M37 diff (with 4:89) in my wc12 1/2 ton (REAR )

Posted by DDD [172.70.206.147] on Monday, November 07, 2022 at 08:56:07 :

I actually did this swap years ago, but forgot about a few minor details.
Using a rebuilt, M37 unit with 4:89 gears. Using take out 3/4 ton axle shafts in the housing.

My question to anyone who did this swap and remembers this detail:

Did you have to cut down the length of the “AXLE” shafts?
Or did you make up the difference with a spacer?

It would appear I have to, as sliding the stronger 3/4 ton axle shafts into the housing, I’ve got quite a gap between axle shaft hub inner surface and the housings hub

Wouldn’t cutting down the length, ultimately loosing part of the spline length, loose strength?
Cutting using a grinding wheel; wouldn’t it loose the axle shafts temper or hardness?

Follow Ups:

• Re: M37 diff (with 4:89) in my wc12 1/2 ton (REAR ) - Vaughn 08:58:25 11/08/2022
  • Yes⦠3gaskets - DDD 10:21:05 11/08/2022
    • Re: Yes⦠3gaskets - Vaughn 11:40:12 11/08/2022
      • M37 diff.. latest LARGE Diff - DDD 09:15:03 11/09/2022
        • Re: M37 diff.. latest LARGE Diff - Vaughn 11:47:01 11/09/2022
        • My only regret.. - DDD 09:26:42 11/09/2022
          • Re: My only regret.. - Vaughn 11:48:59 11/09/2022
• 1/2â removed!! - DDD 20:20:10 11/07/2022
• Re: M37 diff (with 4:89) in my wc12 1/2 ton (REAR ) - Dozerman51 11:08:14 11/07/2022
  • Re: M37 diff (with 4:89) in my wc12 1/2 ton (REAR ) - Dozerman51 11:09:52 11/07/2022
    • Thatâs what I was looking for - DDD 11:37:02 11/07/2022
      • Sorry 1/4 inch - DDD 11:41:35 11/07/2022
        • Cutting axles - - dry in BC Bruce 14:44:52 11/07/2022
• Re: M37 diff (with 4:89) in my wc12 1/2 ton (REAR ) - DDD 08:59:28 11/07/2022

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