or is that overkill?
I am thinking to go ahead and replace the friction clutch plates
What other parts would you recommend that I replace while I have the transmission out?

The shift solenoids?
The EPC solenoid?
The lock up solenoid?
The chain?
The coast band?
The overdrive band?

Anything about the valve body and/or parts in the valve body?
Anything else?

The bands are relatively cheap, but the solenoids start adding up if I replace all of them.

Thanks so much for your advice,

Jeff

1 Reply

MASTERWRENCH

MECHANIC
258 POSTS

As long as the transmission hasn't experienced a catastrophic failure (lots of metal in oil), you are probably just fine replacing all the "soft" parts. By this I mean all the clutches, bands, seals and bearings (as necessary). Cleanliness is also extremely important when rebuilding an automatic transmission. It needs to be pretty much spot free inside when you're done with no signs of contaminants. It would also be a good idea to disassemble the valve body as much as possible to clean it out as well.