With short tires like that, you might be alright. Although that also depends on how 'radical' that 327 is. That engine may not like taking off with a somewhat tall gear. The 3.07 gear would likely be okay with the TH350, and maybe a small stall converter if the engine needs one.
IMO the 3.42 gears are a good comprimise. Here is a chart that gives you some rpm comparisons.
http://www.sierrabronco.com/TireGearRatio.htm
And here's another online rpm calculator.
http://www.csgnetwork.com/multirpmcalc.html
Quote:
Originally Posted by LostMy65
This is regarding my 65.
Right now it has a 3.90 rear from a 62.
The tires are only 26" tall.
I really don't think I'll benefit from an OD Tranny because I'll rarely get above 55 mph. And most of my driving will be 40. 45 tops.
Eventually I'm thinking of putting a th350.
The engine is a 327 that requires premium octane fuel.
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