454. Is 3,000 RPM cruise so bad? - Page 3 - Chevelle Tech
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post #31 of 47 (permalink) Old May 20th, 19, 10:31 AM
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Re: 454. Is 3,000 RPM cruise so bad?

The engine should have no problem living at 3,000 RPM all day long. In the 1970's and 1980's the 3/4 ton pickup came with 4.10 gears and if you had a TH400 3,000 RPM was 60 MPH and if you opted for 4.56 gears 3,300 was 60 MPH! I have owned several of those trucks over the years used primarily for towing. They all went 100,000 miles and over, mainly on the highway, with no issues. Well one issue, a 1979 I had went 300 miles before it had to go back for a new cam (factory recall due to improperly hardened cams) and found two damaged lobes, was fine for the next 120,000 miles!
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post #32 of 47 (permalink) Old May 20th, 19, 11:10 AM
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Re: 454. Is 3,000 RPM cruise so bad?

Quote:
Originally Posted by any4xx View Post

Oh... and the 1,200 RPM idle is only there so that it can idle at 800 RPM in gear. If I set the free idle at 800 the engine dies when I put it in gear. The converter I have is tight enough to drop 400 RPM at idle!
Look, I'm trying to be a clutch artist, but with a TQ converter the artistry is in the manufacture. I always thought if I went auto, I'd likely need to drop $700-900 on a well MANUFACTURED converter. Loose but tight, if you know what I mean. Yours seems too tight. I'd opt for a nice tight 25-2800 rpm stall.


And oh, yeah, what Laguna Tom said. There's the empirical data you need. I'll repeat myself, its an EMOTIONAL thing, not a mechanical thing. We're used to OD is all. The engine builders dont fret on it, why should we? Neo-liberals have a new "home garage GAFE" rating we have to adhere to now? And even so , do the math on saving 2-4 mpg across 2000-3000 miles. That ought work out to 10-20 gals a fuel a year a year. One tank full. So, to spend 3G's for that, your grandkids have to keep driving the car to make it up.

Plus, if I'm worried about that stuff, its a computer controlled powerplant I seek. Screw 18 mpg with a carb, or EFI'd rat. Go computer controlled everything and 25 mpg.
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post #33 of 47 (permalink) Old May 20th, 19, 1:29 PM
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Re: 454. Is 3,000 RPM cruise so bad?

3,000 RPM won't hurt a thing, it just gets old lol
I am going to over drive because I hate "cruising" at 3300 on the freeway.
My target is 2000. It will help keep the oil and coolant cooler as well.
Plus I want more gear for WOT so I am not running out of gear.
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post #34 of 47 (permalink) Old May 20th, 19, 8:58 PM Thread Starter
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Re: 454. Is 3,000 RPM cruise so bad?

I decided to do a cheap experiment before I make any final decisions. An off-the-shelf Hughes 2,500 RPM converter is on order. Hopefully I will have it in this week to at least figure out if my converter is my lo-po problem. Hopefully I donít explode my unknown-quality TH-350, but if I do, I guess it gives me the excuse to upgrade.

In the mean time, my original question has been answered many times over. That was regarding whether a 3K RPM cruise would be a problem. Sounds like itís just fine. Iím hesitant to go with an overdrive with those gears, as a 200-4R would have me cruising at around 1,700. I think this engine would be happier cruising at over 2K. Who knows though: I may end up with the 200-4R and some 4.10ís, or if this converter makes a big difference I may drop my final to the low-3ís. At least I know Iím safe where Iím at.

Thanks again for all of your input.

Tom.
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post #35 of 47 (permalink) Old May 20th, 19, 9:22 PM
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Re: 454. Is 3,000 RPM cruise so bad?

Quote:
Originally Posted by any4xx View Post
In the mean time, my original question has been answered many times over. That was regarding whether a 3K RPM cruise would be a problem. Sounds like itís just fine. Iím hesitant to go with an overdrive with those gears, as a 200-4R would have me cruising at around 1,700. I think this engine would be happier cruising at over 2K. Who knows though: I may end up with the 200-4R and some 4.10ís, or if this converter makes a big difference I may drop my final to the low-3ís. At least I know Iím safe where Iím at.
Thanks again for all of your input.
Tom
With a 200R4, if you're seeing 3,000rpm at cruise in 3rd, its .67 fourth gear would drop that to 2,000rpm.

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post #36 of 47 (permalink) Old May 20th, 19, 9:34 PM Thread Starter
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Re: 454. Is 3,000 RPM cruise so bad?

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With a 200R4, if you're seeing 3,000rpm at cruise in 3rd, its .67 fourth gear would drop that to 2,000rpm.
Yes. I guess I was more thinking of the 55 MPH cruises. That 3K is the 70 MPH cruises. I got a quote from Art Carr a few months ago for his TH200-4R and have been sitting on it until I make up my mind. I guess thereís no law that says I canít hold it in 3rd gear for the normal driving...
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post #37 of 47 (permalink) Old May 20th, 19, 9:53 PM
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Re: 454. Is 3,000 RPM cruise so bad?

