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Re: DIY 727 build questions [Re: Tig] #3061790
07/23/22 09:14 AM
07/23/22 09:14 AM
Joined: Dec 2021
Posts: 587
Loudoun County, VA
Brad_Haak Offline OP
mopar
Brad_Haak  Offline OP
mopar

Joined: Dec 2021
Posts: 587
Loudoun County, VA
All good feedback; highly appreciated wrench

Re: DIY 727 build questions [Re: Brad_Haak] #3061805
07/23/22 10:14 AM
07/23/22 10:14 AM
Joined: Jan 2021
Posts: 466
rust belt
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Moparite Offline
mopar
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rust belt
Another issue that is often ignored is the sprag or over running clutch. If it lets loose you could crack the case and you will be building another transmission(ask me how i know this). It's good insurance to get a bolt in sprag this will keep it from spinning and possibly cracking the case. Some also are built stronger than the stock ones and can handle more.

https://www.coperacingtrans.com/?product=crt-727-16-roller-drag-sprag

Re: DIY 727 build questions [Re: AndyF] #3061817
07/23/22 11:47 AM
07/23/22 11:47 AM
Joined: Oct 2003
Posts: 11,327
W. Kentucky
justinp61 Offline
I Live Here
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Posts: 11,327
W. Kentucky
Originally Posted by AndyF
I checked over the 727 in my Duster before the season and it only took a couple of hours to pull valve body, pull the pump, open it up and take a look. Everything looked good so I put it back together and checked the end play. Piece of cake once you have a few tools and know the drill.


Andy, why such low resolution on the indicator? LOL.

Re: DIY 727 build questions [Re: Moparite] #3061849
07/23/22 01:22 PM
07/23/22 01:22 PM
Joined: Aug 2003
Posts: 39,982
Bend,OR USA
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Cab_Burge Offline
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Originally Posted by Moparite
Another issue that is often ignored is the sprag or over running clutch. If it lets loose you could crack the case and you will be building another transmission(ask me how i know this). It's good insurance to get a bolt in sprag this will keep it from spinning and possibly cracking the case. Some also are built stronger than the stock ones and can handle more.

https://www.coperacingtrans.com/?product=crt-727-16-roller-drag-sprag

isn't that Sprague a stock Ford?
I seem to recall that being stated on here years ago: work: Sorry for not remembering the exact application, C6,C4 or ???


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: DIY 727 build questions [Re: Brad_Haak] #3061863
07/23/22 02:16 PM
07/23/22 02:16 PM
Joined: May 2008
Posts: 5,343
Aurora, Colorado
451Mopar Offline
master
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master

Joined: May 2008
Posts: 5,343
Aurora, Colorado
alternative to slide hammer for pump removal. Long bolts with large body washers, than use the "V" part of a large crow bar to slide along the length of the bolt like a slide hammer.
The trick to the front drum compressor is to have a flat surface under the drum. Two large "C" clamps can then be used to compress the spring retainer plate (just do it evenly.) A setup like shown with all thread in the center makes the job easier because it compresses/releases both sides at the same time.
Snap ring pliers, small flat blade screw driver for the servo and clutch snap rings, #2 phillips screw driver for valve body, Tail shaft phillips screws are easier to remove with an impact screw driver. Normal sockets and wrenches, mostly 7/16", 1/2", 9/16" sockets and larger wrenches for the band adjustment lock nuts.
If replacing bushings, a bushing driver kit. Usually at least replace the pump bushing and output shaft bushings.
Trans-Go TF-2 shift kit if doing a shift kit.
Under 500 HP, a regular Trans-Star trans rebuilt kit (tan clutches, untreated steels) should work fine. For higher performance, The Alto red eagle clutchs and kolene treated steel are normally used. There is also some in-between cost/performance options like the Green High Energy clutches.
There are different materials for the front band, I really couldn't tell all that much difference?, but I don't do alot of transmissions.
A 3.8:1 or 4.2:1 front band lever seems to work best.
An old paint can makes a nice support for the front pump, input shaft, and clutch assemblies then you can air test the clutch assemblies and measure clutch play with a dial indicator.
The large "C" clamp can also be used to hold the servos in place when removing / installing the snap rings, but a large vice grip welding "C" clamp is easier to use.
https://www.lowes.com/pd/IRWIN-VISE..._gIaoN-2kQaAvIAEALw_wcB&gclsrc=aw.ds

Re: DIY 727 build questions [Re: 451Mopar] #3062012
07/24/22 07:04 AM
07/24/22 07:04 AM
Joined: Jan 2021
Posts: 466
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Moparite Offline
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Quote
isn't that Sprague a stock Ford?

