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Re: 3.55 gear set install and shim selection
posey #1334275 Mon Nov 18 2019 11:19 PM
Joined: May 2015
Posts: 2,364
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
I got you confused with another member who had the pinion bearings go and the pinion contact the differential carrier. Yours isn't as bad as his, but still, I'd be a bit concerned with that much metal running around inside the pumpkin.
Check out the damage on his carrier. Crunched differential


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: 3.55 gear set install and shim selection
posey #1334303 Tue Nov 19 2019 03:02 AM
Joined: Jan 2013
Posts: 1,642
S
Shop Shark
Kevin, the carrier was an extra that I sent him, it had some marks on it but checked out ok.


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 3.55 gear set install and shim selection
posey #1334327 Tue Nov 19 2019 01:24 PM
Joined: Jun 2017
Posts: 129
P
posey Offline OP
Shop Shark
I think every diff carrier I have ever seen illustrating a repair or replace article had some form of marks on them including the old one I removed from
my truck in no worse condition that the one I show in the picture. It had lots of backlash and run-out but not blown-out.

This Diff has all new bearing sets for the entire rear end, NOS Hyatt and NOS New Departure on the pinion and NOS GMC on the carrier.

Looking forward to the day I get to take it out for the first run.

Re: 3.55 gear set install and shim selection
posey #1334382 Tue Nov 19 2019 11:12 PM
Joined: May 2015
Posts: 2,364
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
All I know is that the engineers didn't design them so the pinion hits the differential carrier.
Something has gone wrong on those that are marked up to reduce the clearance between the pinion and carrier. Wear in the pinion bearings, which would increase backlash as well as axial movement of the pinion, could easily account for the interference markings. That metal that used to be on the carrier had to go somewhere, and would increase the wear rate of everything.
If yours was checked out and cleared for use, then that's good.


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: 3.55 gear set install and shim selection
posey #1334385 Tue Nov 19 2019 11:20 PM
Joined: Feb 2004
Posts: 20,344
H
Boltergeist
The most common cause of that damage to a carrier is a badly worn or destroyed front pinion bearing. When the driver lets off the throttle, the pinion gear gets sucked back against the carrier. I've also seen a loose pinion nut cause the same sort of problem.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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