NEW Forum Group, SO-CAL Mopars

Jim Lusk said
The 7-1/4 will NOT hold up, long term, to a 340 or 360. An 8-3/4 is your best choice, but an 8-1/4 will work if that's all you can find or afford.

Yep, the 7 1/4 is not strong enough for a 340 or 360. :violent1:

I blew up 3 of them on 4 years behind a mild 318 with a 4 bbl, 340 cam, and dual exhaust. :violent2:

I went to an 8 3/4" sure grip and never had another axle problem... :blob: