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Re: identify this differential
Rick Brown #1350713 Thu Mar 19 2020 08:18 PM
Joined: May 2005
Posts: 7,168
B
General Purpose
I would take bed off, as Kevin says, cut the coil off, cut the welds on the leaf off. Clean up the tube. Keep the leaf intact and find the proper ubolts and plates. Move shocks and mount per original, if they are not. Somebody was carrying real heavy loads back in the day and wanted to "beef" it up.


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: identify this differential
Rick Brown #1350716 Thu Mar 19 2020 08:53 PM
Joined: May 2015
Posts: 2,373
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Fortunately it appears they didn't weld on the spring leaves, just the axle housing. If they had welded on the spring leaves, I would consider them scrap. Useful only for knifemaking stock. Everything else can be salvaged. If they were carrying heavy loads, I would check the axle housing for straightness.
I had a '72 Chevy 1/2 ton that had been used to carry a monster slide-in camper and had a sagged axle. I had it straightened, but they got the center section out of line with the axle tubes, even though it was straight at the wheel ends. It had a limited slip in it and the binding of the side gears shucked the petals off of the friction plates and threw the bits into the pinion bearing. I wound up replacing the entire rear axle. Of course the guy I bought it from neglected to mention the damage. nono I happened to see him at a campsite a year or so later, and he looked incredulous that the truck was still on the road.


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: identify this differential
klhansen #1350729 Thu Mar 19 2020 10:22 PM
Joined: Aug 2019
Posts: 20
R
New Guy
Thanks Bartamos and Kevin your feedback is appreciated.

I will do as per your recommendations and as a preventative plan, I will take the entire differential into a local place that only does differentials and make sure everything is straight and in good order /rebuild before re- installing properly with new shocks / proper Ubolts and plates

Re: identify this differential
Rick Brown #1350730 Thu Mar 19 2020 10:33 PM
Joined: May 2005
Posts: 7,168
B
General Purpose
thumbs_up


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: identify this differential
Rick Brown #1350855 Fri Mar 20 2020 07:16 PM
Joined: Aug 2019
Posts: 20
R
New Guy
Finally was able to pull differential; cover last night.

Confirmed as a 3.90 gear ratio so with my T5 od transmission fifth gear at 0.76 my final is 2.96. I hope this will work as a daily driver but I will inquire with differential shop the cost of putting in a 3.73 and see if it would be worth it.

Attached Files
gear numbers.jpg (37.89 KB, 82 downloads)
Gears.jpg (48.93 KB, 82 downloads)
Last edited by Rick Brown; Fri Mar 20 2020 07:55 PM.
Re: identify this differential
Rick Brown #1350916 Sat Mar 21 2020 03:16 AM
Joined: Mar 2010
Posts: 9,228
5
Master Gabster
I would advise against changing from 3.90 to 3.73 with the .76 overdrive. I am assuming that you are running an inline six.
Your RPM will be too low in 5th gear until you hit 65-70 MPH.
It may sound quieter, but your gas mileage will actually suffer since your engine RPM will be below the optimal power band of this engine between 50-60 MPH. A vacuum gauge will verify this.

Re: identify this differential
52Carl #1351791 Thu Mar 26 2020 09:09 PM
Joined: Aug 2019
Posts: 20
R
New Guy
Thanks 52Carl. You are confirming what the fellow at the differential shop indicated that I am best to stay with the 3.90 which makes it easier anyways. Thanks for your input

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