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#4728206 - 04/15/18 07:52 PM Transmission oil for a 47 non synchronized 4 speed
preaction Offline


Registered: 05/14/15
Posts: 18
Loc: NJ
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 ?

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#4728216 - 04/15/18 07:56 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
jakewells Offline


Registered: 12/28/12
Posts: 373
Loc: Cave City KY
just use any modern 80w90 or 75w140 i personally wouldn't use a 50 weight oil in the transmission.
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#4728238 - 04/15/18 08:19 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
Chris142 Offline


Registered: 06/05/03
Posts: 16534
Loc: Deplorable in apple valley, ca
Sae 50 would be close to what it used when new.
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#4728278 - 04/15/18 08:51 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
mattwithcats Offline


Registered: 06/13/13
Posts: 1614
Loc: Virginia
Take a look ar Mobil 1 Delvac 50.

About 90 weight GL-4 gear oil...

https://www.mobil.com/English-US/Commerc...ission-Fluid-50
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#4728284 - 04/15/18 08:54 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
preaction Offline


Registered: 05/14/15
Posts: 18
Loc: NJ
The Delvac 50 was the product I saw being used in place of the 80w90. Its pricey too.

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#4728382 - 04/16/18 12:06 AM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
MolaKule Offline


Registered: 06/05/02
Posts: 18947
Loc: Iowegia - USA
This one of the rare cases in which I would recommend this for older transmissions:

http://www.crcindustries.com/products/api-gl-4-multi-purpose-gear-oil-1-gal-SL24239.html

I am not sure how your old seals would respond take to the seal conditioning of something such as Redline MT-90 or Amsoil MTG.
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#4728424 - 04/16/18 03:50 AM Re: Transmission oil for a 47 non synchronized 4 speed [Re: Chris142]
JHZR2 Offline



Registered: 12/14/02
Posts: 41456
Loc: New Jersey
Originally Posted By: Chris142
Sae 50 would be close to what it used when new.




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

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#4728428 - 04/16/18 04:14 AM Re: Transmission oil for a 47 non synchronized 4 speed [Re: JHZR2]
zeng Offline


Registered: 09/01/15
Posts: 2095
Loc: Malaysia
Originally Posted By: JHZR2


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 [email protected]*C range from 320 cSt to 748 cSt.

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#4728469 - 04/16/18 06:28 AM Re: Transmission oil for a 47 non synchronized 4 speed [Re: zeng]
SOHCman Offline


Registered: 03/29/10
Posts: 1281
Loc: USA
Originally Posted By: zeng
Originally Posted By: JHZR2


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 [email protected]*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 coffee


Edited by SOHCman (04/16/18 06:30 AM)
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#4728798 - 04/16/18 12:08 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: SOHCman]
preaction Offline


Registered: 05/14/15
Posts: 18
Loc: NJ
Does this being a straight cut gear transmission make any difference ?

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#4729181 - 04/16/18 06:54 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
preaction Offline


Registered: 05/14/15
Posts: 18
Loc: NJ
https://lucasoil.com/media/k2/galleries/369/10146_Syn50wtTrans_800x950.jpg This also was recommended but again its 50 weight.

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#4729194 - 04/16/18 07:03 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: SOHCman]
zeng Offline


Registered: 09/01/15
Posts: 2095
Loc: Malaysia
Originally Posted By: SOHCman
Originally Posted By: zeng
Originally Posted By: JHZR2


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 [email protected]*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 coffee

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. Coffee2

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#4729200 - 04/16/18 07:08 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
zeng Offline


Registered: 09/01/15
Posts: 2095
Loc: Malaysia
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.

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#4729880 - 04/17/18 12:47 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: zeng]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3227
Loc: Columbus,Nebraska
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.

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#4730268 - 04/17/18 06:33 PM Re: Transmission oil for a 47 non synchronized 4 speed [Re: preaction]
preaction Offline


Registered: 05/14/15
Posts: 18
Loc: NJ
Thanks for all of your responses.

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