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Joined: Aug 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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some where I saw a blog on ID chev rear end housings to tell if 4:22 or 3:73 ,now I can't find the blog,anyone out there know ?? .Spencer
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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No prefix number or B is a 4.22
Prefix C or CB is a 3.73
Gene Schneider
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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Great thats what I was looking for ,,I found a guy that has a couple of chev diffs but he does not know what they are ,now maybe we can figure it out ..spencer..
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The 1937 and 1939 will work but will have different pre fix letters.
Gene Schneider
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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Are the ID on top of carrier just forward of punkin? what would 37 or 39 prefix be,be nice to know what to look for ..S
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The numbers are stamped into the housing to the right side of the differential carrier above the center rib ....kind of just behind were the torque tube enter the housing
The info from Chevrolet that I have says CB for the 3.73 made in Tonwonda and C if made a the Detroit plant.
For 1937 it lists just C for 3.73 and no marking for 4.22
Last edited by Chev Nut; 09/26/16 02:20 PM.
Gene Schneider
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Joined: Jul 2005
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ChatMaster - 3,000
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If still in doubt , remove the back cover and count the number of teeth on the ring gear or find the teeth number that is stamped in the ring gear circumference.
JACK
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Joined: Aug 2016
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Shade Tree Mechanic
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Shade Tree Mechanic
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Found a diff. in nortern Calif, guy says number on top is Ci53i830 does that sound like a 38 3:73 diff. ? SC
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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It could be a 1937-1938 or 1939 which are all the same and from a Master model....and a 3.73
The actual year the gears were made will be stamped into the ring ggear and pinion gear.
The torque tube and center carrier will be fine but do not use the banjo housing if from other than a 1938.
Gene Schneider
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