e40d with p1728 and no 4th gear when warm - Ford Powerstroke Diesel Forum
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Old 01-02-2014, 08:24 AM
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e40d with p1728 and no 4th gear when warm

So big hello to you fellow psd. I have an issue with my 95 psd that was looking for some advice on.

I purchased a 95 psd crew cab long bed 4x4 about 3 years ago, from a friend who did alot of mods to it.

Truck runs very strong, chipped with an old superchips program, propane, front mount intercooler, full exhaust, and some other goodies, truck will outrun a 6.0 no problem.

But have had my few issues with it. about a year ago, my line pressure solenoid died, so ordered up a new solenoid pack from ford, installed in with new filter, flushed trans fluid, cause I work at a dodge dealer, so I have access to a lift and trans flush machine. Everything was good after that, then about 6 months ago, icp sensor died. replaced that and once again, truck shifted fine.

Called my buddy, when icp sensor died, explained the hard shifting, he told me he had installed a shift kit, last time he rebuilt the trans at 180k, sitting at 223k today.

ICP has been replaced, fuel economy has taken a dive, and this weekend, when driving home, hauling heavy furniture in the bed, od light started flashing. And i lost 4th gear.

So limped it home, in 3rd. Got to work, and read the code, p1728 is all I have.

Cleared the code, and shifting is back to normal, I dont drive the truck very far, since I live 3 miles from work. It never sees overdrive, trans fluid is full, and starting to turn dark.

I have a billet torque converter waiting to be installed. But my question is, my 4th gear ready for rebuild again.

I was told by former owner, that this specific trans needs to be overhauled roughly every 80k, since it sees alot of heat. I trust him, since he owns a trans shop.

But he is too far away for me to take it to him. So what do you guys suggest?

I only lose 4th gear when warm?
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Old 01-04-2014, 05:47 AM
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I think mine may be doing the same thing. When the od light starts to flash does the shifting get rough and it feels like it's slipping?

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