Gentlemen,
Will a 1996 powerstroke E4OD transmission fit a Navistar 7.3 idi? Is the bolt pattern the same on the powerstrokes? I found a rebuildable transmission I think.

Thanks,
Fred

 

The url for the CraigsList advertisment: 1996 powerstroke E4OD transmission

 

Bell housing bolt pattern is the same... But I know zip about the E4OD, so I have no idea if there were PSD differences or if they onterchange, but it will bolt up...

 

After doing some research I've discovered a flex plate/torque converter difference between the PDS and the idi. From my reading, the PSD has a six stud flex plate to torque converter mounting system whereas the idi has a four stud flex plate to torque converter mounting system. Now for the questions:

1. Will the idi torque convertor slide on the PSD e4od transmission? Are the splines compatible?

2. If the idi torque converter won't work on a 1996 PSD e4od, will a PSD flex plate bolt up to my idi crankshaft?

Any advice would be greatly appreciated.

Thanks,
Fred

 

Trans should be the same minus some internal upgrades. Would just need an IDI converter.

 

^^^ What he said. The powerstroke transmission will actually be a better transmission. Just swap out the torque converters and you'll be fine.

 

Not sure about the computer, though -- will an IDI's E4OD computer work with a later model E4OD designed for a PSD?

 

And, holy crap, $175 for a rebuildable E4OD? I'd be all over that.

 

It's all about sensors and input. The computer takes care of the shifting. The engine itself has nothing to do with it.

 

My concern would be whether the later E4OD's sensor output is the same format as an earlier one, and whether the electrical connections are the same. But otherwise, yes -- I'd think if you use your IDI's computer and not the PSD's, you should be ok.

As for the engine having nothing to do with it, I disagree. The PSD and the IDI are very different engines, with different torque curves. The IDI's peak torque is at 1400 RPM, whereas the first-gen PSD's is at 2000.

Thus, I would think the shift points would be different for the two engines, necessitating different programming for the two computers.

 

Pre 95 uses a different solenoid pack. Swap out the pack. (Replace it with a new pack) Use the updated transmission range sensor and your done.

 

Actually a lot of the difference in the psd e4od and idi e4 was more of doing away with the bugs and problems in the early e4's. Changing the solenoid pack and upping the line pressure was one of the things they did to give it a firmer shift and would last longer for people that pulled a lot. I don't know anything about the psd e4 except what i have leaned reading about my e4.

There's a lot of info out there read up on it.

 

And that would be where the engine-specific computer would come in to play. The transmission doesn't know anything about torque curves, it only does what it is told to by the transmission computer. The computer is what takes all the input from the truck's sensors and computes them into shift points.