different between 8 and 9 inch

mustangrebuilder · July 28th, 2007, 12:31 AM

how can i tell if i have a 8 or 9 inch rear...thanks

HMUSN · July 28th, 2007, 12:34 AM

by the diff cover.

it should have a tag.

besides they look totally different.

http://www.moddedmustangs.com/forums...e-vt30582.html

mustangrebuilder · July 28th, 2007, 12:41 AM

thanks man....i dont have a drain plug so i have a 8 inch...that makes me pissed....

would a stock 8 inch held 550 horsepower

HMUSN · July 28th, 2007, 12:41 AM

I highly doubt it.

mustangrebuilder · July 28th, 2007, 12:45 AM

i really hope it can....

im building a 347 stroker and im putting all the money into the engine...

i guess i will just wait until it breaks...i will just not rip on it until i get a new rear end

HMUSN · July 28th, 2007, 12:52 AM

it doesn't cost much for a half decent rear end build.

I just replaced my entire rear end including install for 550.

if I would have upgraded to 33 spline it would have ran around a grand.

BWAL · July 28th, 2007, 12:53 AM

so you have 8 inches in your rear?

HMUSN · July 28th, 2007, 12:54 AM

^ do I need to quote you?

mustangrebuilder · July 28th, 2007, 12:55 AM

lol...yeah i do

BWAL · July 28th, 2007, 12:55 AM

Originally Posted by BWAL09

so you have 8 inches in your rear?

no thanks HMUSN. i just quoted myself on your behalf.

460brevill · July 28th, 2007, 02:23 PM

8 inch with 28 spline ,after market good axels and a track lok will hold it.i am doing it now with no problems.

TheUNZippee! · July 28th, 2007, 02:30 PM

Could be worse. You could have 9 inches in your rear.

MustangJoe65 · July 28th, 2007, 03:33 PM

An 8 wil not hold 500hp. it may last a while if you have zero traction. it is common for an 8 to fail around 300rwhp. if you launch the car hard with that 347 and on some good tires, i am certain it will fail and in a short period of time.

since the 8 and the 9 look very similar the easiest way to tell is that the 8 has an oval shaped housing and the 9 is round. some 9s have a bump in the rear of the housing for the ring gear some do not. some have a fill hole in the housing others do not.

mustangrebuilder · July 29th, 2007, 12:18 AM

yeah i dont have a 9 inch...like they said a 9 inch has a drain hole...and mine does not have one...and i have been looking at pictures.......

so long do you think it could last...

MustangJoe65 · July 29th, 2007, 09:10 AM

it could last the first time you take it out and dump the clutch at 2500rpm. or it could last a few years. who knows. if you have an automatic it will prolly last a bit longer. i've been lucky so far i only have an auburn pro 8 behind a procharged 302 thru a built C4. fortunately the 245/45 tires will just spin 1st thru 2nd. the thing is, the rear will hold up until you get some good traction then it will show you just how weak it is.

July 28th, 2007, 12:31 AM	#1
mustangrebuilder Enthusiast Join Date: Sep 2006 Posts: 992 iTrader: 0 reviews	different between 8 and 9 inch how can i tell if i have a 8 or 9 inch rear...thanks

July 28th, 2007, 12:34 AM	#2
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	by the diff cover. it should have a tag. besides they look totally different. http://www.moddedmustangs.com/forums...e-vt30582.html __________________

July 28th, 2007, 12:41 AM	#4
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	I highly doubt it. __________________

July 28th, 2007, 12:52 AM	#6
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	it doesn't cost much for a half decent rear end build. I just replaced my entire rear end including install for 550. if I would have upgraded to 33 spline it would have ran around a grand. __________________

July 28th, 2007, 12:54 AM	#8
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	^ do I need to quote you? __________________

July 28th, 2007, 12:45 AM	#5
mustangrebuilder Enthusiast Join Date: Sep 2006 Posts: 992 iTrader: 0 reviews	i really hope it can.... im building a 347 stroker and im putting all the money into the engine... i guess i will just wait until it breaks...i will just not rip on it until i get a new rear end

July 28th, 2007, 12:55 AM	#9
mustangrebuilder Enthusiast Join Date: Sep 2006 Posts: 992 iTrader: 0 reviews	lol...yeah i do

July 28th, 2007, 02:23 PM	#11
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	8 inch with 28 spline ,after market good axels and a track lok will hold it.i am doing it now with no problems. __________________ i sixing 200 six with 300 hp.

July 28th, 2007, 02:30 PM	#12
TheUNZippee! Moderator Join Date: Jan 2007 Location: Canada Posts: 61,816 Blog Entries: 1 iTrader: 0 reviews	Could be worse. You could have 9 inches in your rear. __________________

July 28th, 2007, 03:33 PM	#13
MustangJoe65 Newbie Join Date: Jul 2007 Location: the all american VALLEY in CT Posts: 11 iTrader: 0 reviews	An 8 wil not hold 500hp. it may last a while if you have zero traction. it is common for an 8 to fail around 300rwhp. if you launch the car hard with that 347 and on some good tires, i am certain it will fail and in a short period of time. since the 8 and the 9 look very similar the easiest way to tell is that the 8 has an oval shaped housing and the 9 is round. some 9s have a bump in the rear of the housing for the ring gear some do not. some have a fill hole in the housing others do not. __________________ 1965 Prochaged Caspian Blue / Platinum Grey Coupe 2005 Mineral Grey Mustang GT

July 29th, 2007, 12:18 AM	#14
mustangrebuilder Enthusiast Join Date: Sep 2006 Posts: 992 iTrader: 0 reviews	yeah i dont have a 9 inch...like they said a 9 inch has a drain hole...and mine does not have one...and i have been looking at pictures....... so long do you think it could last...

July 29th, 2007, 09:10 AM	#15
MustangJoe65 Newbie Join Date: Jul 2007 Location: the all american VALLEY in CT Posts: 11 iTrader: 0 reviews	it could last the first time you take it out and dump the clutch at 2500rpm. or it could last a few years. who knows. if you have an automatic it will prolly last a bit longer. i've been lucky so far i only have an auburn pro 8 behind a procharged 302 thru a built C4. fortunately the 245/45 tires will just spin 1st thru 2nd. the thing is, the rear will hold up until you get some good traction then it will show you just how weak it is. __________________ 1965 Prochaged Caspian Blue / Platinum Grey Coupe 2005 Mineral Grey Mustang GT

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