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How to drain and refill my rear ('57 Panel)
#1413047 Tue Jun 08 2021 01:04 AM
Joined: Jan 2020
Posts: 473
P
'Bolter
I see a square plug on the rear differential, I'm guessing that's how I drain it. My questions are:

1. What oil type goes in it
2. Is there a fill cap on the top somewhere?

Thanks!


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413054 Tue Jun 08 2021 02:15 AM
Joined: Feb 2019
Posts: 2,075
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The plug your seeing is for filling. You drain it by loosening and prying open the bottom of the cover. Once drained, remover the cover, clean out the gunk on the bottom. Inspect or replace the gasket , then reinstall the cover.

Fill to the bottom of the fill hole. I use 90 weight multi-purpose gear lubricant. If you have a posi rear I believe you will also need some type of additive.


Phil

1952 Chevrolet 3100
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‘59 235 & hydraulic lifters
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Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413064 Tue Jun 08 2021 04:25 AM
Joined: May 2015
Posts: 4,165
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
You MAY be able to drain the differential by removing the lowest bolt from the cover. That works on a 47-55.1 1/2 ton. If that works, there's no need to mess with the cover gasket.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413077 Tue Jun 08 2021 11:34 AM
Joined: Jan 2020
Posts: 473
P
'Bolter
Thanks, guys!

Isn't there some letter/number combo on the differential to tell me if it's a posi? Or do I have to just jack the thing up? Dang Frankenstein projects grin


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413082 Tue Jun 08 2021 12:20 PM
Joined: Feb 2019
Posts: 2,075
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Originally Posted by pan3lman
Or do I have to just jack the thing up?
That would certainly be the easiest way to tell. If you can find some numbers on the rear, post them and I’m sure our collective will be able to tell you what you have.


Phil

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: How to drain and refill my rear ('57 Panel)
Phak1 #1413098 Tue Jun 08 2021 02:33 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Originally Posted by Phak1
That would certainly be the easiest way to tell. If you can find some numbers on the rear, post them and I’m sure our collective will be able to tell you what you have.

Will do- thanks!


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413111 Tue Jun 08 2021 03:51 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
I ran out and quickly checked the sides of the carrier, no numbers found yet but on the left (driver) side are 3 horizontal lines, and on the right (passenger) side are 3 vertical lines. I'm going to look at the base of it within the hour.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: How to drain and refill my rear ('57 Panel)
pan3lman #1413120 Tue Jun 08 2021 04:10 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Can't see the numbers. I'll have to wait until after work when I can get some grungies on.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869

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