Re: IML: 727 torqueflite and stall speed
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Re: IML: 727 torqueflite and stall speed



 
Chrysler first offered the lock-up torque converter in 1978.  I owned a 1978 Monaco Btougham, 318-V8 4-bbl, with that transmission.  Never had a problem with it.  The lock-up gave the impression to many a passenger that the transmission was a 4-speed.  The lock-up was far more noticable than on my 1981 Imperial, but was still very smooth.
 
And it was offered with the B and RB engines.  The 1978 Chrysler Newport and New Yorker Brougham offered that transmission, and neither of those models came with a slant six or LA block engine.   Both series offered the 400-cid engine as standard and the 440 as optional equipment. 
 
Although Chrysler was the first of the big three to offer a lock-up torque converter, the idea is an old.one.  Packard's Ultramatic transmission introduced for 1949 had a lock-up torque converter, as did Studebaker's Automatric in 1950.  (Studebaker's transmission was built for them by the Detroit Gear Division of Borg-Warner, and after Studebaker dropped it for 1956, B-W shipped the tooling to the UK where the transmission was offered by such firms as Jaguar, Daimler, Humber, and British Ford (in their 6 cylinder models).   Packard's Ultramatic was dropped at the end of 1956 with the shift of production to the Studebaker plant in Siuth Bend.
 
And the idea was used before that on bus automatic transmissions. 
 
 
Bill
Vancouver, BC 
 
 
----- Original Message -----
Sent: Saturday, December 16, 2006 3:07 AM
Subject: IML: 727 torqueflite and stall speed

I used to have a 1978 Cordoba with the 400 BB and a lock-up torque converter (very noticeable when I had a broken motor mount).  I believe Chrysler was the first of the Big 3 to offer the lock-up torque converter, debuting in 1978.  
----- Original Message -----
Sent: Friday, December 15, 2006 1:56 PM
Subject: Re: IML: overdrive torqueflite and stall speed

cordova or magnum I think
----- Original Message -----
Sent: Friday, December 15, 2006 6:42 AM
Subject: Re: IML: overdrive torqueflite and stall speed

Thats interesting, what car used it? I can't find any referance to it. Dave
 
-------------- Original message --------------
From: "MIKE CINDY BECKER" <mikeandcindyb@xxxxxxx>
There were big block 400's that came with a lock-up converter at the end, probably hard to find now. mike becker
----- Original Message -----
Sent: Thursday, December 14, 2006 3:40 PM
Subject: Re: IML: overdrive torqueflite and stall speed

David, Thanks for the exchange, the lock-up converter was never offered for a B727 (Big block), as the big block ended in 78,(cars) there were some after that, for truck, and motor-home applications, but no lock-ups were used. The only way to get there is the 518, with modifications to fit a big block.
Its true, you would have to drive a lot to see the pay-back.One thing that could be done, if your looking for ALL small improvements, if your in the trans. for any reason see if a lower stall speed converter can be had. That could be worth 5-10% ,at high-way speeds,  especially if you have one thats 25 plus years old.I think the thoughts, the concerns, and the wishes, are great, but the fact is you have to accept the basic laws of physics, realize the limitations and ENJOY the moment!Ya'll have a nice day, Dave.
-------------- Original message --------------
From: David Whitney <hazegreen66@xxxxxxxxx>
Thanks for the clarification.  Yes, it is the converter that slips and not the trans.  That's what converters do by design, making automatic transmissions possible.
 
My point was not to recommend adding a lock-up converter to an older 727.  It was to recommend using the late model 727s for which a lock-up converter is available (78 and up,  but memory may be failing me) if you are going to do the GV thing or a tranny that comes with a lock-up converter if you are going to do the 518 thing.  As previously noted, no way are you going to be able to do this without some aftermarket parts and you will probably have to do some chassis modification in addition to shortening the drive shaft.
 
Considering the gas savings vs. the expense, over 6 or so years you'll recoup your money if you drive the bejesus out of your Imperial.  For a Sunday driver, there is no recouping and the satisfaction is in having it and showing it off.



Happy motoring,

David

'91 K-Imperial driver
'66 LeBaron dual air and every option known to man


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