Should I swap in 4.10's for my 3.73's- please read
 

OK, I have an extremely heavy 95GT convertible. The lightest the car has ever weighed when it was pretty much stripped was 3510 without me, or 3680lbs with, but it is normally over 3700 with me. It even weighed in at 3803lbs with me, a lot of gas, and some luggage at Englishtown NJ last year on a 97.2mph pass. Anyway, I just got a set of 165 AFR heads for it that will be milled to 55cc's by Ed Curtis and he will also custom grind my cam for me. He recommended I go with 4.10's in my car with its weight and the cam.
Now, this week I'm having my traction lock rear redone with new clutches and its costing me $65, but a gear swap will only run me about $95 from the same guy, so I figured what the heck, it won't cost much more to have it done now. My cousin also has a set of 4.10's with about 2K miles on them that I can have for real cheap. So should I swap in the 4.10's now since it seems to be the perfect time to do it, or will they be too much for my street car that is a 5 speed? Right now the car is daily driven, but since I got a new job I'll be buying a new vehicle and retiring the stang to nice weather driving. My goal is to have the car trap at around 105mph+ and with some luck maybe break into the 12's. I alsi run Nitto DR's as my street tires. Thanks, I appreciate all input on this.

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95 GT convt' 5 speed, 3.73's,FMS HD clutch, Pro 5.0 shifter, ASP alum. underdrive pulleys, Bassani offroad X pipe, 2 chmbr flowmasters, K&N w/o silencer, edelbrock performer intake, FRPP 65mm T-body, FRPP shorty headers, FRPP aluminum driveshaft.Hooker 4pt chrome car bar, Xenon/Wings West ground effects, custom interior
Best ET: 13.83
Best MPH: 98.55mph with Best 60': 1.91 on Nitto DR's
Homepage: <A HREF="http://www.angelfire.com/pa2/killercanary" TARGET=_blank>http://www.angelfire

Do it!

kevin

79 Fairmont SW, 5.0HO, C80E-F heads, Weiand Xcelerator, Demon 625, T5X, 8.8, 3.73, SN95 front brakes, SN95GT wheels, etc, etc, etc. Not fast enough yet! http://www.angelfire.com/md2/bug

[This message has been edited by Fairmont Kevin (edited 03-25-2001).]

Most definately do it!

Especially if ED Curtis told you it would be the best thing to do since it would also match your overall combination.

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Paxton Blown 87GT

I agree, the 4.10's will really help get your heavy car out of the hole with that new cam and head combo.

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1991 LX Hatch 5.0L

Well if Ed said so... and you also have a good amount of weight in that thing. If you are thinking about unloading the 3.73s let me know. I think I could find a use for them.

4.10s would probably be the correct gear for your goal.



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351W 89 Mustang GT Convertible

Ditto! 4.10's are nuts! I believe Rebel79 is running them with a 5 speed. Contact him.

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87 GT
Full exhaust, K&N, KB Subs, BBK STB, homeade dumps...


87 Taurus
New York
Winters Bite!

Thanks for all the input guys. I just keep hearing that 4.10's make up for a "weak" motor, and I don't like that saying. I also don't want to install them and hate very minute of it either. I'm just nervous as to whether or not I'm going to hate to drive it with such steep gears. I wish I could find out what my MPH would be at 6000rpm's in 4th, that would help me decide I think too. I found out today that my cousin doesn't want any money for the gears so all I'll have to pay for is the new clutch pack for the rear and the installation of the gears and clutches. I think I will do it. Do you think it will slow me down with my current setup? Not that it really matters, but I'd like to know. Also- am I gonna be approaching the factory rev limiter with these gears in the 1/4? I'm hoping to be at or around 105+.

RJ_STANG- sorry man, my dad just bought the Holley Systemax kit for his 91GT and he wants my 3.73's to replace his 3.55's.

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95 GT convt' 5 speed, 3.73's,FMS HD clutch, Pro 5.0 shifter, ASP alum. underdrive pulleys, Bassani offroad X pipe, 2 chmbr flowmasters, K&N w/o silencer, edelbrock performer intake, FRPP 65mm T-body, FRPP shorty headers, FRPP aluminum driveshaft.Hooker 4pt chrome car bar, Xenon/Wings West ground effects, custom interior
Best ET: 13.83
Best MPH: 98.55mph with Best 60': 1.91 on Nitto DR's
Homepage: &lt;A HREF="http://www.angelfire.com/pa2/killercanary" TARGET=_blank&gt;http://www.angelfire

[This message has been edited by Killercanary (edited 03-26-2001).]

Yes, this can be true. On the contrary, a "strong" higher revving motor excels with more gear because it gets the revs into the powerband faster, which means better ET's. This is especially true for heavy cars.

If you have a 26" tire, you will be turning 113.5 mph with 4.10's.

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1991 LX Hatch 5.0L

Thanks JONNYK- that's what Ed told me. He said that since I have such a heavy car I need the extra gear to get me moving and into the power band. Thanks for the info on the MPH at 6000RPM's- that's about what Ed told me tonight. Looks like they are going in this week.

If Ed is custom grinding a cam for you it has a lot to do with the gears you have. FOr instance my Anderson cam is made for a car with 4:30 or higher gears due to the low lift numbers with less gear it would be a PIA at low rpms. Go for 4:10's! http://www.mustangworks.com/msgboard/biggrin.gif



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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!

From reading you post title I was going to say no. But now I see how cheap you are gettin them, and I say definatly go for it. Therse only a few % difference that is about 300rpm on the freeway in 5h gear. So I wouldn't worry about it. I think you'll hit 12's no problem.

Skyler

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-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
Runs on 87 Octane and gets 24mpg!

I run 4.10's and even on the highway it's not bad with the overdrive. I'm glad I did it!

Thanks for all the input. The 4.10's are going in tomorrow along with the new clutch pack so it looks like I'll be ready for the track opener on sunday!!!

Congrats on your time SKY, glad to see you broke into the 12's. What was your rpms at when you crossed the finish line if you remember, the reason I ask is that I hope to around your MPH, so I should be close to the same rpm's you were at when you crossed.

Killercanary, what is your dad going to do with those 3:55's he has? Would he want to sell them?


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'82 GT 351W,BBK shorties,
Comp Cam,edelbrock intake
625 cfm carter carb. c-4 tranny w/ pro stick shifter. 4 core radiator
Mallory distributor. 3:27
.........................

82GT- sorry, my dad is selling them to a local guy around here, but the same guy is having problems with his heads right now, so if he backs out I'll let you know. Ask the guy I told you about doing the instal, he sometimes has gears just laying around his shop. He has tons of T-5 parts too if you need them as well. Hell, Hanlon motorsports calls him when they need a part they don't have!

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95 GT convt' 5 speed, 3.73's,FMS HD clutch, Pro 5.0 shifter, ASP alum. underdrive pulleys, Bassani offroad X pipe, 2 chmbr flowmasters, K&N w/o silencer, edelbrock performer intake, FRPP 65mm T-body, FRPP shorty headers, FRPP aluminum driveshaft.Hooker 4pt chrome car bar, Xenon/Wings West ground effects, custom interior
Best ET: 13.83
Best MPH: 98.55mph with Best 60': 1.91 on Nitto DR's
Homepage: <A HREF="http://www.angelfire.com/pa2/killercanary" TARGET=_blank>http://www.angelfire