Max rearend torque
Thread Starter
Pro
Joined: Mar 2017
Posts: 569
Likes: 40
From: Durham NC
Max rearend torque
How much Big Block hp/torque will a stock rear take before bad things happen?
And what mods would be needed(if any)for it to last with around 550 lb. torque, 411 gear?
Thanks!
And what mods would be needed(if any)for it to last with around 550 lb. torque, 411 gear?
Thanks!
Le Mans Master
Joined: Apr 2001
Posts: 9,556
Likes: 288
From: Granbury Texas
With street tires, 427 Hotrod runs about a million pounds of torque, BUT with slicks, even one "dead hook" will probably lunch your differential.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
My 69 was a 427/435 L89 car new, then got an L-88, then an LS-7. Now it's a 496/???. It's never in it's life had an off the line drag strip style "launch". Still has the original 4.11 rear and the factory installed u-joints. Around 40k miles. I suspect one real launch and I'd need oil dry, a dust pan, and a broom.
Instructor
Joined: Mar 2015
Posts: 151
Likes: 12
From: Burleson Texas
I have heard that with decent street tires it is good for about 550 torgue. You will want ARP Bolts hardend ring and pinion, hardend axel shafts. And a new posi unit with carbon fiber on the clutch plates. If you going to use slicks or hit 600 ft/lbs of torwue. But then what do I know. Ast Tom he knows more about these diffs than anyone else.
Niiice $$
