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#1 |
Registered User
Join Date: Aug 2013
Location: Mahtomedi, Minnesota
Posts: 335
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68 rear gears
Okay, so I did some math and I found my 68 k10 has roughly a 3.97 rear gears using rough math, so I was wondering what 68a had for options for the rear gear ratios.
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: 68 rear gears
Rough math??
Tell us how you figured it out. 3.97 is pretty precise. You could have 3.73's, 4.10's or 4.56's in there. |
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#3 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: 68 rear gears
should be in the glove box door , rough math dont work , especially if its a non posi
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#4 |
Registered User
Join Date: Aug 2013
Location: Mahtomedi, Minnesota
Posts: 335
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Re: 68 rear gears
By rough math I mean I did slot of rounding it is probably a 4.10. I don't have the paper in the glove box, it has had a cab swap
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#5 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: 68 rear gears
Quote:
Series 10 Open Carrier 3.07=HB, LL, RA, TR, TT 3.73=HA, HJ, HQ, MF, TQ 4.11=HO, HP, JQ, MI, MK, Series 10 Positraction 3.73=HC, HN, MU, TU 4.11=HK, HL, HR, ME, MG, TS, TV There will be a number stamped on the upper surface of the axle tube (I think on the passenger side) that uses one of the letter codes above to identify ratio and open vs posi rear. All bets are off if someone has changed the carrier. |
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#6 |
Registered User
Join Date: Aug 2013
Location: Mahtomedi, Minnesota
Posts: 335
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Re: 68 rear gears
It's simple, my rpm at 55 is 2500, and I have 31 inch tires so you see how many rotations it takes your tires to go 55 miles, then take you RPMs and multiply it by 60 to get 55 miles per hour, so in my case I did a little more precise math this time and got 150000/36759 which ended up being 4.08 ration in fourth gear which is a 1:1 ratio
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#7 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: 68 rear gears
if you have a Manuel that might work , autos have converter slip
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#8 |
Registered User
Join Date: Aug 2013
Location: Mahtomedi, Minnesota
Posts: 335
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Re: 68 rear gears
It is a manual
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#9 |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: 68 rear gears
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#10 |
Registered User
Join Date: Mar 2013
Location: Marquette michigan
Posts: 828
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Re: 68 rear gears
Hi 1968K10 blue, take a bright colored crayon, mark the drive shaft to the nose of the rearend, and at the same time strike a mark straight down to the ground on the outside of the tire (at the 6 oclock position). After you have done this a few times it is very easy and has never been wrong. What i do is mark the drivers side of the driveshaft along the drivers side of the nose of the rearend so i can roll the drivers tire forward as i watch the tire and drive shaft, remember to have the truck steering straight ahead (not turning). An example is this, drivers tire makes exactly one revolution, as the drive shaft makes just past 4 full revolutions = 4.11 ratio. Ex #2 drive shaft turns just past 3 revolutions for 1 tire revolution = 3.08 etc, etc. Good luck, Brian F.
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