RV 727 Torque Conv Stall Speed?

[BPBP440]

Does any one know if a 78 440/727 in an RV had a higher designed stall than a pass car application? Posting my RV trans to Craigslist and trying to decide if I should hold onto the convertor.

 

[Greg Ducato]

If it is a 12 inch converter, narrow ring gear, it will be a very low stall, if it is an 11 inch converter with wide ring gear it will still be a low stall but probably in the vicinity of 1600-1800 depending on the application. It will be weighted for a cast crank engine so be careful what you might swap that into.

 

[mopar 3 B]

Considering my motorhome weighs over 10000 lbs. sometimes 2400 rpm will not move it. And I do not have my foot on the brakes eathier but not many car weigh that.

 

[BPBP440]

Considering my motorhome weighs over 10000 lbs. sometimes 2400 rpm will not move it. And I do not have my foot on the brakes eathier but not many car weigh that.

For sure. That's exactly why I wondered if they were a higher stall, since you would need to get up in rpm a bit to move the big thing. But I suppose Chrysler could just count on the stall being higher on a stock convertor simply by virtue of the large mass it is moving.

 

[Greg Ducato]

For sure. That's exactly why I wondered if they were a higher stall, since you would need to get up in rpm a bit to move the big thing. But I suppose Chrysler could just count on the stall being higher on a stock convertor simply by virtue of the large mass it is moving.

That is correct, the more weight the higher the stall speed to move it

 

[Longroof]

First measure the diameter. If I remember correctly the hi stall units were about 10 3/4". I would bet it is not a hi stall unit. The factory hi stall units can be bought cheap enough I would just keep yours for a core if nothing else when you buy a new hi stall converter.