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03-02-2004, 11:59 AM
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#1 |
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Registered User
Join Date: Jan 2004
Location: Garland TX Dallas area
Posts: 658
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What gears are you running
I am not sure what gears I have but I have a set of 3:73 I was thinking of using. I was talking to someone that has 3:73 and he said when he's going about 60 MPH he is turning about 3000 RPM. He has a 350 with a 350 trans I have a 396 with a 400 trans. I can run at 70 MPH and run at about 3000 this leads me to believe I may have 3:08 but again I am not sure what my gears are.
Can any of you guys out there tell me what RPM you are running at 60 MPH and what gears you have. |
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03-02-2004, 12:08 PM
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#2 |
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Registered User
Join Date: Apr 2001
Location: Lincoln, Nebraska
Posts: 587
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67 Chevy SWB - goal of a 1,000 hp weekend cruiser |
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03-02-2004, 12:09 PM
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#3 |
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Registered User
Join Date: Apr 2001
Location: Lincoln, Nebraska
Posts: 587
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sorry , i guess you need to be registered to that site. worth doing though. they have very good auto math calculators.
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67 Chevy SWB - goal of a 1,000 hp weekend cruiser |
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03-02-2004, 12:13 PM
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#4 |
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Senior Member
 
Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,374
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Hey Flip66...
My 70cst has a factory 402BB with the 400 tranny...the stock rear end was a 3:08 and I have installed a 3:41 (?) posi. I'm not sure what rev's I'm running. Next time I get her out I'll check out the RPM's. Regards, 70cst   
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03-02-2004, 12:20 PM
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#5 |
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Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,980
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Here is a site that may help.
http://richmondgear.com/streetcalculators.html I'm running 3.54 with 32.5" tires
__________________
BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , |
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03-02-2004, 12:32 PM
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#6 |
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Try spinnin 4 rear tars
Join Date: Sep 2003
Location: Salt Lake City, Utah
Posts: 757
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I have 3.08's from the factory and I'm turning 3g's at ~80.
Flip, your going too slow to have 3.08s, sounds more like 3.54 or (were 3.31's offered in these trucks?!?!  )
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SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB |
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03-02-2004, 12:34 PM
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#7 |
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Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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plug in the numbers and you should get a good idea..
http://www.angelfire.com/fl/procrastination/rear.html
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03-02-2004, 02:16 PM
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#8 |
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Registered User
Join Date: Jun 2001
Location: Eastern Kansas
Posts: 488
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In my '96 that has 3.42 ratio I am running about 2800 to 2900 RPM at 70 MPH when in drive. I am running 235/75/15 tires.
Randy
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'72 Cheyenne. AC, PS, PB, Rear slider window, tilt. Light yellow (grapefruit yellow according to new sales literature from '72) '56 Chevy short step V-8 (My dad bought it new!!) '70 Olds 442 convertible '70 Olds Rallye 350 |
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03-02-2004, 03:00 PM
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#9 |
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Registered User
Join Date: Jan 2004
Location: Garland TX Dallas area
Posts: 658
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Thanks guys I have to make sure on the RPM but it looks like they may 3:73 already.
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