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Old 11-20-2008, 10:41 AM   #1 (permalink)
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Default Anyone have Gear Ratio/RPM Chart?

Hi I'm trying to determine what's a good rear gear ratio for my stock 289 w/T-10. I'm tired of my 2.80's and am looking for a little more performance.

A long time ago, I used to have link to a site that compared tire height, rear end gear ratios, and rpm's. Does anyone remember the site or have the link?

Also, what's a good rpm for extended freeway (75+ miles) driving for a stock 289? Thanks.
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Old 11-20-2008, 12:03 PM   #2 (permalink)
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I n my opinion it is a compromise.

My 65 with 3.25 and a toploader turned about 3,300 rpm at 75mph.

Now, with 3.80 gears and a TKO it turns about 2,700
at 75mph.

If you can handle the rev's then put the gears in otherwise I would suggest staying with what you have and simply building a comfortable cruiser.
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Old 11-20-2008, 12:24 PM   #3 (permalink)
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http://ultrastang.com/Page.asp?PageID=8

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Old 11-20-2008, 01:44 PM   #4 (permalink)
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http://www.bgsoflex.com/rpmrange.html


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Old 11-20-2008, 06:58 PM   #5 (permalink)
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Default Re: Anyone have Gear Ratio/RPM Chart?

Here's two of my favorites:
Gear Calculator Link

Another Gear Calculator Link

The first link is my favorite.
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Old 11-20-2008, 10:33 PM   #6 (permalink)
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Default Re: Anyone have Gear Ratio/RPM Chart?

Thanks for all the charts and advice, I really appreciate it.

Does anyone know a good cruising rpm range for a stock 289; a range that won't put undue stress on the motor/trans?
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Old 11-20-2008, 10:57 PM   #7 (permalink)
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I think it really depends on your definition of cruising rpm. With a 3.0 rear end and an AOD, Red cruises 1900 rpm at 70mph.

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Old 11-20-2008, 11:53 PM   #8 (permalink)
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Although it depends on the engine, I agree with Craig that around 2000+/- is a good number. Try driving at the RPM in top gear to see if the engine has enough torque to cruise in. By the way, I'd be interested in your 2.80's.

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Old 11-21-2008, 03:50 AM   #9 (permalink)
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under 3000 rpm. the less rpm the better.

When I had 3.89 gears I would drive for hours right at 3000 3500 rpm. In my view the engine wasn't straining, it was wearing out faster than I liked though.

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Old 11-21-2008, 06:47 AM   #10 (permalink)
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Default Re: Anyone have Gear Ratio/RPM Chart?

Quote:
Originally Posted by DEL65
Thanks for all the charts and advice, I really appreciate it.

Does anyone know a good cruising rpm range for a stock 289; a range that won't put undue stress on the motor/trans?
FWIW,
When I was trying to decide on rear gears, I just made up a spreadsheet that let me input tire size, gear ratios, and MPH and spat out RPM. Kinda fun to mess with.
I also tried to match my Gen 1 Lightning, which turns right handy at 2400 for 60 MPH, and IIRC about 3000 at 70. The 351 seems to like it well enough, and has 150K miles and still going strong.
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Old 11-21-2008, 09:12 AM   #11 (permalink)
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Don't bother with a 3.00. Not enough of a change to make a big difference.

If you rarely drive long distances then go 3.50. If you do then get 3.25.
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Old 11-21-2008, 10:46 AM   #12 (permalink)
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Here's the BFG Radial T/A tire chart, shows the revs per mile. They say @ 45, due to minor tire growth above that, but for your purposes, it's fine.

Revs per mile X rear axle ratio X transmission final drive ratio = engine speed @ 60MPH. If you want engine RPM at 75, multiply your answer by 1.25.

245/60R14 w/3.00 axle, 1:1 trans...

813 X 3 X 1 = 2439 rpms @ 60, 3049 rpm @ 75

Simple.
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Old 11-21-2008, 01:16 PM   #13 (permalink)
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Hemikiller, I see that you offer a copy of 65-72 MPC. What is an MPC?
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Old 11-21-2008, 06:46 PM   #14 (permalink)
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Thanks again for all the great info. I think 3.25 will be a great combo to fit my driving. Cheers!!
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Old 11-21-2008, 07:41 PM   #15 (permalink)
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Quote:
Originally Posted by 6T7
Hemikiller, I see that you offer a copy of 65-72 MPC. What is an MPC?
Ford Master Parts Catalog. It's the catalog the Ford dealer would have used to look up parts for your car. I have PDF copies of several volumes.
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