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Old 06-06-2011, 06:18 AM
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Whats you cruising RPM with a BB & 4.30 Gears

Hi All

Just wondering what you 4.1, 4.3, or 4.8 owners feel is a safe comfortable cruise RPM on the street with a 454 T-400 Combo. Right now with my 4.30's and 31 x 18.5 Rear Tires if I do a few exits on the parkway 3000 RPM is normal parkway speed (60 - 65). I know that's a nice safe right lane cruising RPM but if you want to move to the left lane and keep up with traffic at 75 - 80 MPH you obviously raise the RPM and I just dont know if cruising at 3500 or more "for a sustained amount of time" would be recommended.

I know I can drop down to 4.1 and may consider that in time but I love the way the car runs with the 4.3 and they are so fun on the street But
I also like to join in on occasional Car Club Cruises so I was just wondering what RPM you guys try to run as a max sustained cruising RPM ???

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Old 06-06-2011, 06:34 AM
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Sounds to me like you could really benefit from a TH2004R. Best of both worlds, w/the right rear gear to keep low gear from being too short. Or a GV OD swap.

In any event you'd like the cruise RPM to compliment the power band of the engine so as to not lug the engine too far below the torque peak, yet not be so high that all hopes for any mileage is lost. I would think that a cruise RPM of around 2500 should be comfortable for you AND the engine, providing the engine will pull that RPM w/o lugging.
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Old 06-06-2011, 07:20 AM
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Oh yeah, the good old days. 480+ cubes, 4.33 gears, 30" tires. Had to make 137 mile x-way trip twice a week. Good thing premium gas was $.29 and 3500 cruise rpm wasn't considered too high.
And there was always the 3.23 geared muscle cars wanting to mess with you for a little "top end" 75+ mph running..
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Old 06-06-2011, 10:00 AM
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the formula for GEAR RATIO vsTIRE DIAMETER

(RPM=mph x trans ratio x gear ratio x 336 ) / tire diameter

30 tires rpm at 65 mph

3.90===2839rpm

4.10===2985rpm

4.30-----3130rpm

4.56---- 3320rpm

4.88-----3553rpm

5.12-----3727rpm
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Old 06-06-2011, 10:28 AM
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Quote:
Originally Posted by cobalt327
Sounds to me like you could really benefit from a TH2004R. Best of both worlds, w/the right rear gear to keep low gear from being too short...
The 200's a great tranny but you'd have to drop some coin to make it live, plus the expense of a new converter. OTOH, you can get a full manual 4L80 from Jakeshoe for less than 2 large. Not sure, but you might even be able to retain your 400's converter...

Russ
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Old 06-06-2011, 12:54 PM
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Thanks All

Great chart General and I Thank You because after looking at it there is no way it makes sense to go to 4.1 or even 3.9 for the slight difference it will make, and I surly wont go to 3.7 or 3.5 so the 4.3 stays
(hell I could probably run a taller tire and gain more)

Great Post Bob and exactly what I wanted to hear
( shh dont tell anyone but yesterday I had it over 5K in 3rd )

S10 I hear what your saying but in my case I think the Gear Vendor Under / Overdrive unit would make the most sense so I guess it's time to start saving if I want to do more parkway driving...
http://www.gearvendors.com/hrgm3s.html

THANKS ALL
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Old 06-06-2011, 09:22 PM
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Im glad to be of service ,use the formula.That came from Tex Smiths Hot rod chassis .

Man your car is an animal I bet it going to be fun.If you have any Youtube vids

Ill be glad to see them.
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Old 06-07-2011, 05:56 AM
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Thanks for the Compliment, I havent made any good vids yet but I promise I'll work on it
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Old 06-07-2011, 06:53 AM
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you can get a built 200r4 for half the cost of gv od and have a better box .
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Old 06-07-2011, 09:21 AM
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Quote:
Originally Posted by shine
you can get a built 200r4 for half the cost of gv od and have a better box .
You may get a Rebuilt 2004R for 1/2 the GV price but, a 2004R to handle a stout 454-BBC will cost about 2 Large ones.
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