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1972 Thunderbird gearing

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1972 Thunderbird gearing Empty 1972 Thunderbird gearing

Post  ThunderCat March 5th 2015, 4:22 pm

Street driven land ox of a 1972 Tbird. Large heavy car. Sluggish...

N code engine: 429 Cubic Inch V-8 Engine (212 Net Horsepower)
Bore 4.36" x Stroke 3.59"/8.5:1 Compression Ratio

Rear axl code 2: 2.75:1 gearing Crying or Very sad

Parts in hand for install:
Holley 670 carb (might swap to 750 if find a buyer for this 670)
Lunati voodoo cam 10350702
Lunatti springs retainers locks 73815k5
Rhodes lifters 9008
Cloyes double roller true timing 9-1122
Weiland stealth 8012
B&M 40262 shift kit

Waiting to order:
Hooker 6115 headers (believe these will fit)
new dual exhaust (has dual now; factorywas single not dual, done before i purchased)

Wheel/tire combo on car:
255/55/18 rear
225/55/18 front

what ring and pinion set would yall recomend? 3.31:1? 3.55:1? 3.73:1? ....

thanks!
ThunderCat
ThunderCat

Posts : 11
Join date : 2015-03-02
Age : 36
Location : Clovis, CA

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1972 Thunderbird gearing Empty Re: 1972 Thunderbird gearing

Post  crittersf1 March 6th 2015, 5:12 pm

Intended for what primary use?
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1972 Thunderbird gearing Empty Re: 1972 Thunderbird gearing

Post  ThunderCat March 6th 2015, 6:14 pm

Street driven car. My daily driver. Sees 40ish miles a day. Some freeways in town not travel type Milage.
ThunderCat
ThunderCat

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Post  crittersf1 March 7th 2015, 9:13 am

4.10's if it were me.
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1972 Thunderbird gearing Empty 3.50-3.25 ??

Post  manofmerc March 11th 2015, 6:13 am

On my street car (66comet) C6 with 225 70 r 15 tires 3.50 gear ratio I am turning 2800-3000 rpms at 60 mph .That will give you an idea on speed and rpms .A lower gear ratio such as 3.50-3.70 4.11 will give you great acceleration but hurts your mpg and isn't a whole lot of fun on the highway .I think if I were you I would try for a 3.25 .Going from 2.75 to 3.25 you will have more acceleration and still be able to run the highways .I had my comet on the highway the other day at 3000 rpm I was staying up with traffic but most were passing me .Whenever you get your engine mods done consider a good torque convertor for you big bird .Remember that there are different convertor snouts on early c6 429 combos .Check yours before doing anything .Doug

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