What robs more power?
Originally Posted by BlueSix
There's more to it than just what size rear...posi, spool, gear ratio...etc.
Ok so given the both have 35 spline axles, the same gear and a spool. Comparable axle sizes and such
9" will lose more. It's a hypoid type gear, engaging more teeth at once on the pinion. I've had a couple 9" rears, and they both lost nearly 30rwhp compared to a 10 bolt. The 12 bolt will usually lose like 12 to 15.
Originally Posted by mongse
I switched to a 9" and figured I'd make up the lost hp by going w/ bigger turbos. 
LOL I have the 12-bolt in there now and already wanna change it (havent even ran the car yet) With plans of close to 1000 HP on the gun I was tryin to save some carnage
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Originally Posted by Carbed4thGen
LOL I have the 12-bolt in there now and already wanna change it (havent even ran the car yet) With plans of close to 1000 HP on the gun I was tryin to save some carnage
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Why not a 9" housing and a 12 bolt center section??
Originally Posted by MADMAN
Why not a 9" housing and a 12 bolt center section??
Can u explain this cause I just got COMPLETELY confused. Wat part is each here? Maybe I'm just tired
Strange makes a center section that will fit a 9" housing but uses 12 bolt gears.
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Got a link to that madman?
What benifit is it though? I've thought he 12bolt was lighter, so whats the point of puting it in a heaver case? Whats the point of going with the center section, when the 9" holding point is more teeth touching the gear?
I've heard of a 12bolt with 9" bearings, but still unsure of what that really helps.
oh and didn't bigrick go 8s with 31 or 33 splines?
get 35+ spline/gun drilled for weight savings...
What benifit is it though? I've thought he 12bolt was lighter, so whats the point of puting it in a heaver case? Whats the point of going with the center section, when the 9" holding point is more teeth touching the gear?
I've heard of a 12bolt with 9" bearings, but still unsure of what that really helps.
oh and didn't bigrick go 8s with 31 or 33 splines?
get 35+ spline/gun drilled for weight savings...
The 12 bolt takes less hp to turn. I dont have a link but Stranges part number is a PRG500.
Big Rick has a 9" and I have been screaming at him to get bigger axles.
Big Rick has a 9" and I have been screaming at him to get bigger axles.
Originally Posted by MADMAN
Why not a 9" housing and a 12 bolt center section??
A friend of mine called Strange about that setup and it was not reccomended for an Fbod. Supposedly it's not as strong and is better for a very lightweight ride. Now.....this is what he was told. Do you know anyone that's actually running it? I had thought about that for mine at one time.
I wouldnt try it unless it was a N/A car. I was just giving options.
If you want a low drag 9" center section get the new Mark Williams unit.
If you want a low drag 9" center section get the new Mark Williams unit.
Originally Posted by MADMAN
I wouldnt try it unless it was a N/A car. I was just giving options.
If you want a low drag 9" center section get the new Mark Williams unit.
If you want a low drag 9" center section get the new Mark Williams unit.
Wat's the difference from a Mark Williams unit to say a Moser unit? and does Mark have a website?
This is the best **** for drag racing, but you better have the $$$ to back it up. He has quality stuff and unless you plan on being a pro drag racer ... 
http://markwilliams.com/
http://markwilliams.com/
with stock rear and gears i made 420/391 in 60deg weather in november, with my set up i got now is a moser 9in with spool 35 splin gun drilled axles and 4.11 gears. i made 404/381 in 107geg heat (hottest day here this summer) so in my opion 16hp not a big loss for me and i think it will be even less in cooler weather. and i got a rear im not skeerd of breaking any more
www.markwilliams.com
The Mar Williams is about $2000.00 higher but the benefits are killer as far as weight and drag.
The Mar Williams is about $2000.00 higher but the benefits are killer as far as weight and drag.
