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10-27-2014, 07:06 PM
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#1 |
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Gripnrip
Join Date: Nov 2008
Location: richmond utah
Posts: 63
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gear ratio
I'm checking the gear ratios on all of my trucks and wondering if anyone has heard of a 439 ratio. The truck in question is an 81 gmc 3/4 longbed 2 wheel. Had a factory diesel. When I count the ring I get 41, and when I count the pinion I get 18. I have never heard of 439 ratio and can't find reference to it anywhere. Any ideas?
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10-27-2014, 07:52 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,538
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Re: gear ratio
41 divided by 18 equals 2.29.
Count it again or just look on the ring gear. It's stamped on there. |
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10-27-2014, 08:18 PM
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#3 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: gear ratio
Whoa, Time warp. Thought I was browsing the 67-72 side when I first read this.
Careful on the multi posting of the same question. What geezer#99 posted...
__________________
'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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10-27-2014, 08:19 PM
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#4 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,578
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Re: gear ratio
Would 2.29 be a real ratio. The lowest I ever seen was 2.43
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11-03-2014, 04:05 AM
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#5 |
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Gripnrip
Join Date: Nov 2008
Location: richmond utah
Posts: 63
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Re: gear ratio
Checking to see where I get the best response and quality of reply's. Thanks for the help.
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11-03-2014, 09:58 AM
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#6 |
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Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 965
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Re: gear ratio
there is a 2.21 or something ratio. they are unusual to find.
__________________
88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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11-03-2014, 10:07 AM
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#7 |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,689
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Re: gear ratio
It's a 2:73. That was the standard ratio with the Olds diesel. 1981 was the last year. The only other ratio you could get with a diesel was 3:40.
Also, does that truck still have the diesel badges on it? I have never seen the '81 diesel badges and would love a pic if you have one.
__________________
78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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