Rear axle/differential for 1939 Dodge pickup.

[BobT-47P15]

Hi.  Anyone here have a 1939 or 1940 Dodge pickup with original rear axle?   Just trying to determine what model axle is under my '47 Plymouth.

 

If you have such an axle, what are the numbers stamped on it.    Mine has:   663473--12  if that means anything to anyone.  Any info appreciated.

 

Thanks.     Bob 

[PT81Jan]

On 9/1/2019 at 3:32 PM, BobT-47P15 said:

Hi.  Anyone here have a 1939 or 1940 Dodge pickup with original rear axle?   Just trying to determine what model axle is under my '47 Plymouth.

 

If you have such an axle, what are the numbers stamped on it.    Mine has:   663473--12  if that means anything to anyone.  Any info appreciated.

 

Thanks.     Bob 

 

Hey Bob, I do not really have an answer for you, just a guess

 

Another forum member here was asking a similar question some time ago regarding his 1939 Plymouth Pickup.

His one has got the casting No. 663473-28

My 1939 PT has got the casting No. 663473-4

Both were originally equipped withe the 4.1 ratio gears, same axle dimensions.

 

1939 Dodge and Plymouth Trucks are practically the same. So I assume the axles are also pretty much the same.

Here my guess(es):

1. series =663473, changes marked by the separate No. after the dash (unlikely there happened so many changes in one year)

2. Chrysler had have different foundries / suppliers for one specific part, so to distinguish the axles the different No.`s after the dash. In case of quality issues a way to locate the source (unlikely there were so many suppliers)

3. Mix of 1. and 2. (more likely)

4. Different ratios in different pumpkins (most unlikely, as far as I know there were just 2 different ratios offered, 4.1 standard and 3.9 optional. Eventually also 3.74. Some mention the ratio is stamped onto the pumpkin. So a double indication (encoded via the No. after the dash) would not make sense). Btw, on mine I didn`t find a ration stamp.

5. ....?

 

[BobT-47P15]

Thanks PT81Jan.       Apparently the axle is about same size as original.....maybe geared a little lower than a normal

P15..….but it will run up to 70 mph when pressed.      Main reason I want to know is for replacing brakes and bearing seals. 

[DJ194950]

Bob just a little different info for you,

My interchange manual shows the rear end "housings"  are the same between dodge truck '39-47 1/2, 3/4t, Plymouth truck 39-41.

Many of the early Mopar car and truck 3rd. members (carrier assembly) are interchangeable to get different ratios.

 

Brake drum only no hub -Dodge truck 39-47  1/2 t-   Plymouth pass. car 37-48, Plymouth truck??

 

No info for  pre '41 Brake cylinders or anything else.

 

Sorry book does not have the seals etc.

 

DJ

[BobT-47P15]

Thanks for your input.  I found out about a place today in Kansas City, MO that relines brake shoes for about $15 each......think I will do that on the

shoes.        Now will look for  grease seals for the right rear axle.    That's why am trying to determine what year axle I have.  The car was in a accident many years before I bought it and the rear axle/differential was damaged and replaced.  There was nobody around to ask as I bought the car from a salvage dealer.   So I have been going by guesses made by

various people.

[DJ194950]

Look like you may have to be real lucky and have some manufacturer name and part numbers (getting more luck) on the parts after removal. ?️‍♂️

 

DJ