gregchrysler Posted June 13, 2019 Share Posted June 13, 2019 Greetings friend==can a bad sprag cause no reverse? I have a 1949 Chrysler Royal Woodie 251 ci fluidmartic m6 transmission first and high gear work fine Link to comment Share on other sites More sharing options...
Rusty_OToole Posted June 18, 2019 Share Posted June 18, 2019 More likely a linkage adjustment. I don't think they have a sprag. The M6 is more like a manual trans with a hydraulic self shifter. Link to comment Share on other sites More sharing options...
Spinneyhill Posted June 19, 2019 Share Posted June 19, 2019 (edited) What do you mean by a "sprag"? ......looking up "sprag"...... Are you thinking of a "sprag clutch" arrangement, which I suppose is the term now used for the freewheeling part of the O/D boxes in the '30s? If there were one, selecting reverse needs to disengage it somehow. In the pre-war OD, it was a rod that pushed a sleeve over the "sprag clutch" to lock it. Edited June 19, 2019 by Spinneyhill (see edit history) Link to comment Share on other sites More sharing options...
Spinneyhill Posted June 19, 2019 Share Posted June 19, 2019 Is this the gearbox known as Prestomatic Fluid Drive in Chrysler, Tip Toe Shift on De Soto and Gyromatic Drive on Dodge? Basically an overdrive box with no first gear, operated hydraulically? I can copy the pages in MoToR's Manual 1950 if that will help. There is a bit on Diagnosis and Tests and on Electrical Tests. Quite a few pages. I am a bit confused (in not knowing what you are talking about plus what MoToR is talking about). They talk about 1946-50 (C & DS) and 1949-50 Dodge as above, then sort if imperceptibly slide into calling it the 1949-50 "automatic" transmission and then further on it becomes the 1946-50 automatic transmission. Reading on, Fig. 80 shows a freewheeling unit with rollers. So it looks like there is a "sprag clutch" in there on the countershaft. So the question is, how is that locked to select reverse? It says the "free-wheeling rollers cannot engage when the direct-speed clutch sleeve is moved forward or engaged with the main drive gear". I think Rusty is right: adjustment might help. Use 10W engine oil (not SAE 10 but SAE 10W) all year round. Link to comment Share on other sites More sharing options...
gregchrysler Posted June 20, 2019 Author Share Posted June 20, 2019 Thank s spinney 1949 Chrysler royal Woodie 6 cyl fluidmatic - sprag clutch has spring and roller? used for reverse? I think it is a m6 tranny thanks again need diagrams and diagnostics Link to comment Share on other sites More sharing options...
Rusty_OToole Posted June 20, 2019 Share Posted June 20, 2019 I was thinking of parking sprag, that locks the trans in Park. The M6 trans doesn't have a sprag or a park position, it has a hand brake on the back. If you mean sprag clutch or freewheel there are two, one in the Fluid Drive and one in the transmission but they seldom give trouble, and have nothing to do with shifting into reverse. If he is lucky it is a simple linkage adjustment. Link to comment Share on other sites More sharing options...
Spinneyhill Posted June 20, 2019 Share Posted June 20, 2019 Here are the pages on testing. Sorry for the rough scanning: next time it will be photographed. Link to comment Share on other sites More sharing options...
Spinneyhill Posted June 20, 2019 Share Posted June 20, 2019 Link to comment Share on other sites More sharing options...
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