Art built my current 2004r. It's a nice quality piece.

I got mine with no lockup as well, so even in 4th as you slow down it isn't bucking or anything as the converter still deals with it, and stall speed is around 2700-2800, but it's a tight converter so cruising around it's not that high until you mash it.

I'm gonna swap out my 10 bolt to a 12 bolt with 4.10 gears as soon as I get time. With 3.08 gears 4th gear is just silly right now.

Quote:
Originally Posted by any4xx View Post
Yes. I guess I was more thinking of the 55 MPH cruises. That 3K is the 70 MPH cruises. I got a quote from Art Carr a few months ago for his TH200-4R and have been sitting on it until I make up my mind. I guess thereís no law that says I canít hold it in 3rd gear for the normal driving...

1972 Chevelle, 454, 2004r, 3.08
1981 Camaro Z28, 355, TH350, 3.73
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post #38 of 47 (permalink) Old May 20th, 19, 10:22 PM
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Re: 454. Is 3,000 RPM cruise so bad?

Wow! I find it hard to believe so many people drive these old cars everyday.

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post #39 of 47 (permalink) Old May 21st, 19, 11:39 AM
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Re: 454. Is 3,000 RPM cruise so bad?

Ya right? I have to admit, it did make me feel EMOTIONALLY better that I was holding a short stroke rat at 3300 rpms for hours and hours at a time. And decided not to go long stroke ( 4.25") for the same reason.

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post #40 of 47 (permalink) Old May 21st, 19, 12:59 PM
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Re: 454. Is 3,000 RPM cruise so bad?

No reason to use OD unless youre on the hwy at least you have the option of using it.
3k is fine for 70

Putting a 3.08 in a cammed car is going backwards....use a little more gear and get an OD. Use 1-3 in town, OD when youre on the interstate I bet 2k is the min of where youll want to be. Youll love it..burn up the visa and do it. Use a good trans cooler!
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post #41 of 47 (permalink) Old May 21st, 19, 8:23 PM
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Re: 454. Is 3,000 RPM cruise so bad?

Quote:
Originally Posted by any4xx View Post
I decided to do a cheap experiment before I make any final decisions. An off-the-shelf Hughes 2,500 RPM converter is on order. Hopefully I will have it in this week to at least figure out if my converter is my lo-po problem. Hopefully I donít explode my unknown-quality TH-350, but if I do, I guess it gives me the excuse to upgrade.
A converter can make a huge difference. I drove a 1972 Cutlass for several years and other than dual exhaust, HEI, and a sightly higher stall converter, it was bone stock. No upgraded cam, no headers, everything else factory. It had highway gears and was no beast, but it was quick and during the 1990's was quicker than most anything else on the street. After about 10 years the transmission lost 3rd gear and I had it rebuilt. As I was a student at the time, I went for the cheapest quote. I highly regretted it as afterwards it was a complete dog. I don't know what exactly was done, but it had a noticeably lower stall and no guts.

I hope the Hughes converter fixes it for you. Looking forward to your report.
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post #42 of 47 (permalink) Old May 21st, 19, 9:29 PM
 
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Re: 454. Is 3,000 RPM cruise so bad?

I got 2 cents to put in 66 chevelle 396 street set up .500 lift cam 2200 rpm stall speed 302 gears 350 trans perfect compo. smokes the tires at 30 miles and hour Beast
2nd car 1971 monte carlo 427 street set up .519 lift cam O.E. stall speed 302 gears disappointed with take off . rpm's under 2000 with my foot in it until i hit the freeway
over 50 comes a live rpm's closer to the sweet spot over 70 in the money. not a beast
around town. I just order a B&M converter 2000 stall speed. so ya If you want to burn
rubber all day....

Last edited by REALSTEEL; May 21st, 19 at 9:32 PM. Reason: 308 not 302 gears
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post #43 of 47 (permalink) Old May 21st, 19, 10:45 PM
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Re: 454. Is 3,000 RPM cruise so bad?

wrong gears

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post #44 of 47 (permalink) Old May 25th, 19, 12:57 AM Thread Starter
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Re: 454. Is 3,000 RPM cruise so bad?

The plan WAS to dash home from work today and install my new converter. Everything went great until I dropped the old converter while removing it and bent up the drip pan holding about three quarts of ATF. It was quite fun having that soaking into my shirt while scrambling out from under the car. But undeterred, I threw kitty litter and crawled back in. I then decided that breaking one of the cooler line fittings at the transmission case would be an even better trick.

So in short, my new converter is in. But the car is still up on jacks while I wait for new fittings to arrive. I must say that trying to get the brand new cooler lines to stop leaking a few months ago was quite a nuisance. So this is my excuse to graft in -6 AN pigtails from the transmission to the lines where I will cut them off just ahead of the starter. Waiting on parts now.

Oh the joys of working on older cars....
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post #45 of 47 (permalink) Old May 25th, 19, 1:09 AM
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Re: 454. Is 3,000 RPM cruise so bad?

Order it on Amazon and it will be waiting for you to wake up in the morning. LOL

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