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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Boone83K10 on January 30, 2013, 01:39:40 pm

Title: Axle Identification
Post by: Boone83K10 on January 30, 2013, 01:39:40 pm
I know that I can pop the cover off and read the ring gear, but haven't had time and the snow is coming tonight through Monday.

My axle tube is stamped with CWH G171 1

what is it? everything I read says that there should be two letters at the beginning which gives the axle ratio... I have 3 letters.

Help.
Title: Re: Axle Identification
Post by: pholliday1 on January 30, 2013, 01:47:45 pm
What is this on? Is it a Army CUCCV? The tag you are referring to with the axle ratio generally doesn't last past a few owners and on most Diffs the tag falls/ripped off. I believe the numbers you posted are axle tube numbers? If so those numbers don't usually indicate axle ratio as there are so many options.Give more specifics on your axle.
Title: Re: Axle Identification
Post by: Boone83K10 on January 30, 2013, 03:30:55 pm
RPO code of GQ1

83 K10

Corporate 10 bolt

'70 350 w/700r4 and NP208


I read online that the front passenger side of the rear axle is stamped. That it would reveal gear ratio, date made and something else I don't remember. Well I cleaned the entire axle with degreaser and rags and that was stamped on it. Everything says should start with two letters and mine has 3.

On the pumpkin there is GM 35 and F163. There is also a longer set of numbers but I can't remember them off the top of my head here at work.
Title: Re: Axle Identification
Post by: pholliday1 on January 30, 2013, 03:38:11 pm
Yea 30 years old..... pull the covers count the teeth then you'll know plus you can inspect the diff and change the fluid.
Title: Re: Axle Identification
Post by: gildardo01 on January 30, 2013, 03:51:39 pm
Quote from: pholliday1 on January 30, 2013, 03:38:11 pm
Yea 30 years old..... pull the covers count the teeth then you'll know plus you can inspect the diff and change the fluid.
i agree... and it only takes less than half an hour..
Title: Re: Axle Identification
Post by: Boone83K10 on January 30, 2013, 03:51:45 pm
True, question though. Manual says front axle takes 80w-90 GL-5 Gear Lubricant and rear axle takes 80w-90 Gear Oil. What's the difference?

sorry this is my first true 4x4 so I am new to the scene.
Title: Re: Axle Identification
Post by: gildardo01 on January 30, 2013, 05:23:44 pm
personally i use the same gear oil for the front as in the rear diff... and GL5 means how much sulpher-based friction modifier is in the oil in other words its supposed to be better in protecting wear and tare in the diff or gear box... btw donīt waste money on synthetic gear oil...
Title: Re: Axle Identification
Post by: Blazin on January 30, 2013, 07:00:22 pm
x2 on the same gear oil front and rear.
As far as gear ratio I have never heard of it being stamped on the tube. There is suposed to be a little sheet metal tag under one of the cover bolts that tell the ratio. As previously stated though the first time the cover comes off most dubs toss it!