Transmission oil for a 1948 new yorker

[normanpitkin]

Is this suitable?

MILLERS OILS EP 80W90 GL4 MINERAL GEAR / GEARBOX / REAR AXLE OIL 

[Plymouthy Adams]

first...what is the transmission in Chrysler....is it is a clunk-o-matic....or a stock 3 speed gearbox connected to a fluid drive unit?  GL4 should not be used in a tranny due to the additives.....However GL4 is a hypoid oil for rear axles....I think GL5 would suit you better.   If you have a standard tranny and or tranny with an OD then GL1 is your animal

[normanpitkin]

hi ,my 48 rejoices in the fluid drive clunk o magic ,,am not sure if there were any new yorkers with a manual ! So therefore GL5 is ok? I am confused by some recommending 10W and some say *0 or 90W ,these seem completely different?

[DonaldSmith]

Be clear whether we are talking about the fluid coupling, which puts the "Fluid" in "Fluid Drive", or the gearbox.  Some Dodges had a standard 3-speed  transmission mated to the fluid coupling.  Use the clutch to start off, but you could drive around all day in third.  DeSotos and Chryslers had the four-speed semi-automatic, sometimes called the "Klunk-O-Matic". Use the clutch to start off, usually in the "Drive" range, and drive around without shifting.  The car starts off in a less-than-blistering 3rd and upshifts to 4th.  

The fluid converter takes a special hydraulic oil.  There are threads on this.  

The gearbox itself, if manual, would take the usual manual gearbox lubricant, SAE 80 or 90.  The four-speed semi-automatic transmission takes 10W engine oil. 

[_shel_ny]

15 minutes ago, DonaldSmith said:

Be clear whether we are talking about the fluid coupling, which puts the "Fluid" in "Fluid Drive", or the gearbox.  Some Dodges had a standard 3-speed  transmission mated to the fluid coupling.  Use the clutch to start off, but you could drive around all day in third.  DeSotos and Chryslers had the four-speed semi-automatic, sometimes called the "Klunk-O-Matic". Use the clutch to start off, usually in the "Drive" range, and drive around without shifting.  The car starts off in a less-than-blistering 3rd and upshifts to 4th.  

The fluid converter takes a special hydraulic oil.  There are threads on this.  

The gearbox itself, if manual, would take the usual manual gearbox lubricant, SAE 80 or 90.  The four-speed semi-automatic transmission takes 10W engine oil. 

Recent posts talk of a down shifting problem, solenoid, relay................

So what does Norm have????

[normanpitkin]

i have a fluid drive 4 speed ,I know very well the fluid drive fluid and have got a HUGE amount of it! What i do not have is the transmission oil  for the gearbox,which i surmise ought to be 10W oil BUT some sources recommend 80 or 90 ,hence my confusion.

[Plymouthy Adams]

GL5 is rear axle hypoid gear use only..............................

[Dodgeb4ya]

The Transmission in your NewYorker is "Hydraulically Operated" and uses only only 10W oil or equivalent.

If you were to use 80/90 it probably would take three or four minutes to drop oil pressure for auto down shifts!

[rb1949]

My 4 speed fluid drive has a metal tag on it indicating use 10W oil only. Easy drain/fill plugs via the access plate. 3 pints. Could only find a gallon at Tractor Supply. Same goes in the coupling, but I'm not going to drain/change that.

[normanpitkin]

thank you all ,10W it is! Now,to try and find some here in England.

[Plymouthy Adams]

possibily source an industrial sewing machine oil generally available in 5 and 10 weight