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09-26-2010, 11:45 PM
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#1 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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Speedometer Gear
I need some help with speedo gears. This is on my '76 K10 that has an NP205 t-case. My truck currently has 31" tires on it and i will soon be putting 35's on it and i want my speedo to read right afterwards. I dont currently know the tooth count on the driven gear in the t-case, but there is a ratio adapter between the driven gear and the speedo cable. Do i just need to replace the ratio adapter? or do i need to keep the ratio adapter and replace the driven gear? And if i do need to just switch out the ratio adapter then how do i find out which one i need?
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB Last edited by BigRed76; 09-26-2010 at 11:48 PM. |
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09-27-2010, 10:34 AM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,277
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Re: Speedometer Gear
anyone or should we move this to transmissions?
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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09-27-2010, 10:50 AM
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#3 |
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Senior Member
 
Join Date: Jul 2009
Location: Hayden, Al.
Posts: 4,148
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Re: Speedometer Gear
First thing you really need to do is pull the speedo housing from the trans and see what tooth count the gear is and which speedo housing you have. The housing will either be a 34-39 housing or a 40-45 housing (it's actually stamped on the housing). Then you will have use a speedo calculator to figure out what gear you will need to correct you speedo. I use the one at http://www.transmissioncenter.org/GM...eter_Gears.htm ....They are pretty good to deal with too.
Good Luck! Ed |
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09-27-2010, 03:55 PM
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#4 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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Re: Speedometer Gear
I understand how it is with the automatics, but I'm just unsure of how it is with the manuals where the speedo gear is in the t-case.
Posted via Mobile Device
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
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09-27-2010, 06:26 PM
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#5 |
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Senior Member
Join Date: Jul 2009
Location: Hayden, Al.
Posts: 4,148
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Re: Speedometer Gear
It's the same on all of them. It's just moved further back is all. Check out that website I posted, they have tons of tech info about this stuff.
Ed |
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09-28-2010, 12:43 AM
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#6 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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Re: Speedometer Gear
Should we move this to the drivetrain section?
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
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09-28-2010, 10:28 PM
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#7 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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Re: Speedometer Gear
just givin it a bump...
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
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