rear gear carrier

[Dale Uhrich]

does anyone know if the b1b and b1c rear gear sets are the same? I know the bolt patterns are different, is that all?

[Merle Coggins]

Differentials are the same in 1/2 and 3/4 ton trucks, and are also the same as Mopar cars of the same vintage. The brakes and drums are different though.

Merle

[Dale Uhrich]

Thank you i would rather part out my 3/4 ton than my spare b1b

[grey beard]

Hey Dale,

Are you looking for a taller rear ratio? I believe if memory serves that we both have the same size tires. I also still have the 4:10 rear, and it does get a little busy after sixty mph. Sure would like to try a 3:54 . . . . . .

[MBF]

I've got a 3:55 in my '78 half ton Dodge. She's starting to wind up pretty good at 65, but will cruise at 60 pretty comfortably. Not sure what the revs are, but its a slant 6 w a 1:1 3rd gear 3spd. Just my 2 cents.

[Dale Uhrich]

i located a chrysler rear gear 1949-1950 with 3.37 gears. I want to remove my spare 4.1 to combine the two so when i change i have one ready to install. also the will prove all fits before i tear mine apart.

[1937 Dodge]

Dale,

Please keep us posted on your 3.37 gear swap. I hope it is an easy swap. It was my understanding that the 3.37 third member from 49-59 may not fit our rear axles. That's why I am going with the 3.54 from a 48 Windsor. Are you going to swap out the ring and pinion instead of the whole third member? Watch the spline count.

Edited July 21, 2009 by 1937 Dodge

[grey beard]

Dale,

Like you, I also have a 4;11 now and wish for a taller gear. It is my thinking that to do that amount of work for a 3:73 would hardly make enough difference to bother. I am hoping to find a 3:54 or lower rear from a car.

AND, speaking of swapping lumps, if you found the axle splines were different, could you not just swap the axles along with the diffeferential. Seems like there would be no reason for it not working then.

At the Macungie show this weekend, I spoke with an older gent who has a 53 Pilothouse there at the show - nice truck. He said he has a 2:93 rear from a later model pickup with automatic. Never heare of this ratio, but he said he can cruise at 70 with no strain. He's driven his truck to Colorado Springs and to Texas, so I guess he knows what he's talking about. Must be nice . . .

[Young Ed]

Dave swapping the axles would work as long as they are the same length and have the same taper for the drums. More then likely your better idea is to swap the side gears to match your existing axles.