The 9.5" - 14 bolt rear end is by no means weak. They are used right up to the 1 ton 4x4's. I drive a '88 K-3500 everyday with one. No problems at all.
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'71 K-20 350,SM 465 w/33s
'66 K-20 283,SM 420
'59 Willys CJ-5
'48 Chevy Half Ton SM 420
Akron, NY
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'48 1/2 ton 3100
'55 1 1/2 ton 4400
'59 Willy's CJ-5
'65 3/4 ton 4x4
'70 C-10
All drivers, no show trucks.
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