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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