83glx5.0

+1 my 83 glx was a v6 car. And as you can see in the pic... no quadshock mount.

projectresto83

I think I am gonna keep my 7.5 for awhile. I can get a trac loc unit with gears from the junk yard for $50 so thats cheaper than a 8.8 rear. I don't have enough power to break it anyway so why upgrade lol. Strength is the only reason to really upgrade anyway until you want to go 31 spline or other beefy options in the rear.

HACKGT350

i got a whole 8.8 for 50 bucks so you cant go wrong. that and my 7.5 is shot anyway so its gotta come out

killer91

yea its going into my gt turbo that im eventually going to be running around 30 lbs of boost on and the 7.5 wont survive the launches lol

Timspony

You can weld the mounting braket for the quad shocks on your car!

Hamutoff

ah sure yeah so lightness doesnt matter and rotating mass does not matter then install a 9" with 35 splines and you will get the same miliage because it wont make a difference, right?

I read fully loaded the difference is 80 lbs but dont forget about the rotating mass you DO know what the 7.5 in the 7.5 stands for, right?

Hamutoff

http://www.coolcats.net/tech/advanced/tcaxle.html

While it is Impossible to determine exact numbers..

8.8" supposed to be 3% more efficient than comparible 9"
7.5" supposed to be 4% more efficient than comparible 8.8"

vars include: angle, gear mesh, weight...

http://forum.miata.net/vb/showthread.php?t=274470

"...7.5 is ~4% more efficient than the 8.8; probably a function of size and mass of the gears. So if you really need that extra 2 to 4hp..."

http://www.allfordmustangs.com/forum...-swap-8-a.html

Gears are part of the picture but you are wrong if you think that the most extreme highway gear (like 2.73) would always net the best mpg... many have net better mpg using 3.27 or 3.55 ratios in mixed driving and even highway driving. Consider the amount of engine torque available working against a lever: compounded with final drive ratio (trans, axle), and must also work against wind resistance and friction.

projectresto83

But why do that? Most people remove their quad shocks anyway because after a good aftermarket suspension there isn't a need for them. I know I don't need them on my car and it has the stock old worn out suspension and I have no wheel hop problems, could be do to not having tires that even try to grab the pavement but I won't know or sure until I get a good set of tires.