8 1/4 strength

[gilberttitan08]

Hey guys, I was wondering if a 8 1/4 rear will handle a mild built 383, what mods will it require to handle such displacement?

 

[Roughbird72]

Hey guys, I was wondering if a 8 1/4 rear will handle a mild built 383, what mods will it require to handle such displacement?

how mild & how heavy of a car?

 

[383man]

I know some A-body guys are running 8-1/4 rears running 12's and they are holding up. But I dont know what they have done to the rear. Ron

 

[gilberttitan08]

Looking to get about 400 hp out of my 383, putting on an A body 68 cuda. Yeah, i figured they beefed it up.

 

[Roughbird72]

I think at 400 hp ish with a 727 & not too much converter, with a street tire it would probably be fine. That being said, the cost to "beef" up an 8 1/4 may be the same or more than finding a 8 3/4 for an A body.

Direct Connection's test car back in the day was a Duster with low compression 400, 727, 8 1/4 with a 4.30 gear & 9" slicks. they used this setup for testing the Purple Cams. They got this car into the high 11s

 

[rumblefish360]

Needing up the rear? Nothing really needs to get done at this HP level, though if you want peace of mind, a new sure drip and aftermarket high strength axles is all you'll need.