What gear do I have? No codes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ky_kid · 10-04-2011, 12:53 PM

I am trying to figure out my rear end ratio with no luck. I think it needs steeper gears but I'm not sure where it's at now. I don't have any of the codes, they're gone from the glove box. I tried marking the tire and driveshaft but unless I'm crazy the driveshaft is only turning about 1.5 rotations to the tire's 1. So I have a 1.50:1 ratio?? HAHA I don't think so...

Any suggestions without taking the diff cover off?

f.monroe · 10-04-2011, 01:45 PM

3.08 would be my guess .If you have one tire stable and only turn one tire then you double the pinion rotation.
Frank.

ky_kid · 10-04-2011, 02:42 PM

That makes sense. I had both tires off the ground but I was only turning one.

LONGHAIR · 10-04-2011, 07:08 PM

Bite the bullet and take the cover off. The fluid needs to be changed anyway. The lube in the rear differential is one of the most neglected/abused things on nearly every vehicle.

ky_kid · 10-04-2011, 07:22 PM

That's a good point. I'm pretty sure I'm running 3.08's and I want something steeper so I will replace all bearings and fluids when I do it.

I have to change both the front and rear at the same time don't I? The gears I mean..

Keith Seymore · 10-04-2011, 08:38 PM

Quote:

Originally Posted by ky_kid

I have to change both the front and rear at the same time don't I? The gears I mean..

Yes.

K

rayfinseats · 10-04-2011, 11:24 PM

Take the cover off. The gears have the ratio stamped right on them. 41 11 or whatever.

10-04-2011, 12:53 PM	#1
ky_kid Registered User Join Date: Jul 2011 Location: Livingston, Montana Posts: 107	What gear do I have? No codes I am trying to figure out my rear end ratio with no luck. I think it needs steeper gears but I'm not sure where it's at now. I don't have any of the codes, they're gone from the glove box. I tried marking the tire and driveshaft but unless I'm crazy the driveshaft is only turning about 1.5 rotations to the tire's 1. So I have a 1.50:1 ratio?? HAHA I don't think so... Any suggestions without taking the diff cover off? __________________ 84 K10 Custom Deluxe: 350 crate engine w/ 4" lift

10-04-2011, 01:45 PM	#2
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: What gear do I have? No codes 3.08 would be my guess .If you have one tire stable and only turn one tire then you double the pinion rotation. Frank. __________________ Born and proudly residing in a Red State !

10-04-2011, 02:42 PM	#3
ky_kid Registered User Join Date: Jul 2011 Location: Livingston, Montana Posts: 107	Re: What gear do I have? No codes That makes sense. I had both tires off the ground but I was only turning one. __________________ 84 K10 Custom Deluxe: 350 crate engine w/ 4" lift

10-04-2011, 07:22 PM	#5
ky_kid Registered User Join Date: Jul 2011 Location: Livingston, Montana Posts: 107	Re: What gear do I have? No codes That's a good point. I'm pretty sure I'm running 3.08's and I want something steeper so I will replace all bearings and fluids when I do it. I have to change both the front and rear at the same time don't I? The gears I mean.. __________________ 84 K10 Custom Deluxe: 350 crate engine w/ 4" lift

10-04-2011, 11:24 PM	#7
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: What gear do I have? No codes Take the cover off. The gears have the ratio stamped right on them. 41 11 or whatever.



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