The 8 1/4 is the same size carrier as the 8 3/8's in 1,000's of pickups and vans. They are stout enough for most low level hot rodding. So is the 7 1/4 within reason.
My buddy cracked a spider gear on his 8 3/8's but he was stupid doing burn outs by backing up and slamming it into drive or around corners all the time. .
Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
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