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Hey! Wanna watch a video on the history of Chrysler Auto Trans Fluid?


Art Bailey

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Thanks for the link.  At first I thought I'd seen this video made by Chrysler on the 41 Dodge.  But this is new.  It's 45 mins. long, but only about the first 9 or 10 mins. is on the Fluid Drive coupling with the M-3, M-5, and M-6 semi-auto transmissions.  I always thought that the 41-42 semi-auto trans. were called the M-4, but I was just guessing.  

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1941-1942 DeSoto/ Chrysler were the model M-4 transmission...

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He is very knowledgeable...but he missed the M-4 trans and FD coupling and also the later Fluid Torque Drive torque converter.

AFAIK there never was a M-3 coupling.

Cannot fault him at all....way too many versions of FD's and transmission combo's by mother MoPar.

Edited by Dodgeb4ya
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8 hours ago, MarcDeSoto said:

And thought this guy on the video was well informed.  I guess not.  I didn't know that the early Fluid Drives had a fill hole and a drain hole.  How would you know which was which?  And why would you need two anyway?  

This is guy is a guru when comes to modern transmissions. Even has a 4 hour video about the first automatic transmission, Hydra-Matic.

 

Upper hole is fill, lower is drain. You want to drain it completely.

 

M4 where vacuum operated unlike the M5/M6 hydraulic operated.

Functions exactly the same. M4 even had a cable to detach vacuum shifter for non-start towing.

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9 hours ago, MarcDeSoto said:

And thought this guy on the video was well informed.  I guess not.  I didn't know that the early Fluid Drives had a fill hole and a drain hole.  How would you know which was which?  And why would you need two anyway?  

He also mentioned how Mopar "did away" with the drain plugs altogether. I'm pretty sure I noticed plugs on my '48 when I was in there...

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8 hours ago, ratbailey said:

He also mentioned how Mopar "did away" with the drain plugs altogether. I'm pretty sure I noticed plugs on my '48 when I was in there...

Well they got rid of the drain plug.  He didn't say they got rid of the fill plug, which would also be used for draining when you turned the engine over until the fill plug was at the bottom.  That's how I drained mine.  

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Only one plug on 1946 and later couplings....a fill plug...

.....Except FTD converters..they do have the two plugs as they can be drained for service.

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