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Old 04-07-2011, 01:58 AM   #1
Beat68CST
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Guys with 3.73's

What MPH do you run on the highway at what RPM?
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Old 04-07-2011, 02:05 AM   #2
Nova70
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Re: Guys with 3.73's

I have 3.73's with 35's and I turn about 70mph at 2200rpm.
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Old 04-07-2011, 07:09 AM   #3
Hottrucks
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Re: Guys with 3.73's

to much!! I have a BB caddy which hates RPM at 70ish I'm turning about 3000 on a stock tire

you can google your set up theres a few online programs try this

http://www.ringpinion.com/Calc_RPM.aspx
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Old 04-07-2011, 07:11 AM   #4
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Re: Guys with 3.73's

3106 auto
3025 manual
2118 overdrive
2420 with a 5 speed

on a 29" tire

Last edited by Hottrucks; 04-07-2011 at 07:12 AM.
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Old 04-07-2011, 07:42 AM   #5
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Re: Guys with 3.73's

about 3200rpm at 70 on a 28" tire
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Old 04-07-2011, 07:55 AM   #6
Todd68Chevy
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Re: Guys with 3.73's

283 cid 3 speed manual (still 1 to 1 high gear) 3.73 rear end, 283s do not mind rpm's

With 235/70r15 tires I was running 3000 rpm at 60mph (Ran great but Loved fuel)

with 255/70r15 tires I was running 2800 rpm at 60mph (Ran great but still Loved fuel)

now with 3.08 gears and 255/70r15 tires I am running 2200 rpm at 60 (seems like less power but hope it likes fuel less)

Just put gas in it yesterday at $3.99 a gallon
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I currently own: 1940 Chevy Fire truck (project), 1946 Chevy truck (project), 1946 Chevy 1 Ton pick up, 1953 Chevy school bus (storage area), 1968 Chevy C10 (I have drove for 26 years), 1994 Chevy C2500 (daily driver), 2005 GMC crew cab K2500 (parts hauler) and more trucks for parts.
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Old 04-07-2011, 07:59 AM   #7
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Re: Guys with 3.73's

yea I plan on the 3:08's it will make for a Happy Caddy @ 2200 power isnt an issue...lol
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Old 04-07-2011, 10:10 AM   #8
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Re: Guys with 3.73's

Thanks guys!

I have an old Small Journal 327 so I'm not tooo worried about RPM

Right now I have 4.56's but lookin to put an overdrive setup on it, Gear Vendor's site says it'd put my final at about 3.56, and after the info you guys gave me, hopefully I can run 75 around 2500rpm or so.
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Old 04-07-2011, 10:05 AM   #9
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Re: Guys with 3.73's

IDK but it screams lol! Dont bother me tho I swapped from 3.08s to 3.73 posi and couldnt be happier. my truck has a TH400 in it right now but i believe that im gunna swap to a 700R4 after i have my fun abusing the TH400.
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Old 04-07-2011, 11:15 AM   #10
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Re: Guys with 3.73's

I run at about 2000rpm at 65 with my 3.73 rear and 700r4. Average mpg has been about 16-17.
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Old 04-07-2011, 01:44 PM   #11
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Re: Guys with 3.73's

I took out 308's for the 373's when I had my 327...it was a pig..the 373's work well with that motor??(not so much the BB)..unless you do alot of highway travel I would think about spending the ching......I think you would like the 200 or 700 trans with OD more and it will set you back less...but thats just MAO??
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Old 04-07-2011, 02:31 PM   #12
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Re: Guys with 3.73's

327's are rpm monsters don't worry about that
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Old 04-07-2011, 04:48 PM   #13
6772owner
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Re: Guys with 3.73's

My 72' runs about 2,000 RPM @ 65MPH w/the 700R4 and 29" tires (255/55/18) I think I have 3.73's
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Old 04-07-2011, 05:51 PM   #14
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Re: Guys with 3.73's

Forgot to add I have a TH350.
Posted via Mobile Device
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Old 04-07-2011, 10:58 PM   #15
Beat68CST
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Re: Guys with 3.73's

well I know my old 327 saw somewhere around 6,500. Bein that my dad used to bracket race the truck and went through the speed traps at about 95mph ET'in at like 15.70's lmao.
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Old 04-10-2011, 03:11 AM   #16
gonzo6869
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Re: Guys with 3.73's

@60MPH I am at about 2850RPM w/275/60/15 tires.
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Old 04-10-2011, 11:07 AM   #17
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Re: Guys with 3.73's

700r4, 3.73 gears, 31" tires, runnin' 2000 RPMs @ 70 MPH
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