Transmission oil for a 47 non synchronized 4 speed

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I have a 47 Dodge power wagon with a 4 speed non synchronized 4 speed trans the shop manual calls for a 80w/140 oil. I have been reading some have been using a synthetic 50w oil as a replacement. I believe being a non syncro trans that a yellow metal compatible oil is not a concern so is it possible to get better performance from a modern 50w than the 80w/140 ?
 
The Delvac 50 was the product I saw being used in place of the 80w90. Its pricey too.
 
Originally Posted By: Chris142
Sae 50 would be close to what it used when new.


visc.jpg


Wouldnt hit the 140 requirement though unless the API gear oil ranges have shifted with time.
 
Originally Posted By: JHZR2
visc.jpg


Wouldnt hit the 140 requirement though unless the API gear oil ranges have shifted with time.

Exactly.
An OEM xW140 of that era would've a KV@40*C range from 320 cSt to 748 cSt.
 
Originally Posted By: zeng
Originally Posted By: JHZR2
visc.jpg


Wouldnt hit the 140 requirement though unless the API gear oil ranges have shifted with time.

Exactly.
An OEM xW140 of that era would've a KV@40*C range from 320 cSt to 748 cSt.


So you are saying a 140 like this may work because the specs have changed over the years?

Edit: oops nevermind, I need more coffee
coffee2.gif
 
Last edited:
Originally Posted By: SOHCman
Originally Posted By: zeng
Originally Posted By: JHZR2
visc.jpg


Wouldnt hit the 140 requirement though unless the API gear oil ranges have shifted with time.

Exactly.
An OEM xW140 of that era would've a KV@40*C range from 320 cSt to 748 cSt.


So you are saying a 140 like this may work because the specs have changed over the years?

Edit: oops nevermind, I need more coffee
coffee2.gif


This StaLube ISO 460 gear oil fell under SAE xW140 of that era, and
It falls under modern day SAE xW140, therefore .....
absolutely yes , if OP wishes so.
13.gif
 
Originally Posted By: preaction
Does this being a straight cut gear transmission make any difference ?

Straight cut gears has less severe sliding action, vis-a-vis high off-set hypoid gears.
Hence ,no difference here.
 
Originally Posted By: zeng
Originally Posted By: preaction
Does this being a straight cut gear transmission make any difference ?

Straight cut gears has less severe sliding action, vis-a-vis high off-set hypoid gears.
Hence ,no difference here.
Easy application. Simple as it gets.
 
Originally Posted By: SOHCman


Edit: oops nevermind, I need more coffee
coffee2.gif




I was referring to the 80W90 Sta-Lube.
 
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