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01-11-2008, 05:21 PM
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#1 |
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turbo enthusiast
Join Date: Jan 2004
Location: carmichael, ca.
Posts: 1,826
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gear and tire combo
I'm running 37 inch tires, 4.56 gears on my '67 burb with a 250 under the hood and a 4 speed trans. It seems to be under powered around town but the motor seems to wind out at 55 on the freeway. Does this sound normal?
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"But daddy, I didn't hit them all with a stick"...what my 6 year old tells me when I pick him up from school early for fighting  "
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01-11-2008, 09:13 PM
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#2 |
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Registered User
Join Date: Jan 2006
Location: So. NV.
Posts: 154
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Re: gear and tire combo
Yeah, I've got 37s and a four speed in my '66 Burb and it winds out pretty good on the freeway with 4.11s. Here's a calculator to figure out your rpm. http://www.ringpinion.com/Calc_RPM.aspx
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‘66 Suburban 4x4 LQ4/4L80e Dana 60’s ‘67 Camaro RS/SS convertible 350/700r4 ‘74 K10 Stepside 402/TH350 |
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01-12-2008, 05:08 AM
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#3 |
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Registered User
Join Date: Feb 2000
Location: Modesto, CA
Posts: 1,842
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Re: gear and tire combo
Toss a 454 in there and you'll be fine
 4:56s are not that hwy friendly 
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1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks
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01-12-2008, 05:51 PM
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#4 |
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Registered User
Join Date: Aug 2006
Location: Reno, NV
Posts: 346
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Re: gear and tire combo
Do you mean "wound out" like won't excelerate anymore, or is revved way to high? Cause you should only be at about 2300 rpm at that speed, which is nothing.
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1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc. |
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01-13-2008, 12:53 AM
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#5 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: gear and tire combo
We`re all used to hearing rpms from overdrive equipped vehicles on the highway.I roll @ 3,000-3,200 rpm all the time.
I think the 250/37s/4.56 combo should run about how you say it is.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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01-13-2008, 02:56 AM
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#6 | |
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Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,537
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Re: gear and tire combo
Quote:
That will get me to around 1800rpm w/37's or about 1900rpms w/36's @ 65mph. |
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01-13-2008, 04:09 AM
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#7 |
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Everything is work in progress
 
Join Date: Apr 2006
Location: Denver Colorado
Posts: 326
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Re: gear and tire combo
Drop in a NV4500, and get a bottle, problem solved.
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Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome Last edited by cobinder; 01-13-2008 at 04:10 AM. |
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01-13-2008, 08:38 AM
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#8 |
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turbo enthusiast
Join Date: Jan 2004
Location: carmichael, ca.
Posts: 1,826
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Re: gear and tire combo
thanks guys for all the help and info. Heres a pic of the beast!
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"But daddy, I didn't hit them all with a stick"...what my 6 year old tells me when I pick him up from school early for fighting "
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01-13-2008, 10:13 PM
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#9 |
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Senior Member
Join Date: Dec 2003
Location: Kingsport TN
Posts: 4,641
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Re: gear and tire combo
My 68 sounded like it was coming apart at 55 MPH but i tihnk it is do to the rock well transfer case more then gears. Im swithing to a 205 and nv4500.
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Earl 68 2500 4x4 GMC Burb |
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