Different 3900 case

[Elliot Garfinkel 166]

Hey guys have been doing 5025 rebuild, short story long, broke orig 3900 pto side case. Bought new complete case went to put bearings in and the orig broken takes 1528 the (new) case takes a.larger size bearing what size. The larger bearing is 1 1/4 the other 1 1/8 does that sound right

Can I just get larger bearing  and mix halves or do I start from scratch will the larger size effect the axle size thank you

[Elliot Garfinkel 166]

Here is the #s new case H3-2 3900n2

         My orig case  #s L15-1 3900n2

 Thanks again

[stevasaurus 23,274]

the H3-2  =  Augest 3 1962  casting date

the L15-1 =  November 15 1961  casting date

They skipped the letter I because it could be mistaken for 1.  3900 is the part number for the right side case half.

3900 is the right part number. The correct axle bearing should be #1528...that = a Torrington or Koyo B-1616.  That means the correct bearing for that case half measures 1 1/4" out side diameter...1" inside diameter...height is 1"  Motion INDUSTRIES catalog # 00090554.

Are you saying that the B-1616 bearing is not the right size for that case half??

[Elliot Garfinkel 166]

Here is the #s new case H3-2 3900n2

         My orig case  #s L15-1 3900n2

 Thanks again yes the one I just bought has a larger diam axel hole I think one is a heavy duty for a larger axel.i have the 1528 and it is to small.i will look for another case this time I'll know I need the smaller case. Thanks

[The Tuul Crib 7,339]

6 minutes ago, Elliot Garfinkel said:

Here is the #s new case H3-2 3900n2

         My orig case  #s L15-1 3900n2

 Thanks again yes the one I just bought has a larger diam axel hole I think one is a heavy duty for a larger axel.i have the 1528 and it is to small.i will look for another case this time I'll know I need the smaller case. Thanks

 I might have a couple of extra cases laying around if you need one .

pm me with what you need maybe a pic

[stevasaurus 23,274]

They did not make the Heavy Duty transmission until 1963 for the 953...and that part number is #6940 for the right hand case half...1 1/8" axles for the bevel gear differential.  Is it possible that the end of the axle tube is drilled out for a seal??  But then you would need an 1 1/8" seal.  I'm thinking the guy you got the case half from did some shenanigans.  Is he a member here??    In fact, I am sure you got stung by somebody who knew what they had and knew it was not going to work for you.  Look at the metal from your old one and what is left from your new one being drilled out.  I think I would be mad enough to pay that guy a visit...that really stinks what happened to you.  Take Tool Crib up on his offer...he is good people. 

[Elliot Garfinkel 166]

Sorry about slow response  but I think now that you mention it the axel opening is worn on one side it's tough when you clean the part ,paint the part and then their is something wrong with the  part I dont think it was intended but it won't happen again I'll ck everything now. Here is some pics. I am waiting for part from tool crib I appreciate him stepping up 

[The Tuul Crib 7,339]

5 hours ago, Elliot Garfinkel said:

Sorry about slow response  but I think now that you mention it the axel opening is worn on one side it's tough when you clean the part ,paint the part and then their is something wrong with the  part I dont think it was intended but it won't happen again I'll ck everything now. Here is some pics. I am waiting for part from tool crib I appreciate him stepping up 

 Elliot I should get this sent out to you this week I have been looking for that perfect Goldilocks box to put it in . 

[Elliot Garfinkel 166]

Thanks no worries I got plenty of things to do around here