Re: More 727 trans problems from dum-dum
[Re: radar]
#2641476
04/05/19 09:54 AM
04/05/19 09:54 AM
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Joined: Mar 2006
Posts: 9,973 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,973
MI, usa
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[quote=dvw]What thickness snap ring are you using? There are multiple thickness available. I believe .104" is the thickest. Dr
It’s a wave washer and it’s fifty thou thick. You can run the solid style snap ring like the one in the rear clutch. Then the ring will float upward in the groove. Doug
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Re: More 727 trans problems from dum-dum
[Re: radar]
#2641545
04/05/19 12:20 PM
04/05/19 12:20 PM
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Joined: Jan 2003
Posts: 26,477 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,477
Rio Linda, CA
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Pressure plate lathed for more clearance.
Last edited by John_Kunkel; 04/05/19 12:20 PM.
The INTERNET, the MISinformation superhighway
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Re: More 727 trans problems from dum-dum
[Re: moparx]
#2641967
04/06/19 01:24 PM
04/06/19 01:24 PM
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Joined: Jul 2007
Posts: 1,686 Philadelphia
radar
OP
top fuel
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OP
top fuel
Joined: Jul 2007
Posts: 1,686
Philadelphia
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In the alto power pack setup you can buy the pressure plate is .177 or something- dunno if its heat treated or chromoly or tool steel vs the stocker but to make it easy on the machinist doing me a favor I think mine will still be strong enough shaved flat at over .2”? The stocker is just under .280. That avoids measuring snap ring install clearance and chancing a stress riser in the corner from tool marks or whatever.
I have been doing and re-doing my math- with .045 clearance currently I can shave .037 to just barely get in spec at .082” I’m thinking a little extra room for the clutch to slip unapplied isn’t a bad thing since max spec for 4 plates is .151” My guy is coming to pick up the part and my instructions today. I’m planning to tell him I want .070 trimmed off which would give me just under spec until touching the wave snap ring and .115 total gap to flatten the ring. My tom hand book says to measure at the widest gap under the wave so that’d be at .115” which still leaves room to keep the piston seal in its bore as my fibers wear.
Sound like a good plan?
Also while the trans is out I have the slower lever in there- one line on it makes it a 2.9. I have a tf2 kit installed and kevlar bands. Obviously I haven’t yet experienced a 2-3 shift, the 1-2 was noticable but not harsh and didn’t slip. Should I be looking at a higher ratio servo lever and thicker band strut? Is tig welding a reinforcement on the strut worth doing? Again this is a healthy but mild 512 stroker but not a race car and on street tires.
Thanks Rdr
Last edited by radar; 04/06/19 01:28 PM.
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Re: More 727 trans problems from dum-dum
[Re: radar]
#2642179
04/07/19 08:34 AM
04/07/19 08:34 AM
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Joined: Mar 2006
Posts: 9,973 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,973
MI, usa
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In the alto power pack setup you can buy the pressure plate is .177 or something- dunno if its heat treated or chromoly or tool steel vs the stocker but to make it easy on the machinist doing me a favor I think mine will still be strong enough shaved flat at over .2”? The stocker is just under .280. That avoids measuring snap ring install clearance and chancing a stress riser in the corner from tool marks or whatever.
I have been doing and re-doing my math- with .045 clearance currently I can shave .037 to just barely get in spec at .082” I’m thinking a little extra room for the clutch to slip unapplied isn’t a bad thing since max spec for 4 plates is .151” My guy is coming to pick up the part and my instructions today. I’m planning to tell him I want .070 trimmed off which would give me just under spec until touching the wave snap ring and .115 total gap to flatten the ring. My tom hand book says to measure at the widest gap under the wave so that’d be at .115” which still leaves room to keep the piston seal in its bore as my fibers wear.
Sound like a good plan?
Also while the trans is out I have the slower lever in there- one line on it makes it a 2.9. I have a tf2 kit installed and kevlar bands. Obviously I haven’t yet experienced a 2-3 shift, the 1-2 was noticable but not harsh and didn’t slip. Should I be looking at a higher ratio servo lever and thicker band strut? Is tig welding a reinforcement on the strut worth doing? Again this is a healthy but mild 512 stroker but not a race car and on street tires.
Thanks Rdr .012"-.015" per friction is what most of us shoot for. So with 4 friction it should be .048"-.060" clearance. You easily tig weld reinforcement to the band strut .Make sure the ends of the reinforcement don't interfere with the band or band anchor.The ratio levers multiple servo force times ratio. The 3.8 or 4.2 seem to work well. The higher the ratio the longer the servo travels to engage the band. Doug
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Re: More 727 trans problems from dum-dum
[Re: A727Tflite]
#2643522
04/10/19 07:33 AM
04/10/19 07:33 AM
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Joined: Dec 2005
Posts: 1,495 Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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The old saying - “too many chefs.....”. Is this lou????
JAKES AUTOMOTIVE
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Re: More 727 trans problems from dum-dum
[Re: radar]
#2644713
04/13/19 11:55 AM
04/13/19 11:55 AM
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Joined: Jan 2003
Posts: 26,477 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,477
Rio Linda, CA
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Line pressure in Reverse increases by a factor of about three so the increased pressure helps weak parts that would fail at the lower pressure in forward gears.
If by "wimpy lever" you mean a low ratio like 2.9, setting it at 1.75 turns out is a bad idea...the lower the ratio the more turns out. For that lever go at least 2 turns or 2.25.
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