Diffy ID and trailing arm question....

[Cat Fuzz]

K, I'm just curious what this rear end is. It's a monster, I know that.





Do I need to replace this trailing arm? The other side isn't like this.

[jostrans68]

ho52 h072 differential and I would replace that arm Good luck

[COBALT]

Yep, the legendary HO52. Probably with 4.10 gears. Since it's coil sprung you've got a 3/4 ton truck - I'm guessing '69?

Typical carrier with good-old one wheel wonder. If it's in good shape keep it that way, because once they go south basically plan on swapping in a Dana 60 or something. Keep it sealed tight with clean oil. The parts are no longer available with the exception of a new ring/pinion. I had mine rebuild and shouldn't have. Ended up with a good differential, but it was expensive. 3.90 gears + a detroit locker at the time, but now the locker isn't available for them any more either, so you'd be SOL...

[COBALT]

Oh, and your trailing arms have been abused as heck. You can find a good set of used ones and have them patched up at the local weld shop. Then coat them with something and throw in some new bushings and new U-bolts for the axle. That's what I did with mine and they look brand new. I don't think yours are salvageable though. You might be able to separate the reinforcement plate from the beam, and re-weld them together after cleaning, but it looks pretty rusted.