Bringing in the NYB for a new tranny.

[commando1]

Nothing wrong with it except it's leaking excessively now plus it's over 40 yrs old, so why not...

Minor dilemma.
If upgrading to Hemi components, how does it affect the shifting, if any?
Never drove a C-body with a HD tranny.

 

[Carmine]

Well you've already posted the same kind of pic I was planning, so nothing for me to do here except play it straight... Pun intended.

If you're only upgrading to Hemi internal wear parts, I don't think you'd perceive any difference. Now if you were using a different valve body and/or accumulater spring, that would alter the feel. Just using F-type fluid would give you a crisper shift.

 

[Big_John]

Nothing better about the hemi internals. You get an extra clutch disc and that won't buy anything for you. Being a 440 car, you should have the 4 pinion planetary gear set anyway.

Carmine is very correct on the type F fluid. It was explained to me by a Chrysler engineer that the type F had less slippage and would give a firmer shift. He said that Dexron was great for (in a southern drawl) "Mommy's Imperial so it didn't shift so hard when headed to the grocery store".

 

[moper]

The quality is a function of the parts used and the valve body programming. Hemi stuff IMO isn't worth the cost unless it's a resto deal. I have ripped the entire sprag assembly from the case (aluminum and all - not the steel parts) but that's with a lot of abuse. Have the transmission rebuilt completely, have the rebuilder install the Trans-Go TF1 kit, and voila you have a crisp shifting transmission that will last forever, unless you really, REALLY add power and traction, and then abuse the snot out of it.

 

[Rapidtrans777]

Well you've already posted the same kind of pic I was planning, so nothing for me to do here except play it straight... Pun intended.

Good plan Stan. Get out in front of the wisecracks!

 

[1978 NYB]

I just added a B&M 2400 stall converter and type F in my NYB during my engine project.

 

[Wollfen]

Poor Stan, we are all working on hopping up your transmission for you for harder shifting and higher horsepower, do you think we are leading you down a certain path? I'm going to keep quiet on this one.

 

[twostick]

The only thing majorly different about the Hemi trans is an extra clutch disc or two, 4 pin planetaries, the band apply lever and the governor.

The extra clutches won't hurt if they will fit in your drum.

I'll be surprised if your trans has 4 pin planets in it and I wouldn't waste time or money finding a set if it doesn't. The aluminum spline in the housing will fail long before you ever break a 3 pin.

The Hemi front band apply lever is a 5:1 and yours will be 2.something:1. The 5:1 lever used to be the preferred upgrade but is now somewhat frowned upon.

The hemi governor will move the WFO shift point up to about 5500 IIRC.

If it was my trans, I'd put in whatever number of clutches the drum will hold, a 3.8 or 4.2:1 band lever which will really firm up the 1-2 shift with a good shift kit and call it good.

Kevin

 

[Big_John]

The Hemi front band apply lever is a 5:1 and yours will be 2.something:1. The 5:1 lever used to be the preferred upgrade but is now somewhat frowned upon.

I knew there was something else I was forgetting.

 

[detmatt]

Here’s what I did to this one.

Here are the highlights
Here are a few of the improvements made to my trans. I found a used late '90s 46RE on Craigslist as a doner for some of the mods. The valve body got a shift improver kit and the oem steel check balls were replaced with the composite ones from the 46RE as they don't beat up the separator plate like the steel ones.
New TCI HP intermediate sprags.
New style dimpled input bushing in pump housing for improved oiling.
Replaced main output shaft bearing.
Back planetary set was replaced from the oem 3 gear set to the 4 gear from the 46RE.
Front clutch pack springs went from the 9 originals + 3 reds from the 46RE to = 12.
Front clutch pack bushing replaced with new updated grooved style for improved oiling.
Front clutch pack discs changed from 4 oem to 5 Alto-red .062 discs.
Back clutch pack discs changed from 3 oem to 4 alto-red .062 discs.
Kick down apply lever changed from 3.2 oem to 3.8.
New front and rear bands, good ones.
6 1/2" washers used as blocker in the low/reverse apply piston assembly.
Removed casting flashings from case(one was dangerously close to falling off which would have been disasterous)
This was all done by a close friend of mine whose a guru imo and I'm really looking forward to experiencing the performance of this trans

