where in the world is the specs sticker to find gear ratio

hddave1

where do i look to find what rear end gear ratio..i've looked in glove box and behind the seat and cant find a specs sticker...can some one tell where to look..its a 85 elky...thanks
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1985 el camino 350 sbc crate th350 trans with shift kit

Hansmanbo · Posted: Sun Mar 16, 2008 12:47 pm Post subject:

Code will be stamped on front side of axle tube, passenger side. Post code and we can tell you what you have. Secondly you can count number of teeth on your ring divided by number of teeth on your pinion to give you your ratio.
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York SC /1979 GMC Caballero / 350 Roller / Alum Heads / 410 posi

87ElCamino · Posted: Sun Mar 16, 2008 12:51 pm Post subject:

If you don't have an options sticker inside the glove box you can crawl underneath the rear axle and get the code from the axle tube. Read this thread.

http://elcaminocentral.com/ftopict-11474.html
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Ernie
87 El Camino
Rolling Eyes

"To be Old and Wise, you must first be Young and Stupid"

Hansmanbo · Posted: Sun Mar 16, 2008 12:53 pm Post subject:

Isn't that what I said? Banghead

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York SC /1979 GMC Caballero / 350 Roller / Alum Heads / 410 posi

K5Cruiser · Posted: Sun Mar 16, 2008 1:06 pm Post subject:

Here's another option for you to figure out what gear ratio you have. I had posted this on another site that is primarily truck based, so the gear ratio number examples are a little higher (numerically). This also helps because the code on the axle may not necessarily match the rear end gears if a gear swap was done some time in the past.

If you don't want to pull the cover and end up having to put in new gear oil, do the following:
- Jack up the rear end so the tires are not touching the ground and place some jackstands under the rear axle housing, make sure the front wheels are blocked / chocked before you jack it up.
- Release the parking brake and place the transmission in neutral.
- Mark the driveshaft with some of your wife's favorite nail polish, or some tape will work also.
- Now rotate the rear tire by hand one full 360 degree turn. While doing that count the number of times the mark on the driveshaft turns around.

If you count 3 and 3/4 turns, you probably have 3.73 gears. If you count just over 4 turns, you probably have 4.10 gears. I'm sure you get the idea by now.

hddave1 · Posted: Sun Mar 16, 2008 8:08 pm Post subject:

well i crawled under car and looked but didnt see any number so im going to get a wire brush try cleaning it up to see...if not i'll raise the car and count the drive shaft turns.. im wanting to see what i have so i can determin what lower gear im going to get to help my new 350 move this 3800lbs car without me having to mash the peddle so hard..lol..i was told on another forum that if i had 2.41 ratio i would benafit in a gear change with the 350 setup i have ...
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1985 el camino 350 sbc crate th350 trans with shift kit

dougs85 · Posted: Sun Mar 16, 2008 8:56 pm Post subject:

Yeah, you have to wire brush the crap out of the axle tube to reveal the codes.

Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO

87ElCamino · Posted: Mon Mar 17, 2008 4:24 am Post subject:

87ElCamino · Posted: Mon Mar 17, 2008 4:27 am Post subject:

GerryP · Posted: Mon Mar 17, 2008 9:50 pm Post subject:

85 Cab with 305 = 3252 lbs
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1971 GMC Sprint (His)
1981 El Camino SS (Hers)

Steve81OR · Posted: Mon Apr 14, 2008 10:15 am Post subject:

On my '81 I found the factory build sheet inside the upper door panel. I was told there may be another one above the headliner and/or gas tank. Not sure if an '85 will be the same, but it's a place to start.
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1981 Chevy El Camino
1991 Chevy S10
"The only thing collecting dust in my garage... is my broom"