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#1
11-19-2011, 09:24 PM
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3.23 to 3.73 gears
presently have 72 formula with 406, ported 13's crower 60916-221/229cam, auto with 3.23 gears and 28in tires, am i right to believe that going to 3.73 gears will provide a noticable diff in performance, i don't drive much over 50 - 60 mph when on the hwy so revs are not critical. Did read the archives and some experiences were shared.thks
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#2
11-19-2011, 09:45 PM
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I recently swapped from 3.08 open to 3.42 posi, which is about 11% increase in gearing. I did notice a nice increase in acceleration. When I swapped my th350 for a th700R4 with its deeper 3.06 1st gear it provided about 21% increase in gearing. That was like "holy crap" increase in acceleration.
Your 3.23 to 3.73 change nets about 15% increase in gearing so I am guessing it would fall in between nice and "holy crap". Definitely noticeable IMO.
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1977 TA 400 9.5:1 CR 351hp 414LbFt, #13 Heads + 1.52 Roller rockers, 1968 Pontiac 400 intake, Holley 4165 650 DP #7054 Howards Hyd .447/.467 IN:288 EX:298 214/[email protected], MSD6A + MSD timing control + H2o/Meth 1-5/8" headers, Magnaflow 200CPI Cats + 2.5" Pypes X, Dynomax STs, TH-700R4 2200 stall, 3.42 Eaton 10-bolt, PS/PB/PW/PL/AC/Cruise [email protected] 2.18 60' on P255-60-R15 radials, pump gas, mpg : 21.5 hwy 15.2 city 
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#3
11-20-2011, 01:38 AM
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Similar set up in my GTO,a 406 w/Crower 60242 (similar to your 60916).
I switched from 3.23's to 3.90's this year. It pretty much rendered my street tires useless below 20 MPH. I went from a Goodyear 255/60/15 to a 10.5/27/15 MT ET Street to be able to get any traction. 60' times at the track dropped .3 of a second. Anyway,yes ,it made a nice difference with the gear change as far as acceleration. I too almost never drive on the highway. Any driving above 60 MPH is annoying.
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 ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. ‘55 Catalina ‘62 Mercury Meteor-all original, bought new by my grandfather 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride |
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#4
11-20-2011, 09:00 AM
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I have driven my 406 with 3:73 #12 heads crower 60210 229/239 @.50 on the hwy and it is a bear and 3500 stall, but only about 6 miles.
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Conrad 79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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#5
11-20-2011, 09:48 AM
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I have 4.11 gears with 275/60/15 tires in my Lemans. At 60 mph the tach shows around 3000 rpm. Plenty of power to the road but that rpm sustained is not good for an engine unless it's in really good condition. If I had known better at the time that I put them in I wouldn't have used them. I think 3:55 gears would work much better. Just my 2 cents.
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#6
11-20-2011, 11:09 AM
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If you are just looking for better acceleration, but keep your high gear for cruising why not try a lower first gear set, I ran One in my grandville when it had 3.42's and it was a big difference, think if i remember right it was worth 2 tenths and two mph in the 1/4.
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,[email protected]@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected] M/T 275/60 ET SS Drag Radial 2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's |
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#7
11-20-2011, 12:59 PM
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Quote:
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 3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" |
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