727 Teardown & Inspection

[jcslocum]

All,

I've been back to my shop and cleared away the grease to find any serial numbers. I found them on the edge of the pan mount. I returned home and got them searched and I found some interesting info? Chrysler used a 10,000 day calendar to record dates. This is odd and very interesting! So the date code of 6004 = 1/4/1978.

The plant and serial number give other interesting info as well.

This has allowed me to fully understand what to order for the "rebuild kit"; bands, clutches, steels and then add some extra bits to make a more durable. I also added a servo for the rear band as they are supposed to be somewhat fragile. I found some info on the front drum piston upgrade, so I ordered that as well. Last, I added a shift kit to the rebuild and think I have all the bits I need, except for the torque converter. Research on that is next.
------------------

Grow up, would ya.

 

[jcslocum]

Trans out.

My daughter helped with the removal. She happened to be home for the weekend.

 

[jcslocum]

Today was a good day!

I was able to sort thru the 2 transmissions today and pick the best of the parts I want to use to build 1 great trans. The old vs. new trans design makes some choices for me. The Moho trans being 12 years newer has seen some updates over the years, and the fact that is was a short tail trans with the parking brake on the trans. This kind of tail shaft is useless and determines that the back half of the old trans must be used, internally that is. That’s ok because the only parts that have to be reused over is the actual output shaft, 1 planetary gear set and some other bits. The hub on the gear set is a little smaller and matches the spline on the old shaft. The new gear is too big.

There are 2 planetary gear sets and I will be able to use the front one, which having 4 pinion gears, vs. 3 as above is much stronger.

The Moho came with some other “better” parts as well. The lever that actuates the front band is a higher performance part compared to the old trans. The higher ratio places greater gripping force on the band as well as engages it faster. The 3.8 ratio is much better than the 2.9. 3.8 lever is on the left in the last picture.

This was interesting and fun to do. I’m getting a much better understanding of how the magic is made in this dark and oily place.

The box of rebuild parts has arrived too!!

This includes all of the “parts cannon” pieces for a complete replacement of the wear parts and then some. 160$ for the standard kit to rebuild to factory spec or 206$ to build to heavy duty, quick shifting beast. This will make it ready for the Hemi transplant making about 400 HP.

Kolene steels that go between the clutches. Hardened and nitrided for high grip and low wear

Red Alto clutches with a high performance friction material to go with the above steels.

A reverse servo piston, which is a common failure point for the 727.

I measured the 2 oil pumps, and the old pump measures out better than the Moho pump. Odd as I thought it must be toast.

Rebuild and install should happen this weekend.

And a box of old parts for the scrap yard.

 

[413]

You are going to have problems here. Read earlier posts, you cannot mix and match planetaries on the 66 output shaft.

if you want a newer converter then everything forward of the planetaries needs to be from the Moho trans.

 

[jcslocum]

I got that about the planetaries. I will be using the original 3 gear one and not the newer version.

 

[Davea Lux]

Today was a good day!

I was able to sort thru the 2 transmissions today and pick the best of the parts I want to use to build 1 great trans. The old vs. new trans design makes some choices for me. The Moho trans being 12 years newer has seen some updates over the years, and the fact that is was a short tail trans with the parking brake on the trans. This kind of tail shaft is useless and determines that the back half of the old trans must be used, internally that is. That’s ok because the only parts that have to be reused over is the actual output shaft, 1 planetary gear set and some other bits. The hub on the gear set is a little smaller and matches the spline on the old shaft. The new gear is too big.

There are 2 planetary gear sets and I will be able to use the front one, which having 4 pinion gears, vs. 3 as above is much stronger.

View attachment 413604 View attachment 413605

The Moho came with some other “better” parts as well. The lever that actuates the front band is a higher performance part compared to the old trans. The higher ratio places greater gripping force on the band as well as engages it faster. The 3.8 ratio is much better than the 2.9. 3.8 lever is on the left in the last picture.

View attachment 413607 View attachment 413608

View attachment 413609

This was interesting and fun to do. I’m getting a much better understanding of how the magic is made in this dark and oily place.

The box of rebuild parts has arrived too!!

View attachment 413610

This includes all of the “parts cannon” pieces for a complete replacement of the wear parts and then some. 160$ for the standard kit to rebuild to factory spec or 206$ to build to heavy duty, quick shifting beast. This will make it ready for the Hemi transplant making about 400 HP.

Kolene steels that go between the clutches. Hardened and nitrided for high grip and low wear

View attachment 413612

Red Alto clutches with a high performance friction material to go with the above steels.

View attachment 413611

A reverse servo piston, which is a common failure point for the 727.

View attachment 413613


I measured the 2 oil pumps, and the old pump measures out better than the Moho pump. Odd as I thought it must be toast.

Rebuild and install should happen this weekend.

And a box of old parts for the scrap yard.

View attachment 413606

I would would keep those hard parts, might come in handy down the road for some other project. Old adage is mostly true that if you discard something, sooner or later you will need to buy it.

Dave

 

[70bigblockdodge]

Never toss non broken parts,.this is not GM crap.
I'll send you money to pack that stuff and send it my way.

 

[Terry Heddin]

Here's a really goo vid on rebuilding a torque flite;

 

[jcslocum]

Never toss non broken parts,.this is not GM crap.
I'll send you money to pack that stuff and send it my way.

I have taken your advice and separated the old bits from the 66
Trans that are useless today and put them in the scrap pile as well as the Moho bits that relate to the tail shaft and e-brake stuff.

Here's a really goo vid on rebuilding a torque flite;

I have watched it a few times already. Thanks for the link!

cleaning that case is tough work. The oils, heat and road dirt have made a nice tar covering that takes real work to remove. This stuff is baked on!

That tail shaft took about 1 hour to get cleaned up.

More work tomorrow between honey-do list things.

 

[3175375]

I have taken your advice and separated the old bits from the 66
Trans that are useless today and put them in the scrap pile as well as the Moho bits that relate to the tail shaft and e-brake stuff.



I have watched it a few times already. Thanks for the link!

cleaning that case is tough work. The oils, heat and road dirt have made a nice tar covering that takes real work to remove. This stuff is baked on!

View attachment 413908

That tail shaft took about 1 hour to get cleaned up.

View attachment 413905

View attachment 413904

View attachment 413902

More work tomorrow between honey-do list things.

View attachment 413903

View attachment 413906

I have had success in using simple green to remove from grime and crud.
It’s slow acting, but it works.

just as an example, I cleaned up the inner fenders on my 1965 Mustang. They were full of road tar, grit, sealant and other things. I soaked it overnight after spraying simple green on it. I then reapplied simple green the next day and used a nylon parts brush to get the crap off.
I must have gone through a gallon of it on each side.
The result was all the way down to the original paint. I even discovered the original grease pencil marks that were scribbled on the steel when the car was assembled.

it took me days to get both front inner fender liners done, but in the end I felt it was worth it.

 

[jcslocum]

I have also used Simple Green to do the kind of cleanup you have mentioned. I also have a small "home" steam cleaner that when used after SG has some time to soak in, just peels the underbody grime off. Amazing what heat can do to melt the crap!!

We are now moving to the build phase and will start another thread.