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1937 Diff Suggestions Needed


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I've never done anything with a differential and I'm looking for some suggestions on two things I want to do.

 

1. What is the simplest way to change the oil in the differential.  There's no drain plug just a fill plug so for those who have already done it, what's the best way to suck the heavy oil from the differential while it's still on the car?

 

2. Is there something I should know before removing the rear universal joint mount/base?  I know I'll have to lock the rear wheels from spinning in order to turn the nut.  You can see in the pix the old seal is leaking and needs replacing.  Is this a simple job to do?  I'll mark whatever I remove to put it back the way it was but beyond that, I'd appreciate any suggestions?

 

 

 

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Edited by kookie1 (see edit history)
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You need to mark the nut and pinion shaft so that when you put it back you do not get it too tight and change the preload on the bearing.  I have a NOS, genuine GM pinion seal @ $40 & $8.45 postage.  Kurt Kelsey 641-648-9086  Thanks!

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26 minutes ago, kookie1 said:

1. What is the simplest way to change the oil in the differential.  There's no drain plug just a fill plug so for those who have already done it, what's the best way to suck the heavy oil from the differential while it's still on the car?

 

You could use a suction gun, but that might sour you on the hobby forever. Maybe you can remove the bottom bolt of the pan and let it (really slowly) drain out the bolt hole. Works on 1936, not sure about 1937 (different rearend).

 

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On 6/3/2021 at 11:23 AM, kookie1 said:

I've never done anything with a differential and I'm looking for some suggestions on two things I want to do.

 

1. What is the simplest way to change the oil in the differential.  There's no drain plug just a fill plug so for those who have already done it, what's the best way to suck the heavy oil from the differential while it's still on the car?

 

2. Is there something I should know before removing the rear universal joint mount/base?  I know I'll have to lock the rear wheels from spinning in order to turn the nut.  You can see in the pix the old seal is leaking and needs replacing.  Is this a simple job to do?  I'll mark whatever I remove to put it back the way it was but beyond that, I'd appreciate any suggestions?

 

 

 

019.JPG

if you remove 2 or 3 very bottom bolts from the carrier, the old fluid will drain, pontiac used the same basic designed of the carrier from 1937 to 1956

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