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post #1 of 9 (permalink) Old 09-20-2009, 11:24 AM Thread Starter
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whats gears do i have

What are the stock gears in my 95 bird lx 4.6 auto. i am debating on what gears to change to ,this is a 1/4 mile car with 28in tall rear tires and thought i would go with 4.30 rear gears or is that to steep? I do drive it to the tracks and around town. 1 1/2hr to the track.
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post #2 of 9 (permalink) Old 09-20-2009, 11:40 AM
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http://www.tccoa.com/articles/gears/gears.html

Probably 3.27.

What type of modifications have you done? I think 4.30 is too steep for a near stock 4.6 SOHC with the stock torque converter or even the Mark VIII/Marauder/GT TC.

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post #3 of 9 (permalink) Old 09-20-2009, 11:58 AM
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What MPH is the car trapping at (or are you expecting it to trap at)?

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post #4 of 9 (permalink) Old 09-20-2009, 01:08 PM Thread Starter
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k/n ram air, 2 1/2 true duals, dr gas xpipe/ flowmaster 40. good tune up, street tires. it went 15.11 @ 91mph not sure if thats good for these or not. Working right now on removing weight then new DOT and skinnys.
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post #5 of 9 (permalink) Old 09-20-2009, 01:11 PM Thread Starter
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Bangster thanks for the link its got a Y which means 3.08s [ YUCK]
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post #6 of 9 (permalink) Old 09-20-2009, 03:03 PM
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Assuming a 5500 rpm limit, with a 28" tire, your "ideal" gear ratio would be right around 5.00:1 for a 91 MPH trap speed.

Also, with a 28" tire, running 5500 rpm through the traps...

4.10's will put you at 112 MPH
4.30's will put you at 106 MPH
4.56's will put you at 100 MPH
4.88's will put you at 94 MPH

All of that being said, it really depends on what you're willing to give up on the highway in terms of "cruiseability" (yes, I'm calling that a word) and whether you want room to grow (planning more mods down the line).

4.30's will feel pretty steep, but they'll make a significant impact on your E.T. With 28" rear tires, they would be a good choice for a mostly 1/4 mile car with your current mods, IMHO.

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post #7 of 9 (permalink) Old 09-20-2009, 04:10 PM Thread Starter
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Thanks for all the good info, looks like 4.10 are the way to go to allaw some changes in the future.
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post #8 of 9 (permalink) Old 09-20-2009, 09:17 PM
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If your 95 V8 has the stock gears, you should have 3.08s. Look up info on driveshafts, I don't think your stock one will work good for 4.10s. Our shafts are too long.

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post #9 of 9 (permalink) Old 09-21-2009, 01:09 AM
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95 V8s can have either 3.08s or 3.27s. The driveshaft won't be affected at all by the gear ratio. If you were swapping from a 7.5" to an 8.8" the driveshaft might be too long but not if you're just swapping gears.
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