Re: Stock 727 planetary with transbrake?
[Re: 70Drop]
#2862045
12/19/20 07:03 AM
12/19/20 07:03 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,926
A shed in England
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If it were me, I'd do it now. "Peace of mind", "done before it takes out other stuff with it", "ready for more motor" etc etc.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Stock 727 planetary with transbrake?
[Re: Tig]
#2862059
12/19/20 09:17 AM
12/19/20 09:17 AM
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Joined: Mar 2006
Posts: 9,851 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,851
MI, usa
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If it strips it won’t take anything out. Probably not a bad idea to go steel carrier. We’ve stated to twist the splines out of them. Always caught during inspections. For sure you can put a lot of power thru the stock carrier on a foot brake leaving hard. 1.2x 60ft 3350-3550. Doug
Last edited by dvw; 12/19/20 09:19 AM.
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Re: Stock 727 planetary with transbrake?
[Re: dvw]
#2862065
12/19/20 10:03 AM
12/19/20 10:03 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,926
A shed in England
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If it strips it won’t take anything out. Probably not a bad idea to go steel carrier. We’ve stated to twist the splines out of them. Always caught during inspections. For sure you can put a lot of power thru the stock carrier on a foot brake leaving hard. 1.2x 60ft 3350-3550. Doug I had aluminium run through the 'box, cooler and lines after stripping one. It's just a PITA to clean out and my OCD had me freshen the 'box at the same.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Stock 727 planetary with transbrake?
[Re: racerx]
#2862068
12/19/20 10:13 AM
12/19/20 10:13 AM
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Joined: Dec 2007
Posts: 12,588 Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,588
Great Neck,LI,new york
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6 pin comes in the Cummins trans that fits the 727. They cost under $50. Years back I bought the A&A 4 pinion for $500 after wiping out the aluminum!
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Stock 727 planetary with transbrake?
[Re: dvw]
#2862077
12/19/20 10:46 AM
12/19/20 10:46 AM
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Joined: Sep 2007
Posts: 876 Arizona
PolyDart
super stock
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super stock
Joined: Sep 2007
Posts: 876
Arizona
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If it strips it won’t take anything out. Probably not a bad idea to go steel carrier. We’ve stated to twist the splines out of them. Always caught during inspections. For sure you can put a lot of power thru the stock carrier on a foot brake leaving hard. 1.2x 60ft 3350-3550. Doug I stripped one out shifting into 2nd and it was like missing a shift with a manual car. Engine instantly over revved. It may not hurt the tranny, but it could hurt the motor.
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Re: Stock 727 planetary with transbrake?
[Re: PolyDart]
#2862122
12/19/20 12:49 PM
12/19/20 12:49 PM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,877
Rio Linda, CA
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I stripped one out shifting into 2nd and it was like missing a shift with a manual car.
When starting out in 1st, brake or not, both planetaries are sharing the load. but. When shifted to 2nd, the front planetary absorbs the load, so that's the common failure mode.
The INTERNET, the MISinformation superhighway
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Re: Stock 727 planetary with transbrake?
[Re: John_Kunkel]
#2862400
12/20/20 01:10 AM
12/20/20 01:10 AM
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Joined: Jan 2005
Posts: 223 California
70Drop
OP
enthusiast
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OP
enthusiast
Joined: Jan 2005
Posts: 223
California
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I stripped one out shifting into 2nd and it was like missing a shift with a manual car.
When starting out in 1st, brake or not, both planetaries are sharing the load. but. When shifted to 2nd, the front planetary absorbs the load, so that's the common failure mode. Very interesting. Puts it into perspective. I've got probably 80 passes on the car, shifted into 2nd gear on every one of them, lol. I'll be sure to inspect carefully next time I take the trans apart, but I think I'll leave it for now
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Re: Stock 727 planetary with transbrake?
