MT82-D4 rebuild thread

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NGOT8R

NGOT8R

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I was able to complete a couple of more disassembly tasks before I stopped working on it for today. I also learned something during the process.

Lesson/Things learned

I should have left the driveshaft flange on the output shaft before I removed the large threaded plug underneath the dust cap which sits just below the input shaft in the bellhousing. I didn’t do this and when I went to remove the threaded plug, the output and countershafts just spun. I ended up having to reinstall the ds flange back onto the output shaft and use the holding tool that prevents the output shaft from spinning. Problem solved, but not before damaging the Allen portion of the threaded plug. I’ll replace it with a new one upon reassembly.

The second thing I learned was what the backside of the large counterweight looks like. I’ll be deleting this and replacing it with a Calimer block off plate.

Specialty tools needed during these few steps were as follows:

- DS flange holder (to hold flange while removing the 30MM nut which bolts the flange to the output shaft)
- 30MM deep well socket (to remove ds flange nut)
- Slide hammer (to remove dust cover that sits over top of the large threaded plug in bellhousing)
- 12MM Allen socket (to remove large threaded plug behind dust cover in bellhousing)
- 3 jaw puller (to remove ds flange)

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Scootsmcgreggor

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wow thanks for the documentation, keep it coming!

I've wondered about that counterweight. What is its purpose?
 
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wow thanks for the documentation, keep it coming!

I've wondered about that counterweight. What is its purpose?
Thanks! Yes, I’ll continue to document the process.

I would guess that the counterweight is designed to help with NVH, although it is very noisy and loose feeling from the factory.

Here’s what Calimer says about it:

Our 2018 and up Mt82 Shift Weight Delete removes the clunky, heavy counter weight that is on the side of your stock transmission. This will improve smoothness in shifting and prevents the weight from falling off because of accounts of weak roll pins. Unbolt and bolt directly on our shift weight delete.
 

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Thanks! Yes, I’ll continue to document the process.

I would guess that the counterweight is designed to help with NVH, although it is very noisy and loose feeling from the factory.

Here’s what Calimer says about it:

Our 2018 and up Mt82 Shift Weight Delete removes the clunky, heavy counter weight that is on the side of your stock transmission. This will improve smoothness in shifting and prevents the weight from falling off because of accounts of weak roll pins. Unbolt and bolt directly on our shift weight delete.
I agree the counterweight is clunky and heavy (and ugly to boot). I would be interested in data on how many counterweights fell off, if it is a problem I will be looking for improved roll pins before I just toss it. Ford spent a lot of time and $$ to design and make it, they don't do that for no reason. It appears the counterweight performs a similar function to the weighted shift knobs that are well liked by many.
 

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and, Great Work! on your photo report of the transmission teardown! Thanks for leading the way. :)
 


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I agree the counterweight is clunky and heavy (and ugly to boot). I would be interested in data on how many counterweights fell off, if it is a problem I will be looking for improved roll pins before I just toss it. Ford spent a lot of time and $$ to design and make it, they don't do that for no reason. It appears the counterweight performs a similar function to the weighted shift knobs that are well liked by many.
Mine fell off. Not sure when but last year I noticed a bare shaft sticking out of my trans while doing my turbo install. After some research I realized it was the counter weight. It was a pain to remove the rest of the assembly while the trans was in the car.
20210620_072832.jpg
 
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5pointslowski

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Are you upgrading internals aswell? Saw you already had the AMP shift forks for the d4. Were any of the other mt82 parts interchangeable with the d4?
I just replaced my d4 due to faulty input shaft bearing so I’m gonna be rebuilding my old one over the winter.
Can you possibly post all parts you bought and where you hit them from?
 

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Mine fell off. Not sure when but last year I noticed a bare shaft sticking out of my trans while doing my turbo install. After some research I realized it was the counter weight. It was a pain to remove the rest of the assembly while the trans was in the car.
20210620_072832.jpg
It's difficult to tell from the photo, the shaft looks more like the weight was secured by a set screw (or two) than a roll pin.
 

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It's difficult to tell from the photo, the shaft looks more like the weight was secured by a set screw (or two) than a roll pin.
If you zoom in really close, you won't see any marks on the shaft. Looks like it was glued on.
Correction: I do see a dimple or hole on the side of the shaft. So you may be right or it's a hole for a pin.
I hate shit like this. I'm removing it when I do my transmission mods next year if it hasn't fallen off by then.

@NGOT8R following your progress. I love teardowns even though I don't have the tools, space, or skill level for such things as a transmission re-build.
 
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Are you upgrading internals aswell? Saw you already had the AMP shift forks for the d4. Were any of the other mt82 parts interchangeable with the d4?
I just replaced my d4 due to faulty input shaft bearing so I’m gonna be rebuilding my old one over the winter.
Can you possibly post all parts you bought and where you hit them from?
Yes, in addition to the billet forks I will be upgrading a few more of the internals, but I’m waiting to see how things look once I get it taken apart. Most likely there will be some new synchros, carbon lined rings and ceramic bearings (if I can find a good source for them). I will update the thread with parts as I acquire them.
 

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Yes, in addition to the billet forks I will be upgrading a few more of the internals, but I’m waiting to see how things look once I get it taken apart. Most likely there will be some new synchros, carbon lined rings and ceramic bearings (if I can find a good source for them). I will update the thread with parts as I acquire them.
thanks. I’ve been searching aswell and havnt been able to find much
 

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It's difficult to tell from the photo, the shaft looks more like the weight was secured by a set screw (or two) than a roll pin.
Pretty sure a pin went through to hold the counter weight on but to be honest I never paid any attention to it until I realized it wasn't there.
 
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If you zoom in really close, you won't see any marks on the shaft. Looks like it was glued on.
Correction: I do see a dimple or hole on the side of the shaft. So you may be right or it's a hole for a pin.
I hate shit like this. I'm removing it when I do my transmission mods next year if it hasn't fallen off by then.

@NGOT8R following your progress. I love teardowns even though I don't have the tools, space, or skill level for such things as a transmission re-build.
This is my first one, but I’m hopeful that I’ll be able to get through it without too much trouble. Regardless, I’ll report the good, the bad and the ugly (hopefully I’ll e counter a lot less of the bad and ugly) throughout the process, lol.
 
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I spent most of the day helping my buddy on a box Chevy truck build, but when I returned home, I figured, why not try and make some progress on disassembling the tranny. I did learn a few things along the way, until I reached a standstill with removing a couple of the detent pins. I was able to get the smallest one of three out, using a detent pin removal tool. I noticed that the outer portion of the tool was making contact with the tranny housing, and angling itself, as I tightened the tool in an attempt to draw the pin out. I stopped there and decided to try something a little different, on the off chance that it might work. What I did was use the detent pin removal tool as a slide hammer and believe it or not, it pulled the pin out. The pin was damaged (bent) during this process, but that’s not a big deal at all. I’ve resigned myself to just replacing all three for peace of mind. Having said that, the detent pin removal tool does not fit the two larger detent pins, so I’ll have to figure out how to proceed on removing those.

I moved on and pulled the tail/rear housing by removing the 15 E-socket bolts using an E12 socket and my long 2 jaw puller. Once the rear housing was removed, I was drawn to the shift forks and guess what? They’re aluminum. Hmmmm, I thought Ford had upgraded those in late 2018 models, as well as the 2019+ models. Anyways, here are some pics from today.

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Additional pics. The last one is referencing the two larger detent pins that I have yet to figure out how to remove without causing any damage to the tranny. I’ll get there eventually though.

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