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jaspermaggie · Bel Air Joined: 29 Jan 2006 Posts: 146

I have a 55 chevy with th350 and 4.11. The car runs 3,000 at 55mph. I would like to start driving to the track and more events. Do you think I will have problems? If so what. I can not put a 700r now or traler it. I would need a truck and traler. Thank's

It is a 355 new rebuild B&M trans. It runs cool 180 and 60psi oil.

57boxman · Posted: Sun Sep 23, 2007 2:11 pm Post subject:

I feel your pain. I have similar problems. I have a 3:42 and at one time a 3:55 rear ratio with a 4 speed with a 1:1, 4th gear. 2750 rpm is about 60 mph; 3000 is 65 or so.

The biggest problem I have when I run over 3000 rpm is that the car vibrates different bolts loose.

She use to overheat but I replace the radiator and that problem was fixed.

And of course your gas mileage will be terrible. I get around 10 mpg on a good day.

My 2 cents. Drive it and don't worry about it. The only way you will find out if high rpms will cause a problem is to get it out on the road and find out. Also, If you have a boat you would run 4000 to 5000 rpm all day and not worry about it.
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orange56 · Posted: Sun Sep 23, 2007 2:49 pm Post subject:

Have a 4.30 gear and drive it on the street with no ploblems. Years ago had a chevelle with a 4.10 and drove it all the time for years with no problem.
Kenneth

Larry Epperson · Bel Air Joined: 05 Dec 2006 Posts: 300 Location: Dallas

I am running 4:11 gears w/700R4 and at 70 MPH approx. 3000 RPM.

LDRollow · Posted: Wed Oct 24, 2007 10:03 am Post subject:

FWIW, my car has a 3.73 rear gear ratio and a 265-60X15 rear tires and a 700R4. In 3rd, one-to-one ratio, it will show 3000 RPM at 66 MPH. In overdrive, it will do 94 MPH also at 3000 RPM. I went to a chart on the internet and did calculations using a 4.10 rear gear, in 3rd at 3000 RPM the speed will be 60 MPH. in overdrive 3000 RPM will indicate 86 MPH. Several years ago, I towed a trailer with my '57 and kept it in 3rd as I did not want to lug the engine with the trailer in 4th, and drove it from Minnesota taching about 3300 RPM without any difficulties.