1947 Saratoga Posted October 14, 2022 Report Share Posted October 14, 2022 Hello, I have a 1947 Chrysler Saratoga 8-Cyl fluid drive. When in first gear at speed, letting off the fuel allows an auto-shift into "first-overdrive". However, traveling up inclined road, transmission slips in-and-out of gear. What might be the problem? A fluid drive transmission is such a myster box that I didn't want anybody to touch it during recent engine rebuild. The transmission has 69,000 original miles on it, with no service that I'm aware of. Thanks in advance. Bill Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted October 14, 2022 Report Share Posted October 14, 2022 Not much service to do on your M-5 "Hydraulically Operated" transmission. Just maybe drain and refill it with 10W oil. First off make sure the trans is full of 10W oil. Fill plug is half way up on the passenger side of the transmission. Not enough fluid...the trans will kick ot of the higher gear. May as well check that the fluid drive coupling is full too. You should read the shop manual on that or someone else can pipe in on that. If it's low it will not affect upshifts...it will cause engine speed flare-up and lathargic acceleration. A damaged or bare transmission circuit wire could cause this issue as well as the delicate governor silver points that get contaminated with trans oil weeping into the governor. Reading the factory shop manual is a must for working on your 47 Chrysler. The factory shop manual has it all on the 1946-48 Chrysler M-5 trans. The 1949-53 M-6 newer Chrysler transmission is different electrically. Mymopar.com has factory service films to assist on servicing the old mopars. 2 Quote Link to comment Share on other sites More sharing options...
1947 Saratoga Posted October 14, 2022 Author Report Share Posted October 14, 2022 Thanks very much for this information, I'll check the fluid level for sure, take care. Quote Link to comment Share on other sites More sharing options...
greg g Posted October 14, 2022 Report Share Posted October 14, 2022 Are you going to wide open throttle thus engaging the kickdown switch triggering a downshift? Quote Link to comment Share on other sites More sharing options...
1947 Saratoga Posted October 15, 2022 Author Report Share Posted October 15, 2022 Hello Gregg G, thanks for your inquiry, "no" I was not at full throttle or anywhere near it to have triggered a downshift, the transmission "came out of gear", then "bam" back in, and repeated one more time until I shifted to stop the possibility of that happening again, thanks. Bill Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted October 15, 2022 Report Share Posted October 15, 2022 Quote: When in first gear at speed, letting off the fuel allows an auto-shift into "first-overdrive". However, traveling up inclined road, transmission slips in-and-out of gear. Questions: Does this happen when you are in "Power" range? Starting off in first gear and having it upshift to second? How steep is this inclined road, that you would need first or second gear? Usually, we start off in "Drive" range (third gear) and let it upshift to fourth. The fluid coupling allows this stately acceleration. Some guys will start in first, but then shift to "power" range. Quote Link to comment Share on other sites More sharing options...
1947 Saratoga Posted October 16, 2022 Author Report Share Posted October 16, 2022 I rarely start off using the automatic function. Instead, I use the clutch, shift into 1st gear, and then as going up hill, let off fuel to shift into "first-overdrive", the hill was aggressive enough that I did not want to shift into "2nd gear proper", thanks. Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted October 16, 2022 Report Share Posted October 16, 2022 Just as a test, try starting off in the "Drive" mode, and see if it slips out of gear shifting from 3rd to 4th. (Give yourself [plenty of time to get up the hill.) Quote Link to comment Share on other sites More sharing options...
Tom Skinner Posted October 16, 2022 Report Share Posted October 16, 2022 There is a Selector Bushing in the Shift Linkage (along the Steering Column) just in front of the Fire Wall that probably needs adjusting. See Page 20 and 21 in: Transmision Fundamentals Service Book Chrysler Corporation Volumn 2 No.6. Dated 1949. If the Linkage gets between settings your problem exactly. I know I had it happen to my 1948 Chrysler going up hills here in NC. These Service Booklets are available to view in You Tube. Tom Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 16, 2022 Report Share Posted October 16, 2022 26 minutes ago, Tom Skinner said: Transmision Fundamentals Service Book Chrysler Corporation Volumn 2 No.6 Quote Link to comment Share on other sites More sharing options...
Tom Skinner Posted October 16, 2022 Report Share Posted October 16, 2022 At 10:42 it shows the adjustment Quote Link to comment Share on other sites More sharing options...
1947 Saratoga Posted October 17, 2022 Author Report Share Posted October 17, 2022 Hello Tom, Donald and Sniper, thanks very much for all this information (especially the "adjustment" to linkage as things were taken apart recently for engine rebuild), I shall certainly follow your advice, once i get it off jack stands as I noticed the rear wheel cylinder is leaking and if you can't stop there's no reason to "go". Thanks again, I keep you posted once the cylinder comes in and repair is complete, keep motoring. Bill 1 Quote Link to comment Share on other sites More sharing options...
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