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12-01-2010, 07:37 AM
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What these GM# on rearend mean?
GM rearend with these numbers stamped on case? 3725899 J361 GM T
4 I want to put higher ratio in my 56 chev that now has 3:70 gears, but dont want to pay $275 and up. Any help apreciated. Thanks 
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12-01-2010, 10:20 AM
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The '55-'64 Chevy uses a 3 series differential for the 3.70 gear, so you should be able to install a 3.36 or 3.55 on the differential that you have now. The 4.10 uses a 4 series. These guys might be able to tell you what those numbers mean. http://www.trifive.com/forums/forumdisplay.php?f=52
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12-01-2010, 11:49 AM
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GM rearends
Your best bet would be to go for a chunk (if you have 56 housing) and get a 3.36 or 3.56 already set up, just pull the drive shaft, the axles and unbolt and re bolt (using a new gasket) These rearends were popular in the early 60's ( until 64) gl
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12-01-2010, 12:01 PM
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I have a possible chance at a 1957 rear end, "chunk" is that the word for front housing pinon and ring gears? "3rd member" ? Would my axles "56" fit in the 57 chunk without any change? Thanks for any info.
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