Moparts Tech Archive

Automatic Trans.

727 Trans 4 Gear Planetary/Hemi Parts

Dennis
Moparts Member
Posts: 3948
From:Eagle Creek, OR U.S.A.
Registered: Nov 1999
posted 02-07-2001 11:40 PM
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The Hemi 727's had different front pumps, that were clearanced for the wider front drum(66-70), the high clutch drum was wider, the early Hemi 727's used a Spirolox ring to hold the high clutch retun spring retainer on. The kickdown band was wider, the 5.0 kickdown lever was only used with the Hemi 727's (Includes 440-6's), They used only 1 kickdown servo spring (inner), A different forward clutch drum, to clear the wider high clutch drum. 1967 and later ones used 4 pinion planetaries. The input shaft was marked for the heavy duty transmission. They used a high upshift speed governor weight package. They were supposed to have used a different 1-2 shift plug, and a different convertor with 7/16" bolts, and a higher stall speed. I am certain I am not remembering everything, buit that covers most of the basics.
As far as what had 4 pinion planet, there is a question that is difficult to answer right away, because they varied greatly between years. I will however do my best to answer that.
1967: hemi, and 440 HP's had them front and rear. Std 440's had them in front (All the way up to 1978 in fact!)
1968: 426 Hemi, and 383/335 & 440/375 (340 had front)
1969: 426 Hemi, and 383/335, 440/375 & 440/390 (340 had front)
1970: 426 Hemi, 440/375, & 440/390 (383/335 had only 4 pinion in front at this time. (340 had front, 340 T/A had front and rear)
1971: 426 Hemi, 440/375, & 440/390. (340 had front)383/Road Runner engine had only 4 pinion in front at this time.
1972: 440HP, & 440-6,big block trucks.F&R 400HP, and 340's had front only
1973: 440HP, & 440-6, big block trucks.F&R 400HP, and 340's had front only
1974: 440HP, & 440-6, big block trucks.F&R 400HP, and 360HP's had front only
1975: 440HP, & 440-6, big block trucks.F&R 400HP, and 360HP's had front only
1976: 440HP, & 440-6, big block trucks.F&R 400HP, and 360HP's had front only
1977: 440HP, & 440-6, big block trucks.F&R 400HP, and 360HP's had front only
1978: 440HP, & 440-6, big block trucks.F&R 400HP, and 360HP's had front only
Hopefully this helps.

727 4 pinion planetary ??

1Bad440
New Member
Posts: 80
From: Ohio
Registered: May 2002
posted 01-19-2003 09:30 AM

I found a small block trans. The guy said it was out of a 70 340 car. The valvebody and front pump and drum is out and it has a 4 pinion front planetary. Will the rear also be a 4 pinion?? If so what is it worth in pieces?

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John Russo
Moparts Member
Posts: 2257
From: Portsmouth, VA, USA
Registered: Nov 1999
posted 01-19-2003 12:09 PM

My '71 Duster 340 727 only had the 4 pinion front planet. The rear was a 3 pinion planet. Not much left in there, maybe a good 2 spring solid kickdown servo piston assembly and a 3.2 lever. John

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340Brett
New Member
Posts: 50
From: Sandpoint ID
Registered: Jan 2003
posted 01-19-2003 04:02 PM

My 70 727 has 4 pinion front and rear.
Is that not the way they came from the factory?

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440shorty
Moparts Member
Posts: 949
From: Annapolis, MD
Registered: Apr 2001
posted 01-19-2003 04:45 PM

I can't say much about the early 70s SB 727 transmissions, but the early 383 727s I have, as well as the 73 400 727, and all the late 727s have three pinion rear planets -- I guess the Chrysler engineers (or beancounters?) decided that four pinion rear planetaries are not really needed. On the other hand, FIVE pinion front planetaries are used in heavy duty (46RE and 47RE) late-model transmissions. Even in the 670 transaxles used in minivans have five-pinion front planetaries now.
Perhaps it is a load capacity issue (i.e. vehicle weight) rather than an engine torque issue that determines the number of pinions required for a given application.

Either way, no matter how incomplete the transmission is, if the case is good, get it and keep it. Cases can break or wear out where the low roller cam splines into the case.

440shorty

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