Not sure what you are referring to, The link is for "NEW FOR 727 TRANSMISSIONS".

Re: DIY 727 build questions [Re: Cab_Burge] #3062076
07/24/22 12:48 PM
07/24/22 12:48 PM
Joined: Sep 2003
Posts: 16,429
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder

isn't that Sprague a stock Ford?
I seem to recall that being stated on here years ago: work: Sorry for not remembering the exact application, C6,C4 or ???"



Cab, i remember reading in a magazine long ago about using a C6 sprag. i can't remember what magazine it was, but i'm sure it mentioned a C6, and it was used because it had more springs and rollers in it.
i wished that could be confirmed, or discovered i am full of bullpucky.
beer

Re: DIY 727 build questions [Re: Brad_Haak] #3062319
07/25/22 09:45 AM
07/25/22 09:45 AM
Joined: Jan 2003
Posts: 12,762
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
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Marion, South Carolina [><]
I don't have a trans fixture to hold it on an engine stand, but I do have a pair of chains and a roof truss. laugh2
It worked perfectly to drop in the clutch drums and front pump. Everything else can be done easily on a workbench. The weight of the drums makes it more difficult sideways.

trans chains.jpg

CHIP
'70 hemicuda...8 sec street car
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed
'71 Demon 340
'73 Chrysler New Yorker
'90 Chevy 454SS Silverado
'06 GMC 2500HD LBZ Duramax...toy hauler
Re: DIY 727 build questions [Re: Brad_Haak] #3062332
07/25/22 10:12 AM
07/25/22 10:12 AM
Joined: Jan 2003
Posts: 16,693
Western NC
440Jim Offline
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440Jim  Offline
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Western NC
Originally Posted by Brad_Haak

3. Do you have any preferred suppliers for these tools and/or standard & performance parts for the job?

I couldn't resist buying another tool. But it wasn't expensive and is different than I already have.

Amazon WINtool clutch spring compressor
I took some pictures from the one I bought. I would slide the jaws to about 4" ID for a TF727 front clutch (Tool max ~4.3")

Clutch_spring_Compressor-WINtool4.3a.jpgClutch_spring_Compressor-WINtool727.jpgClutch_spring_Compressor-WINtool.jpg
Re: DIY 727 build questions [Re: 440Jim] #3062376
07/25/22 11:59 AM
07/25/22 11:59 AM
Joined: Feb 2015
Posts: 1,762
CA
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crackedback Offline
top fuel
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CA
WV Bob's trans stand was best, Wheelbarrow

Awesome.

Re: DIY 727 build questions [Re: crackedback] #3065406
08/05/22 09:18 AM
08/05/22 09:18 AM
Joined: Dec 2021
Posts: 587
Loudoun County, VA
Brad_Haak Offline OP
mopar
Brad_Haak  Offline OP
mopar

Joined: Dec 2021
Posts: 587
Loudoun County, VA
FYI, I just received a copy of the 727/904 book by Tom Hand and it looks like it's also a good reference for DIY work ==> LINK HERE

Still waiting for the spring compressor like 440Jim showed above to arrive...

Last edited by Brad_Haak; 08/05/22 09:19 AM.
Re: DIY 727 build questions [Re: Brad_Haak] #3066190
08/08/22 10:57 AM
08/08/22 10:57 AM
Joined: Jan 2003
Posts: 73,990
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
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U.S.S.A.
Originally Posted by Brad_Haak
FYI, I just received a copy of the 727/904 book by Tom Hand and it looks like it's also a good reference for DIY work ==> LINK HERE

Still waiting for the spring compressor like 440Jim showed above to arrive...


I have the factory chrysler compressor ... which does double duty for pressing in the outer race of a rear sprag .... but in a pinch when rebuilding a power glide I made something out of a PVC pipe coupling that I was able to compress with a big C clamp we had at work.

That one that Jim shows would come in handy for many different types setups like that .


running up my post count some more .
Re: DIY 727 build questions [Re: Brad_Haak] #3066251
08/08/22 02:38 PM
08/08/22 02:38 PM
Joined: Aug 2003
Posts: 39,982
Bend,OR USA
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Cab_Burge Offline
I Win
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Buy yourself a 1965 to 1971 Mopar Factory service manual, the tranny section is invaluable scope: twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: DIY 727 build questions [Re: Cab_Burge] #3067060
08/11/22 12:47 PM
08/11/22 12:47 PM
Joined: Sep 2003
Posts: 16,429
north of coder
moparx Offline
"Butt Crack Bob"
moparx  Offline
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Joined: Sep 2003
Posts: 16,429
north of coder
an ATSG [Automatic Transmission Service Group] book is also a good guide for the do-it-yourselfer.
beer

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