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Old July 6th, 2007, 11:21 AM   #1
milwaukeemud
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Question Help!! I dont know my gears!!??

Please someone help me!! I have a 1/2 ton 84 suburban with a 350 700-R4 tranny the problem is for some reason the metal id tages are missing from the diffs I would like to put a LSD is but I have no idea what my gearing is can someone help me? did truck diffs come with a LSD if it has one I can rebuild it My tires are 33x12.5x15 so I know that "changes" the ratio.thanks for the help
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Old July 6th, 2007, 11:48 AM   #2
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two ways possible: if the diffs. weren't changed from factory, you could use the VIN # and call the dealer. They would know.
Or you can remove the cover, and on the ring gear, there are two #'s. One # is the pinion teeth, and the other is the ring teeth . Just devide the two numbers and that is your gear ratio.
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Old July 6th, 2007, 11:54 AM   #3
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Tires don't change the ratio of the gears. Only the final drive ratio which is how much power (or lack of) your vehicle has.

burban44's is right. If you can't find the numbers, count the teeth & divide.
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Old July 6th, 2007, 12:05 PM   #4
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Originally Posted by milwaukeemud View Post
Please someone help me!! I have a 1/2 ton 84 suburban with a 350 700-R4 tranny the problem is for some reason the metal id tages are missing from the diffs I would like to put a LSD is but I have no idea what my gearing is can someone help me? did truck diffs come with a LSD if it has one I can rebuild it My tires are 33x12.5x15 so I know that "changes" the ratio.thanks for the help
put the tires on jack stands. Mark the driveshaft going to the axle. Spin the tire one complete revolution, and count how many times the driveshaft spins.

The gear ratio is nothing more then the driveshaft revolutions per 1 complete rotation of the tire.
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Old July 6th, 2007, 12:18 PM   #5
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put the TRUCK on jack stands. Mark the driveshaft going to the axle. Spin the tire one complete revolution, and count how many times the driveshaft spins.

The gear ratio is nothing more then the driveshaft revolutions per 1 complete rotation of the tire.
For some reason a tire on a jackstand likely cannot rotate.
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Old July 6th, 2007, 02:26 PM   #6
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You can also pull the covers and look at the # stamped in the ring gear.. Take the little #and divide it into the big number and that is your ratio..


example 41/12 = 3.41
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Old July 6th, 2007, 07:30 PM   #7
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on `84 vintage truck the gear tag was under the hood as a white sticker with a bunch of 3 digit codes(Called a "spid label"). if its still there it could have the codes like "GU2" which is 2:73's and the others are GU4 = 3:08, GU6 = 3:42, GT4 = 3:73, GT5 = 4:11, GT6 = 4:56. thats the lot of them. also if you scrap down the crud on the axle tube on the right side of the pig there is a code listed that is stamped into the top of the tube. its what the dealers use to I.D. axles on anything.

by the way the later models had the spid label in the glove box so it would hurt to look there.
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Old July 6th, 2007, 11:18 PM   #8
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cool thank's ill look for the numbers and see what I got.they got to be low I don't have much grunt off idle but that could be my motor anyway thanks for the help
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Old July 7th, 2007, 12:44 PM   #9
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can I give one of you guy's (or gal's) my VIN and you can help with my diff problem's I called chevy dealer's they can only go back to 89' or newer I looked for the stickers and ofcorse it's gone (my luck) I cant find the stamping on the tubes. Would the rear diff Gearing be the same as the front then?
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Old July 9th, 2007, 09:39 AM   #10
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Would the rear diff Gearing be the same as the front then?

I would hope that it would be, otherwise when you put in 4wd you would get some interseting things happening.
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Old July 9th, 2007, 11:54 AM   #11
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Quote:
Originally Posted by milwaukeemud View Post
can I give one of you guy's (or gal's) my VIN and you can help with my diff problem's I called chevy dealer's they can only go back to 89' or newer I looked for the stickers and ofcorse it's gone (my luck) I cant find the stamping on the tubes. Would the rear diff Gearing be the same as the front then?
yes, post your vin. I can tell you what it had when it was stock, but not what it has now.

unless you're 100% sure thier stock

but in all honesty, how hard is it to put a jack under the axle and spin the tires? This will answer your question in 30 seconds.
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Old July 9th, 2007, 11:57 AM   #12
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I would hope that it would be, otherwise when you put in 4wd you would get some interseting things happening.
Yes, the front and rear are the same

You should pop the cover off and change your gear oil... who knows the last time it has been changed?

Then while you're in there, you can be sure of the ratio.
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