AWD Mountaineer ECU w/ 2WD AOD or 4R70W?

[Lee in Texas]

I have a complete 2000 Mercury Mountaineer(AWD) as a V-8 donor vehicle. Will there be any problem using its computer for my 2WD Ranger?

 

[cammeddrz]

Keeping it 2wd?

The PATS will need to be disabled if in a 1986, so whoever is in there modifying the tune could dump in a manual transmission tune.

Or you could get a 4r70w from a 2wd vehicle, and use the computer to run it. A beefier trans will be needed anyway.

 

[Lee in Texas]

Keeping it 2wd?

The PATS will need to be disabled if in a 1986, so whoever is in there modifying the tune could dump in a manual transmission tune.

Or you could get a 4r70w from a 2wd vehicle, and use the computer to run it. A beefier trans will be needed anyway.

I want to stick with auto trans. I had planned to get rid of the AWD 4R70W, but now I think I'll keep it as a rebuildable core for a 2WD trans.

I hadn't thought about PATS. Good info.

 

[win]

The Mounty PCM has no idea if there is, or is not an AWD transfer case at the back of the 4R70W.

Just needs to be a late version of the transmission.

Along with PATS, don't forget the higher pressure fuel system (55 psi) that PCM expects.

 

[cammeddrz]

The fuel system has no problems with pressure. the pumps ford used on the 1986 are capable of up to 90+psi. They are just regulated by the rail regulator to much lower. Ford even used the same pumps for all the V8 trucks too.

If anything, the problem will be because of the fact that the mountaineer uses a returnless fuel system. That has the regulator in the tank.

There are a couple solutions, some have modified fuel rails to have a rail mounted regulator, others retrofit the returnless pump into their tanks. Some have used universal, return style in line regulators, with the feed going in, the return going back to the tank, and then just a T in the feed line to the fuel rail. Some use fuel rails from an older 5.0, that have a rail mounted regulator.

All have benefits, and drawbacks

 

[Lee in Texas]

More good info. I think I'll use the returnless pump in the Ranger tank method.

I'm really glad I got a working donor vehicle. What a pain it would be to have to piece all this stuff together.

 

[cammeddrz]

If you do, know that the fuel level sender might use different ohm range, so your fuel gauge won't work correctly. The year split on that is right at 1986

 

[Lee in Texas]

Just when i was ready to write off the internet as a light-speed BS spreader...all this great info.

Another goal is new instruments.

 

[cammeddrz]

Just when i was ready to write off the internet as a light-speed BS spreader...all this great info.

Another goal is new instruments.

First-the Internet is a heavy BS spreader
second-you don't know, i could be feeding a ton of it to you right out my backside

The year split is right at 1986, so yours is likely going to be OK, but be warned that it might not be.

 

[win]

Yes, having a complete doner really helps with the small stuff.

I agree, using the Mounty in-tank FPR is likely the best path to getting the correct fuel pressure to the fuel rail. Differences in the top flange might preclude that option.

The flanges between my 02 Ranger and '96 Expo were not interchangeable so I have doubts the Mounty flange will fit on the much earlier Ranger tank. Going to an external FPR before the returnless fuel rail or using an earlier return style rail with an adjustable regulator might be required.