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05-29-2016, 10:55 PM
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#1 |
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Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Gear ratio speed question
Got a quick gear ratio question.
I have a '61 GMC 5000 with a NP540 trans (direct drive in 5th) and split rear. 9.00-20 tires. Right now I top out at 35-40ishmph, 30mph cruising comfortably. My gears in the differential are 6.50HI and 9.04LOW. Is this speed about right for what I have in my truck? Anyone have one similar? I realize it's old and all but it would be great to get at least 45mph, but I think that's going to take some serious gear changing to do. Any help would be appreciated.... |
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06-04-2016, 11:59 PM
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#2 |
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Registered User
Join Date: Jul 2011
Location: WV
Posts: 946
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Re: Gear ratio speed question
Jake, check your 2 speed. Sounds like it's in low range.
__________________
72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold  70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD |
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06-05-2016, 09:29 PM
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#3 | |
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Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 496
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Re: Gear ratio speed question
Quote:
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06-06-2016, 09:49 AM
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#4 |
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Registered User
Join Date: Jul 2007
Location: Alaska
Posts: 517
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Re: Gear ratio speed question
I would have to agree....I have a '75. 7500 (two of them actually) with 9.00x20's and 5 speeds... .One with the 6.xx or 8.xx two speed one with and undetermined single speed axle and the top out around 48- 50 mph .....Though both of mine are Detroit powered and tact out at 2800....slower than that would almost HAVE to be either "low range" or truely "deep" rear end gearing.
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