Torque Converter

[nodak]

I have been reading alot in the archives about the pump in a 727 tranny. If I read right, the torque converter will only be fed fluid when the tranny is shifted to something other than park. So my question is: after installing a new torque converter should I have it in neutral for the initial startup? Any other tips on the final procedures following a tranny installation?

Thanks, Cris
Fargo, ND

[nograin]

Yup, I was one of those, and that is an excellent point. Answer is that it probably is fine either way.

Looking at the flow charts (from a '68 Plym TSM) the circuits used in Park and Neutral are the same. Main difference is that the pressure in the cooler and torque converter circuit is only 5-30psi at P, and 35-50 psi in Neutral.

So, the pump is pumping in either case, and if there is no load on the tranny/tc then the fluid will not be in danger of overheating.



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360 auto select
body by beer (PO)
carries wood inside
no "wood" outside

[archiele]

A tranny mechanic friend told me that if you want a good durable mopar tranny, then get the 727 out of about 78-79(?) cars ( they are unique, and parts are different numbers) but he tald me that the were made with bigger pumps and bigger oil passages. He said that the only ones from those years in his shop had been run out of oil.

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Currently a 1965 Wagoneer
bone stock.
also have an '88 Zuki

[nograin]

Hmm thats interesting. Will have to ask a friendly counter parts man if that can be confirmed. There were some slight differences year to year, and some shift kit makers like Turbo-action reflect that in their product line.

My impression has always been that the late 70s Mopar 727s were kind of sloppy in their shifting. A late 60s or early 70s unit was better for racing. I doubt thats applicable to the FSJ 727s, as they came in later and looks to have a different tail for the Xfer case, and obviously require those smooth shifts the 727 is known for. There was a major change back in 65 or 66 when they stopped using a rear pump. Had one of those out of a 65 cuda. Could get the linkage to work on the 67, gave up and dropped it back out, traded for the 78 rebuild. Drats, wanted to be able to push start the car, and the rear pump makes that possible.

[This message has been edited by nograin (edited January 20, 2001).]