7.5 rear how strong are they?

mtw002 · October 31st, 2008, 07:00 PM

Ok well i just bought this 81 coupe. It has the stocker rear end/gears in it...Should i just change the gears to 4:10's or just swap out the whole 7.5 for a 8.8 or 9 incher? I'm not sure how much abuse the 7.5 can handle Its my first Fox.

stangfreak · October 31st, 2008, 07:09 PM

i'd swap for an 8.8 if it were me

mtw002 · October 31st, 2008, 07:13 PM

Thats what i was thinking about doing. My dad has an extra one setting at his house...The engine is a built 302 bored .30 over nothing crazy...has a healthy cam in it. It i'll be street and drag. I know i'll be ragging on it hard.

vfast · October 31st, 2008, 07:30 PM

it will be ok....handle 400 hp with no problem

grnstang · October 31st, 2008, 11:40 PM

just swap the 8.8 so the possibilities are endless ;D

mtw002 · November 1st, 2008, 01:20 AM

cool thanks peeps...just getting the gears now...

vfast · November 1st, 2008, 09:37 AM

why waste the time of an 8.8 swap unless it's a 5 lug/disc conversion

Racinjason81 · November 1st, 2008, 01:24 PM

the 7.5 is very weak at least get a 8.8 for something reliable

1bad331 · November 1st, 2008, 01:50 PM

if your dad has the 7.5 use it, i put a free one in my car why i rebuilt my 8.8 it stayed for a year and the car ran12.8 on the slicks with a 6000rpm dump for two full days of racing i was kinda wanting to blow it apart but it held, this motor i had on it put 385rw ftlbs on the dyno

mtw002 · November 1st, 2008, 02:15 PM

Yeah he said we could swap the 8.8 in it if i wanted...But i think i'll stick with the 7.5 till it goes caaa.....clunk.....

http://i66.photobucket.com/albums/h2...393171381a.jpg
http://i66.photobucket.com/albums/h2...783ba6d51e.jpg
http://i66.photobucket.com/albums/h2...969a86aa15.jpg
http://i66.photobucket.com/albums/h2...ba76e2e61f.jpg

Pics of the 81 coupe

TurboLX · November 2nd, 2008, 10:19 AM

7.5 will not hold much more then 300ft lbs of tq.

i blew 2 apart of them apart when i was running 7.5s in my 2.3 turbo Mustang like 2 years ago, there not very strong.

ujslost · November 2nd, 2008, 01:03 PM

if you have an 8.8 use it. but i personally think the 7.5 is stronger than it gets credit for. But most are tracloc. unless someone put a ranger pumpkin in it

superbean · November 2nd, 2008, 02:29 PM

Use the 7.5 for now

Build the 8.8 for when the 4 banger rear blows up

jessemachone · November 2nd, 2008, 02:37 PM

Originally Posted by superbean

Use the 7.5 for now

Build the 8.8 for when the 4 banger rear blows up

+1

M L Struck · November 3rd, 2008, 07:42 AM

If you keep the slicks off of it will last, I ran 12.70s in my 85 GT until it blew up and it was just the spider gears so replaced them with junkyard parts and finished the season and then put in a 9" all problems gone now.

stangfreak · November 3rd, 2008, 09:23 AM

Originally Posted by vfast

why waste the time of an 8.8 swap unless it's a 5 lug/disc conversion

because if it's not a pre '86 GT 7.5 or an SVO 7.5 it's most likely not a posi trac. why waste the money putting a posi differential and gears in a 7.5?

ryans88gt · November 3rd, 2008, 12:06 PM

They will handle 400 hp and about 200 ftlbs of torque...lol

One good launch with sticky tires and a stock 5.0 and see ya later

mtw002 · November 3rd, 2008, 01:32 PM

Well the car is a 81 4cyl coupe converted to 5.0. Stock rear end, stock gears...I'll just throw some gears in it and slicks. If it blows it blows. Also a 5.0 bored .30 over is a 306 right?

orangeRcode · November 3rd, 2008, 01:45 PM

The 7.5s are stronger than you think. It also depends on what tranny/power adder you are running. I have a buddy with a 4 cylinder coupe converted to a 5.0. He is currently running a c4 and turbo making ~450 rwhp and the rear is still going after 2 seasons on slicks. It amazes me every time he launches it and it doesnt generade.

:

86_Notch · November 3rd, 2008, 06:52 PM

strong enough to live behind an auto equipped ranger running low 11s on slicks

don't waste your money on gears for the 7.5 tho, you can get 8.8s pretty cheap and you're better off saving your money for gears for it instead

October 31st, 2008, 07:00 PM	#1
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	7.5 rear how strong are they? Ok well i just bought this 81 coupe. It has the stocker rear end/gears in it...Should i just change the gears to 4:10's or just swap out the whole 7.5 for a 8.8 or 9 incher? I'm not sure how much abuse the 7.5 can handle Its my first Fox. __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx

October 31st, 2008, 07:09 PM	#2
stangfreak Banned MEMBER #334 Join Date: Feb 2006 Location: Wyandotte County Posts: 1,633 iTrader: 0 reviews	i'd swap for an 8.8 if it were me __________________ [SIGPIC][/SIGPIC] [SIZE="4"]"This just in....14.79 @ 92.15 is not fast"[/SIZE]

