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Author
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Topic: Help me choose a gear?
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Warhorse
Journeyman Posts: 49
From: Greenwood,SC
Registered: Dec 2002
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posted 05-25-2003 10:12 PM
   
I need help in choosing a gear for my car. I just did the 5-lug conversion on my 92 coupe. I am running the pro star rims with 275/60 BFG's with a 3.73 gear. With the bigger tires it has taken away my gear a good bit. I have the Holley Systamax II kit with the usual bolt ons. My question is do I go with the 4.10 or the 4.30? What would the 4.30 be like in the 1/4?Thanks, James ------------------
65 mustang
drag car, 302, Elderbrok torker intake, Holley 650 double pumper, Comp cams .592 lift, 289 heads w/ 351 valves, longtube headers, narrowed 9 in. rearend w/ 5.86 gear, 31 spline axles, c-4 w/ Hurst shifter, ladder bar suspension, 31x13x15 slicks, 6 point cage
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Ryan Wilke
Gearhead Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 05-26-2003 09:13 AM
quote:
Originally posted by Warhorse:
I need help in choosing a gear for my car. ...do I go with the 4.10 or the 4.30? What would the 4.30 be like in the 1/4?
James,
Play around with the below formula: http://users.erols.com/srweiss/calcmph.htm - by plugging in different gear ratios with your tire diameter, trans gearing, etc. you can determine what gear will work the best for your car. Remember to keep in mind, the rearend gearing is just a part of your performance combination; do you care about gas mileage, engine longivity, being able to hear inside the car, or whether or not you've got enough engine power to deliver the necessary power to keep the power twisting to the gears!  Good Luck! Ryan 
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Toronado3800
Gearhead Posts: 364
From: St. Louis, MO
Registered: Jul 2001
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posted 05-27-2003 03:24 AM
I'm not sure I'd spend the money for the difference but maybe a milder bump up to something like 3.90's would make things like they were. What did the web site recommend?
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68DARKHORSE
Gearhead Posts: 417
From: Austin, Tx
Registered: Aug 2002
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posted 05-28-2003 10:24 AM
4.10s will put you back where you were.
Many T5 guys run 4.10s with a 26" tire.4.30s with that 28" tire will get you 126mph @ 6500rpm in 4th gear. Go for 4.30s if you don't need to drive on long trips.
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