Re: 727 guru needed

[Jimmy Peavy <peaver63@xxxxxxxxxxxxxx>]

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I really can't remember .
That's why I asked for help within the group.
I wanted to say that there was a flat on the input shaft (maybe on the 
end?), and that it may have been slightly smaller.
The wiring may have come out of the valve body.Maybe a couple of wires.
I was shown the differences by a transmission rebuilder about 15 yrs ago.
There never was much interest by me, or anyone else to use the lock-ups, 
due to the non-availability of performance converters at the time.The 
Allpar site has some history of them but not much in comparisons of the 
two styles.
Below is an excerpt of their page on the subject:

I've really never seen too many pre-1978 Torqueflites "wear out" or 
break that haven't been either misused or neglected. Probably the only 
major trouble I can think of relates to the 1978 and later model year 
lock-up converter 904's and 727's. The torque converter had a piston and 
friction disc inside it that locked the turbine solid to the impeller 
front cover. This in effect eliminated any slippage in the converter and 
helped fuel efficiency. (The lock-up only happens after the 2-3 shift.) 
A few of the early complaints with the lock-up units were sluggish 
vehicle performance, pinging, bad cold weather performance, dying in 
reverse and most of all, vibration and surging after lock up. Diagnosis 
showed some units were locking too early and dragging the engine down 
(restricted cooler lines or worn oil pump drive gears sometimes caused 
the converter clutch to lock in reverse which killed the engine). The 
fix for premature lock-up was to install a different spring in the valve 
body to raise the lock-up speed. The pump clearances were also tightened 
to make sure ample fluid was available to keep the converter operating 
properly and prevent lock-up in the wrong gears. The lock-up 
Torqueflites probably caused more headaches for service technicians than 
any other previous units.


  Jimmy



Joeydahook9@xxxxxxx wrote:

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> Jimmy, I checked the 78 trans with the 66 and the input shafts are the  same. 
> There is no other electrical connection except for the neutral  switch.  I'm 
> wondering if they didn't use lock-up converters in the police  cars? Do you 
> know of a site where casting numbers can be checked?   Joe
>
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Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html. 


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