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Replaced the reverse band *PICS*

Started by grdprx, February 20, 2009, 03:03:42 PM

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grdprx

February 20, 2009, 03:03:42 PM
Got the tranny a few months ago.  Was going to drain it and put a new filter in it to get ready for my engine install.  Pulled the pan, there was a rectangular piece in the pan.  Not good.  It holds one of the bands in place, so I was poking around to figure out how to put it back, and why it came off...  Pulled the valve body off, the rear band is broke.  :brickwall:  :brickwall:

I'll post the pic, but my question is; can the band be replaced without disassembling everything?  This is over my head if i have to take the shaft out and all that jazz.  Would i be able to get the band out and wrap a new one around?

Thanks guys.

John_Kunkel

#1
February 20, 2009, 05:20:35 PM

Nope, the entire front of the guts has to be removed...the rear band is the last part to come out.
Pardon me but my karma just ran over your dogma.

grdprx

#2
February 20, 2009, 10:10:12 PM
awesome, thanks John.   Is there a book that would give instructions?  Kind of like that Big Block Mopar Engines book?

RD

#3
February 20, 2009, 11:57:12 PM
67 Plymouth Barracuda, 69 Plymouth Barracuda, 73 Charger SE, 75 D100, 80 Sno-Commander

grdprx

#4
February 21, 2009, 01:52:17 AM
Cool, thanks!

Is this broken band a sign of other possible issues?  It turns fine and there was almost no shavings in the pan when I emptied it.  It's very clean, I was quite pleased with it's condition besides this problem.

RD

#5
February 21, 2009, 11:08:46 AM
sometimes bands just break.  metal is prone to fatigue over time and usage.  those rear bands are cast and the cast could have had a fragile point.. or, it was just its time.  bands cant last forever, so i wouldnt be too worried about it.

when you do get your transmission rebuilt, make sure you do a pressure test on the rear servo to ensure its within specifications.
67 Plymouth Barracuda, 69 Plymouth Barracuda, 73 Charger SE, 75 D100, 80 Sno-Commander

John_Kunkel

#6
February 21, 2009, 07:56:49 PM
One thing that helps bands break is a too loose adjustment, when the adjustment is loose the servo piston has to travel further and "gets a run" on the band lever and hits it harder than if the band adjustment is tight.

When the trans is cold and is shifted to Reverse the band can be subjected to as much a 7500 pounds of force.
Pardon me but my karma just ran over your dogma.

grdprx

#7
February 21, 2009, 10:30:17 PM
Contemplating what to do.  Is it terribly difficult with the manual and that book to replace this band?  Any special tools required?

Regarding the pressure test on the rear servo, how do you do that?  Or are there instructions in the book?

I am on a budget, like everyone; and I had a goal of firing up the engine on my 30th birthday, in one month.  This sorta threw a wrench in that, literally...    :icon_smile_dissapprove:

RD

#8
February 21, 2009, 11:30:26 PM
Quote from: John_Kunkel on February 21, 2009, 07:56:49 PM
One thing that helps bands break is a too loose adjustment, when the adjustment is loose the servo piston has to travel further and "gets a run" on the band lever and hits it harder than if the band adjustment is tight.

When the trans is cold and is shifted to Reverse the band can be subjected to as much a 7500 pounds of force.

right on the money there.. have seen that happen.

the rear servo has a plug screwed into the outside of the case where the servo is at.  use a pressure gauge and attach it to this port w/the plug removed obviously. and engage the rear band by putting the trans in 1st or reverse after you get it rebuilt.  it will provide you with a pressure reading at this point of engagement.
67 Plymouth Barracuda, 69 Plymouth Barracuda, 73 Charger SE, 75 D100, 80 Sno-Commander

oldkimmer

#9
February 22, 2009, 04:23:17 PM
.................If u would post ur location, there may b a member close that can help u................kim..........
Back in the good old days 1968 charger rt 440 magnum . 1968  charger 383 magnum. The Beast has been Unleashed!!!!!!!!!!!!!!

grdprx

#10
February 22, 2009, 05:16:49 PM
That'd be cool, I'm in Kent Washington; south of Seattle. 

grdprx

#11
February 28, 2009, 12:58:31 AM
I did it!  All by my self!  "I'm a big kid now!"

Any who, I'm completely thrilled with myself; borrowed a slide hammer and snap ring pliers. Got 'er done.

grdprx

#12
February 28, 2009, 01:00:09 AM
More

grdprx

#13
February 28, 2009, 01:03:30 AM
More.

grdprx

#14
February 28, 2009, 01:21:56 AM
Only had one minor issue with the reassembly.  I didn't put the reverse band in right, since I didn't remove is from it's propper position.  Had to take the rear drum back out, and it pulled the gear out with it; unseating all the accordion like things out of the "race"  (I think that's what it's called).  Anyway, I was able to figure it out after 20 min of cussing.

The rest went in just as it came out.  Good times!  :cheers:

John_Kunkel

#15
February 28, 2009, 04:38:22 PM

Good learning experience but you removed way more components than needed to replace the band. The tailhousing and output shaft could have remained in place and, when removing the output shaft, it isn't necessary to remove the ball bearing, governor support, etc. They're usually removed as an assembly and only the governor internals removed for cleaning.
Pardon me but my karma just ran over your dogma.

A383Wing

#16
February 28, 2009, 04:59:41 PM
I may be a little late on this, but I'll put my  :Twocents: in here....years ago we had a '68 Barracuda and the reverse band broke 3 times on us....finally found out why.....engine cold in the morning was on fast idle...wife had to put it in reverse to get out of driveway to go to work....trans band would not take the fast idle from park to reverse constantly....the trans shop I contacted said on a fast cold idle we should put it into drive first, then go into reverse....

Never had another broken band after that....

....and the engine was a 225, not a V8....bone stock Barracuda...

grdprx

#17
February 28, 2009, 10:40:00 PM
Hey John, I thought about that, not having to remove the rear stuff; but the book showed the band being pulled out after the shaft was removed..  I had fun, disassembly took less than 2 hours for a novice.  Didn't want to get stuck having to go back cuz I missed a step, or get lost on reassembly.

I got the tranny off craigslist, so I bought it broke..  :brickwall: Drove to Seaside, OR too!   The stories I'll have with this car.   :icon_smile_big:  Got the 440 from Poulsbo, WA.
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