[Re: dvw]
#2862403
12/20/20 01:17 AM
12/20/20 01:17 AM
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Joined: Jan 2005
Posts: 223 California
70Drop
OP
enthusiast
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OP
enthusiast
Joined: Jan 2005
Posts: 223
California
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The Cummins planet is steel. But your output shaft has to have the correct spline angle to work. The amount of aluminum that came of the the ones we've hurt was gradual. Never saw much shrapnel. Over rev? A race car without a top end rpm limiter? Doug Do you know how I would check for the correct spline type for the Cummins planetary? I know there are early and late shafts, mine is the later (bigger) type.
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Re: Stock 727 planetary with transbrake?
[Re: 70Drop]
#2862882
12/21/20 10:54 AM
12/21/20 10:54 AM
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Joined: Dec 2007
Posts: 12,588 Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,588
Great Neck,LI,new york
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I am no expert by any means,,,,,,but I think the 66 to 71 spline is the same I wiped 2 aluminum sets foot braking off the line with 800 + HP @ 3900#
Last edited by hemi-itis; 12/21/20 10:55 AM.
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Stock 727 planetary with transbrake?
[Re: hemi-itis]
#2862954
12/21/20 02:25 PM
12/21/20 02:25 PM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,877
Rio Linda, CA
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The output shaft spline included angles are as follows:
'62-'75= 90°
'76-'93= 75°
'94-on= 60°
The INTERNET, the MISinformation superhighway
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Re: Stock 727 planetary with transbrake?
[Re: dvw]
#2863066
12/21/20 06:46 PM
12/21/20 06:46 PM
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Joined: Sep 2007
Posts: 876 Arizona
PolyDart
super stock
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super stock
Joined: Sep 2007
Posts: 876
Arizona
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Over rev? A race car without a top end rpm limiter? Doug It happened on the street, actually getting onto I-10 after a car show. The car has a limiter, but it still redlined with no load which never feels good.
Last edited by ab7fh; 12/21/20 06:47 PM.
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Re: Stock 727 planetary with transbrake?
[Re: PolyDart]
#2863188
12/22/20 12:53 AM
12/22/20 12:53 AM
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Joined: May 2003
Posts: 6,566 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,566
Downtown Roebuck Ont
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Over rev? A race car without a top end rpm limiter? Doug It happened on the street, actually getting onto I-10 after a car show. The car has a limiter, but it still redlined with no load which never feels good. It's called inertia. If the engine is under load at say 6500 and the load instantly goes away, the inertia of the crank and everything turning with it can accelerate it well past its redline, if only briefly. A rev limiter will have zero control of that. Kevin
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Re: Stock 727 planetary with transbrake?
[Re: Twostick]
#2863225
12/22/20 08:28 AM
12/22/20 08:28 AM
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Joined: Mar 2006
Posts: 9,851 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,851
MI, usa
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Over rev? A race car without a top end rpm limiter? Doug It happened on the street, actually getting onto I-10 after a car show. The car has a limiter, but it still redlined with no load which never feels good. It's called inertia. If the engine is under load at say 6500 and the load instantly goes away, the inertia of the crank and everything turning with it can accelerate it well past its redline, if only briefly. A rev limiter will have zero control of that. Kevin Zero control? So you don’t use one? Doug
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Re: Stock 727 planetary with transbrake?
[Re: dvw]
#2863314
12/22/20 12:35 PM
12/22/20 12:35 PM
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Joined: May 2003
Posts: 6,566 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,566
Downtown Roebuck Ont
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Over rev? A race car without a top end rpm limiter? Doug It happened on the street, actually getting onto I-10 after a car show. The car has a limiter, but it still redlined with no load which never feels good. It's called inertia. If the engine is under load at say 6500 and the load instantly goes away, the inertia of the crank and everything turning with it can accelerate it well past its redline, if only briefly. A rev limiter will have zero control of that. Kevin Zero control? So you don’t use one? Doug I don't currently have anything that requires one. My point is if you lose the overrunning clutch anywhere towards the top of the RPM range, inertia can accelerate the engine past its redline regardless of any rev limiter. Kevin
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