Quote:
Originally Posted by scott70
Most of my " normal" driving is around town,55 mph and 65 mph. The 2.87 first gear is appealing to me as much as having the overdrive. I will admit I'm not much of a putt putt. The car has its original drivetrain but I put it through its paces. Have been since 1986.
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Just my opinion, but you really need to drive your current setup and find where your engine or combo starts to lug the engine. This will be a starting point of what you'll be comfortable with. After that it will be rear gear change or tire sizes to match up. I was gonna do the .72 O/D, but at 60 mph I'd be at 1900rpm which is not good. My engine starts to lug at around 2000 to 2100 rpm. I can always go back to 3.23 or 3.42 gear if I want more cruising time. So with 3.23 gear at 80 mph would put me at 2500 rpm. but that's not how I want my car to run.
So just for example 60 mph 28" tire 3.23 gear .64 od I'd be at 1500 rpm. My setup would need to go 90 mph just to see 2200 rpm. This is what my friend pointed out to me with the .72 I'd have to drive at 70 mph to keep engine happy.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
Last edited by chuckies76ta; 05-07-2023 at 10:48 AM.
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