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Calling all 727 Trans. Guys..
#154395
11/21/08 09:21 AM
11/21/08 09:21 AM
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Joined: May 2005
Posts: 128
usa
mrmopardan
OP
member
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OP
member
Joined: May 2005
Posts: 128
usa
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I noticed when I get on the throttle hard & I am manually shifting (5000 + rpms), my trans. slips when shifted into 3rd gear. Under normal driving it shifts perfectly either manual or auto. I have a auto/manual shift kit & a new 9.5" Dynamic convertor. KD linkage seems to be adjusted O.K. I run a deep pan with new fluid, filter & trans cooler.
Your initial thoughts..
68 GTX Full street trim, solid lifter cammed. Best 11.34 @ 121 mph. 1.72 60 ft. (yeah I know.. my 60 ft. sucks)
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Re: Calling all 727 Trans. Guys..
[Re: JohnRR]
#154397
11/21/08 11:10 AM
11/21/08 11:10 AM
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Joined: May 2005
Posts: 128
usa
mrmopardan
OP
member
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OP
member
Joined: May 2005
Posts: 128
usa
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The trans. was gone threw about 7500 mi. ago. when the shift kit was installed. Just seems odd that it only slips under those conditions.
68 GTX Full street trim, solid lifter cammed. Best 11.34 @ 121 mph. 1.72 60 ft. (yeah I know.. my 60 ft. sucks)
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Re: Calling all 727 Trans. Guys..
[Re: mrmopardan]
#154398
11/21/08 11:20 AM
11/21/08 11:20 AM
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Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Quote:
The trans. was gone threw about 7500 mi. ago. when the shift kit was installed. Just seems odd that it only slips under those conditions.
I'm no expert but it seems that shifting manually at 5000+ rpms would be extreme. By extreme, I don't mean beyond the scope of its capability, but beyond "normal" mechanical performance(Not out of the ordinary for hp driving). If its going to slip, thats when it's going to slip; under extreme conditions. 
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Re: Calling all 727 Trans. Guys..
[Re: mrmopardan]
#154399
11/21/08 11:20 AM
11/21/08 11:20 AM
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Joined: Jan 2003
Posts: 75,008
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,008
U.S.S.A.
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Quote:
The trans. was gone threw about 7500 mi. ago. when the shift kit was installed. Just seems odd that it only slips under those conditions.
It's high load on the clutch pack and it not being able to hold the torque , it may have been slipping all along and it is just getting progressively worse that now you are able to notice it .
Who built it ? either way it's not going to get better on it's own .
What fluid are you using also ?
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Re: Calling all 727 Trans. Guys..
[Re: JohnRR]
#154401
11/21/08 11:41 AM
11/21/08 11:41 AM
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Joined: May 2005
Posts: 128
usa
mrmopardan
OP
member
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OP
member
Joined: May 2005
Posts: 128
usa
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A knowledgable friend of mine went threw the trans. several yrs. ago. I'm using type "F" fluid.
Looks like a good time this winter to drop it & do a rebuild.
68 GTX Full street trim, solid lifter cammed. Best 11.34 @ 121 mph. 1.72 60 ft. (yeah I know.. my 60 ft. sucks)
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Re: Calling all 727 Trans. Guys..
[Re: mrmopardan]
#154402
11/21/08 01:03 PM
11/21/08 01:03 PM
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Joined: Jan 2003
Posts: 75,008
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,008
U.S.S.A.
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Quote:
A knowledgable friend of mine went threw the trans. several yrs. ago. I'm using type "F" fluid.
Looks like a good time this winter to drop it & do a rebuild.
I agree , it's going to have to come out to fix it either way, once you overheat the clutches from slipping nothing is going to fix them other than replacement .
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Re: Calling all 727 Trans. Guys..
[Re: 383man]
#154404
11/22/08 01:07 AM
11/22/08 01:07 AM
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Joined: Jul 2005
Posts: 384
Australia
Mcode69
enthusiast
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enthusiast
Joined: Jul 2005
Posts: 384
Australia
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Quote:
There is only 2 clutch packs in a 727 and the front clutch pack is your problem. It is also applied in reverse but the pressuer is much higher in reverse so it may not slip yet in reverse. Since 3rd gear uses much less pressuer then reverse it will slip in 3rd gear before it will in reverse. Ron
The front clutch pak has a seal on the piston that can be tricky to get in sometimes, I've pulled them out and part of the seal has been folded back on itself, this may have caused your problem also because you are losing pressure there.
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