October 31st, 2008, 07:13 PM	#3
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	Thats what i was thinking about doing. My dad has an extra one setting at his house...The engine is a built 302 bored .30 over nothing crazy...has a healthy cam in it. It i'll be street and drag. I know i'll be ragging on it hard. __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx

October 31st, 2008, 07:30 PM	#4
vfast Banned Join Date: Aug 2005 Location: shimmy shack takeout Posts: 1,084 iTrader: 0 reviews	it will be ok....handle 400 hp with no problem __________________ EVERYONE IS ENTITLED TO MY OPINION:cool: 6'ers are for kids 1965 chevelle SS 421 sbc 6 speed, 3.90 gears,alum d-shaft, brodix heads,roller cam,925 AED carb...grocery getter[COLOR="Red"]RIP[/COLOR]

October 31st, 2008, 11:40 PM	#5
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	just swap the 8.8 so the possibilities are endless ;D __________________

November 1st, 2008, 01:20 AM	#6
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	cool thanks peeps...just getting the gears now... __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx

November 1st, 2008, 09:37 AM	#7
vfast Banned Join Date: Aug 2005 Location: shimmy shack takeout Posts: 1,084 iTrader: 0 reviews	why waste the time of an 8.8 swap unless it's a 5 lug/disc conversion __________________ EVERYONE IS ENTITLED TO MY OPINION:cool: 6'ers are for kids 1965 chevelle SS 421 sbc 6 speed, 3.90 gears,alum d-shaft, brodix heads,roller cam,925 AED carb...grocery getter[COLOR="Red"]RIP[/COLOR]

November 1st, 2008, 01:24 PM	#8
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	the 7.5 is very weak at least get a 8.8 for something reliable __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

November 1st, 2008, 01:50 PM	#9
1bad331 Regular Join Date: Mar 2008 Posts: 101 iTrader: 0 reviews	if your dad has the 7.5 use it, i put a free one in my car why i rebuilt my 8.8 it stayed for a year and the car ran12.8 on the slicks with a 6000rpm dump for two full days of racing i was kinda wanting to blow it apart but it held, this motor i had on it put 385rw ftlbs on the dyno

November 1st, 2008, 02:15 PM	#10
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	Yeah he said we could swap the 8.8 in it if i wanted...But i think i'll stick with the 7.5 till it goes caaa.....clunk..... http://i66.photobucket.com/albums/h2...393171381a.jpg http://i66.photobucket.com/albums/h2...783ba6d51e.jpg http://i66.photobucket.com/albums/h2...969a86aa15.jpg http://i66.photobucket.com/albums/h2...ba76e2e61f.jpg Pics of the 81 coupe __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx Last edited by mtw002; November 1st, 2008 at 02:18 PM. Reason: forgot

November 2nd, 2008, 10:19 AM	#11
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	7.5 will not hold much more then 300ft lbs of tq. i blew 2 apart of them apart when i was running 7.5s in my 2.3 turbo Mustang like 2 years ago, there not very strong. __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

November 2nd, 2008, 01:03 PM	#12
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	if you have an 8.8 use it. but i personally think the 7.5 is stronger than it gets credit for. But most are tracloc. unless someone put a ranger pumpkin in it __________________ 1986 Mustang GT t-top time piece!

November 2nd, 2008, 02:29 PM	#13
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	Use the 7.5 for now Build the 8.8 for when the 4 banger rear blows up __________________ weeee foooord!

November 3rd, 2008, 07:42 AM	#15
M L Struck Hardcore Enthusiast 85 GT/86 SVO/2010 GT500 Join Date: Oct 2008 Location: Rossville IN Posts: 1,183 iTrader: 0 reviews	If you keep the slicks off of it will last, I ran 12.70s in my 85 GT until it blew up and it was just the spider gears so replaced them with junkyard parts and finished the season and then put in a 9" all problems gone now.

November 3rd, 2008, 12:06 PM	#17
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	They will handle 400 hp and about 200 ftlbs of torque...lol One good launch with sticky tires and a stock 5.0 and see ya later __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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November 3rd, 2008, 01:32 PM	#18
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	Well the car is a 81 4cyl coupe converted to 5.0. Stock rear end, stock gears...I'll just throw some gears in it and slicks. If it blows it blows. Also a 5.0 bored .30 over is a 306 right? __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx

November 3rd, 2008, 01:45 PM	#19
orangeRcode Hardcore Enthusiast 11.21@123 -150 shot Join Date: May 2006 Location: Mustang/Yukon, OK Posts: 1,828 iTrader: 1 reviews	The 7.5s are stronger than you think. It also depends on what tranny/power adder you are running. I have a buddy with a 4 cylinder coupe converted to a 5.0. He is currently running a c4 and turbo making ~450 rwhp and the rear is still going after 2 seasons on slicks. It amazes me every time he launches it and it doesnt generade. : __________________

November 3rd, 2008, 06:52 PM	#20
86_Notch Hardcore Enthusiast 1986 lx notch 9.98 @ 135 Join Date: Mar 2007 Location: Delaware Posts: 1,522 iTrader: 0 reviews	strong enough to live behind an auto equipped ranger running low 11s on slicks don't waste your money on gears for the 7.5 tho, you can get 8.8s pretty cheap and you're better off saving your money for gears for it instead __________________ " Spending money I don't have.... on things I don't need .... to impress people I don't know " .

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