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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> 1949 dodge b1b truck
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Topic Review (Newest First)
08-17-2012 06:45 AM

after looking up 48 Plymouth with some mod it will work with a 3.9 ratio it will help you will need to move the spring on the rear end to reset the angle
08-17-2012 06:42 AM

Axle Type Semifloating
Differential Hypoid
Differential Ratio 3.90
08-15-2012 08:04 PM
1949 B1B RearEnd

The ratio is 4.78 . Does a 1948 plymouth rear end fit? Plymouth is A body and the doge truck is B body. The measurements are off less than 1". Not sure about the ange of the bird perch?
08-13-2012 05:48 AM
more info

from the book could be 3.73,4.1,4.3,or4.78 to know look at diff. just under the fill on the passenger side bottom should be stamped in the diff hub
08-13-2012 05:36 AM
just starting a 49

here is a link to the site i use to get all the info you will need to work on that truck Pilot-house Truck Knowledge hope this helps
06-30-2012 11:57 PM
1949 dodge b1b truck

What is the size ratio in a 1949 Dodge B1B truck? Looks like a 8 3/4 but thety did not come out till the mid 50's.

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