Whos running over 700whp on an 8.75?
The downfall of an 8 3/4 is the housing flex. The flex causes the axles to crack the carrier caps. Most using the 8 3/4 use billet caps. I found a brace on the housing worked for me. 829 to the crank 742 carrier with a spool running 456 gears and a loose 5500 stall. Car weighed 3650 with no driver. Same rear in the car for many years.
The brace only went to the u-bolts. We will be cutting a early heavier truck housing to T-body width and running the braces to the axle flanges then put tubes through them for the u-bolts.
Our early Valiant also has a 8 3/4 same carrier and gears but runs a faceplated liberty Hemi 4spd. The car is getting a B1 big block But the car only weighs 2400 . We'll see what the rear takes with that. Both are leaf spring cars.
In all my years of hammering on 8 3/4's on the street I only ever broke 2 on holeshots. They were 741's with running tall tires in my manual trans 1971 power wagon and they broke the pinion clear off from spring wrap.
I never broke a 742 . The early big block block cars all had 8 3/4's I would take them to 3000 and higher then push the low gear button.
The downfall of an 8 3/4 is the housing flex. The flex causes the axles to crack the carrier caps. Most using the 8 3/4 use billet caps. I found a brace on the housing worked for me. 829 to the crank 742 carrier with a spool running 456 gears and a loose 5500 stall. Car weighed 3650 with no driver. Same rear in the car for many years.
The brace only went to the u-bolts. We will be cutting a early heavier truck housing to T-body width and running the braces to the axle flanges then put tubes through them for the u-bolts.
Our early Valiant also has a 8 3/4 same carrier and gears but runs a faceplated liberty Hemi 4spd. The car is getting a B1 big block But the car only weighs 2400 . We'll see what the rear takes with that. Both are leaf spring cars.
In all my years of hammering on 8 3/4's on the street I only ever broke 2 on holeshots. They were 741's with running tall tires in my manual trans 1971 power wagon and they broke the pinion clear off from spring wrap.
I never broke a 742 . The early big block block cars all had 8 3/4's I would take them to 3000 and higher then push the low gear button.