 

[75LandYacht]

Here’s what I did to this one.
View attachment 215839
Here are the highlights
Here are a few of the improvements made to my trans. I found a used late '90s 46RE on Craigslist as a doner for some of the mods. The valve body got a shift improver kit and the oem steel check balls were replaced with the composite ones from the 46RE as they don't beat up the separator plate like the steel ones.
New TCI HP intermediate sprags.
New style dimpled input bushing in pump housing for improved oiling.
Replaced main output shaft bearing.
Back planetary set was replaced from the oem 3 gear set to the 4 gear from the 46RE.
Front clutch pack springs went from the 9 originals + 3 reds from the 46RE to = 12.
Front clutch pack bushing replaced with new updated grooved style for improved oiling.
Front clutch pack discs changed from 4 oem to 5 Alto-red .062 discs.
Back clutch pack discs changed from 3 oem to 4 alto-red .062 discs.
Kick down apply lever changed from 3.2 oem to 3.8.
New front and rear bands, good ones.
6 1/2" washers used as blocker in the low/reverse apply piston assembly.
Removed casting flashings from case(one was dangerously close to falling off which would have been disasterous)
This was all done by a close friend of mine whose a guru imo and I'm really looking forward to experiencing the performance of this trans

Wow! Where’s this guys at? I’ll send mine in for a freshen up..

 

[detmatt]

Well unfortunately he’s retired but I don’t think any of it is rocket science. You could probably direct any trans guy to do the same if you provide the doner parts or it’s been said that they’re easy enough to diy with the right tools.

 

[1978 NYB]

I have looked in to adding an overdrive unit to my 727 in the NYB but I don't think it is possible without major mods to the floor pan.

 

[1978 NYB]

Stan.... I just put my glasses on.

That picture looks distubing...maybe not a Hemi tranny????

 

[commando1]

Good plan Stan. Get out in front of the wisecracks!

My first thought after writing the title was that I needed to neutralize Carmine right from the start. I was right.

 

[commando1]

Stan.... I just put my glasses on.

 

[commando1]

Quite a package you put together, Matt. Wow.
Reading the replies, I'm gonna go with the way the Cop/taxi units were built.
I have a book here with the specifics of the differences. Thanks.

 

[FURYGT]

My 2 cents is to add a deep pan like Chrysler put on some trucks with a drain plug. The extra capacity will help keep the trans cool.

 

[twostick]

Here’s what I did to this one.
View attachment 215839
Here are the highlights
Here are a few of the improvements made to my trans. I found a used late '90s 46RE on Craigslist as a doner for some of the mods. The valve body got a shift improver kit and the oem steel check balls were replaced with the composite ones from the 46RE as they don't beat up the separator plate like the steel ones.
New TCI HP intermediate sprags.
New style dimpled input bushing in pump housing for improved oiling.
Replaced main output shaft bearing.
Back planetary set was replaced from the oem 3 gear set to the 4 gear from the 46RE.
Front clutch pack springs went from the 9 originals + 3 reds from the 46RE to = 12.
Front clutch pack bushing replaced with new updated grooved style for improved oiling.
Front clutch pack discs changed from 4 oem to 5 Alto-red .062 discs.
Back clutch pack discs changed from 3 oem to 4 alto-red .062 discs.
Kick down apply lever changed from 3.2 oem to 3.8.
New front and rear bands, good ones.
6 1/2" washers used as blocker in the low/reverse apply piston assembly.
Removed casting flashings from case(one was dangerously close to falling off which would have been disasterous)
This was all done by a close friend of mine whose a guru imo and I'm really looking forward to experiencing the performance of this trans

You have to be careful mixing and matching planetaries from different years. The spline angles were changed at some point and while the parts might physically fit together, the spline engagement will be off.

From A+A's catalog:

Tech: 727 has three different spline angles, which is why we will ask what year the transmission/output shaft is. (1962-75, 1976-93, 1994-Up)

Kevin

 

[detmatt]

Well the trans works very well but I will mention that to him next time we talk.