4.30 gear in a street car??

94pacecarSVT · June 29th, 2007, 11:57 AM

i've got a wild idea to put a 4.30 in my car after talking to kelby at harris racing and dale and custom performance. they both told me that if it were theirs they wouldnt put anything taller then a 4.10, and kelby said that a guy came to him last week and asked him to take his 4.10 out and put a 4.30 in....this car is my daily driver but i dont drive much...about 20 miles a day maybe. i'm not worried about gas mileage, i stopped caring when i got a v8. my only concern is my rear end. i know the 8.8 is strong, but should i upgrade to a 31 spine detroit locker when i do this? or should i be worried at all?

Euroeater95 · June 29th, 2007, 01:53 PM

I dont think that you need to go with 31 slpines because I dont think that it will be any harder on the axles or carrier. Dont expect to take it on the freeway though.

94pacecarSVT · June 29th, 2007, 10:00 PM

lol. why do you say that. i drive on the interstate almost everyday.

G.T. Rags · June 30th, 2007, 12:45 AM

cause ur rpms are gonna be hi....hiiiiiii like 27-2800 rpms doing 70 in 5th.......she'll be screaming any higher then that.

RockerShocker · July 3rd, 2007, 07:59 PM

might as well do the 31 splines, but no higher then 4:10's. Its a waste of time unless is a really high reving track car.

2007calispecial · July 5th, 2007, 01:18 PM

do 3.73 TRUST me guy... if you want to be able to pull at all in 5th gear lol do 3.73's its the perfect gear

94' Cobra 351 · July 5th, 2007, 04:59 PM

Originally Posted by 2007calispecial

do 3.73 TRUST me guy... if you want to be able to pull at all in 5th gear lol do 3.73's its the perfect gear

+1!

unless you don't like going high speeds, go with the 3.73!

Bullitt95 · July 6th, 2007, 05:19 PM

+2.
With a 4.30, your tach will be showing ~2650rpm at 70mph in 5th and the intermediate gears will be way too short. The 3.73 is the right way to go unless you're building a high revving engine (redline above 6500rpm and maximum HP above 6000rpm).

89StangGT · July 6th, 2007, 07:51 PM

my dad has drove his pro street camaro on the eway once or twice with 4.88 gears and a th400 three speed auto trans. and its a street car.

95opal · July 7th, 2007, 12:58 AM

410's FTW!

2007calispecial · July 8th, 2007, 07:35 PM

id say get 4.10's if you never pull the car above 120. id say get 3.73 if you want to go faster than that top end with a nice pull

Black Betty · January 13th, 2008, 01:15 AM

Yeap

June 29th, 2007, 11:57 AM	#1
94pacecarSVT Enthusiast 1996 Mustang GT 11.2@122.36 Join Date: Aug 2006 Location: North Carolina Posts: 622	4.30 gear in a street car?? i've got a wild idea to put a 4.30 in my car after talking to kelby at harris racing and dale and custom performance. they both told me that if it were theirs they wouldnt put anything taller then a 4.10, and kelby said that a guy came to him last week and asked him to take his 4.10 out and put a 4.30 in....this car is my daily driver but i dont drive much...about 20 miles a day maybe. i'm not worried about gas mileage, i stopped caring when i got a v8. my only concern is my rear end. i know the 8.8 is strong, but should i upgrade to a 31 spine detroit locker when i do this? or should i be worried at all? __________________ black 96 gt w/ non pi motor, cai, built t45, built rear end w/ 3.73's, completely modded suspension, race radiator.....startin over. www.rk-collection.com

June 29th, 2007, 10:00 PM	#3
94pacecarSVT Enthusiast 1996 Mustang GT 11.2@122.36 Join Date: Aug 2006 Location: North Carolina Posts: 622	lol. why do you say that. i drive on the interstate almost everyday. __________________ black 96 gt w/ non pi motor, cai, built t45, built rear end w/ 3.73's, completely modded suspension, race radiator.....startin over. www.rk-collection.com

July 3rd, 2007, 07:59 PM	#5
RockerShocker Newbie Join Date: Apr 2007 Location: Yuba City, CA Posts: 48	might as well do the 31 splines, but no higher then 4:10's. Its a waste of time unless is a really high reving track car. __________________ Fast, Cheap or Reliable. You get to pick TWO!

July 6th, 2007, 05:19 PM	#8
Bullitt95 Enthusiast 1995 Mustang GT auto 13.46@104.5 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 666	+2. With a 4.30, your tach will be showing ~2650rpm at 70mph in 5th and the intermediate gears will be way too short. The 3.73 is the right way to go unless you're building a high revving engine (redline above 6500rpm and maximum HP above 6000rpm). __________________

July 6th, 2007, 07:51 PM	#9
89StangGT Moderator Join Date: Aug 2006 Location: Toledo Ohio Posts: 1,110	my dad has drove his pro street camaro on the eway once or twice with 4.88 gears and a th400 three speed auto trans. and its a street car. __________________ MM COBRA CLUB # 56

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June 29th, 2007, 01:53 PM	#2
Euroeater95 Regular Join Date: Sep 2006 Posts: 157	I dont think that you need to go with 31 slpines because I dont think that it will be any harder on the axles or carrier. Dont expect to take it on the freeway though.

July 7th, 2007, 12:58 AM	#10
95opal Hardcore Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 1,165	410's FTW! __________________

January 13th, 2008, 01:15 AM	#12
Black Betty Regular 2001 Mustang GT Join Date: Dec 2007 Location: North Carolina Posts: 102	Yeap

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