I currently have a 8.2" 10bolt and have a 9" basically ready to put in, but am wondering how much, if any i will have to shorten my driveshaft. I hope i dont have to at all, because i would like to replace it later, when money allows me. Any help would be appreciated.


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67 Camaro
383-SRP Pistons, Manley Rods, Cola Crank, Edelbrock Performer RPM package, Speed Demon 750 dp, MSD Ignition, CalTracs Traction Bars

There are about a dozen yokes for the 9" Ford. Depending on which one you have you may not have to do anything to your drive shaft, then you might have to get a longer one. You will not have to have it shortened.

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'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

Mine required a longer driveshaft.

Jody

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MY CAMARO (http://www.camcojb.com)

bgh, do you know which yokes require shortening or lengthening??? i have a 70 bronco 9 inch that is about perfect width for my 68 camaro, maybe a tad shorter which i can fix with spacers or back space. anyway, probaly will have to measure once i have it installed to check length, Is the 70 bronco rear a good choice to install with out shortening or anything?? thanks
Jake

Was anyone aware that it takes more horsepower to turn a 9" rearend?
jamie

That's why Jody went to a 540 & Blower. LOL http://www.camaros.net/forum/biggrin.gif
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Rick

I was going to measure the yokes today and I forgot. Basically there are 3 types of yokes for the 9". There is a long yoke, a short yoke and a flange yoke for the CV joints. There is also a different yoke for the Daytona pinion housing, but you will probably not need to worry about that one. You will only be concerned with the long and short yokes. These two types take several different sizes of u-joints, but if you can get the long yoke for the 1310 u-joint you will not have to do anything to your drive shaft.

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'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

<BLOCKQUOTE>quote:</font><HR>Originally posted by 69lemans:
Was anyone aware that it takes more horsepower to turn a 9" rearend?
jamie<HR></BLOCKQUOTE>

How much more?

In the neighborhood of 25. This I was told by a speed shop that races two cars, a camaro and a vette.
jamie

Yes, the 9" takes more power than a 12 bolt, but its not 25hp, maybe like 1-2% more,(9hp if you have 450hp) and you wont feel the difference. Its basically the difference between running a TH350 and a TH400. The 400 is stronger but takes more power to turn. I was aware of this when i bought the 9 inch. You are aware it takes more power to turn an automatic over a stick right? Well, most drag racers run automatics too, because the benefits out weigh the cons.

25 horsepower? At 746 watts per horsepower, that's roughly 18,650 watts dissipated in the rear end. If this was a plug-in wall heater, it would draw 170 amps at 110 volts. I wonder how long it would take to boil 2 quarts of gear lube? My microwave will boil a cup of water in about a minute with only 600 watts.

at 18,650 watts, you would definately have to use 240 volts single phase, at 77 amps. or better yet, if you used 480 volts, three phase, it would draw just under 23 amps,(thats assuming a 100% power factor), which would be much easier to find a breaker for. oh, that is if you have three phase power available, if not, then you could just get a phase adder http://www.camaros.net/forum/biggrin.gif



[This message has been edited by 68rs406 (edited 11-24-2002).]