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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Rear Drivelines, Drive Axles and Gearing => Topic started by: 81Cheyenne on September 01, 2007, 10:06:53 am

Title: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 01, 2007, 10:06:53 am: Does anybody know what the actual ratio is of this rear end?
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: VileZambonie on September 01, 2007, 02:15:53 pm: I thought GQ1 meant regular open differential but I could be wrong. Any other codes? If not you 'll need to pop the cover off to find out.
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 01, 2007, 02:50:33 pm: Nope. No other codes. At least not on the glove box sticker. All it says is: "GQ1 - Rear Axle - Standard".
How do I determine the ratio after pulling the cover?
thanks.
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: zieg85 on September 01, 2007, 03:26:49 pm: You sent me a PM on doors, your mailbox is full and your e-mail is hidden. Contact me via my e-mail in my profile.
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: zieg85 on September 01, 2007, 03:28:37 pm: Quote from: 81Cheyenne on September 01, 2007, 02:50:33 pm
Nope. No other codes. At least not on the glove box sticker. All it says is: "GQ1 - Rear Axle - Standard".
How do I determine the ratio after pulling the cover?
thanks.

You will see 2 numbers on the outside of the ring gear, divide them and that is what you have. IE 43/13 3.31
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 01, 2007, 03:42:58 pm: Thanks Zeig.
Looks like your box is full too. I emptied mine but in case it doesn't work:
psdisme@hotmail.com
thanks!
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: zieg85 on September 01, 2007, 03:54:52 pm: Quote from: 81Cheyenne on September 01, 2007, 03:42:58 pm
Thanks Zeig.
Looks like your box is full too. I emptied mine but in case it doesn't work:
psdisme@hotmail.com
thanks!

Sent you an e-mail and PM. I guess 1 message and it is full???
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 02, 2007, 07:38:52 am: Quote from: zieg85 on September 01, 2007, 03:54:52 pm
Sent you an e-mail and PM. I guess 1 message and it is full???

Got your email. Looks like 1 message fills up the box.
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 03, 2007, 03:11:18 pm: Ok, I followed a link to a site that has reprints of the original Chevy truck flyers. Looks like the standard ratio axle for a C10 in 1981 is 2.73. Does that sound about right?
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: VileZambonie on September 03, 2007, 07:17:42 pm: Is it a 10 or 12 bolt? Most of the 12 bolts were 2.73 or 3.07. The 10 bolts were usually 3.08 or 3.42
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: 81Cheyenne on September 04, 2007, 10:01:16 am: Quote from: VileZambonie on September 03, 2007, 07:17:42 pm
Is it a 10 or 12 bolt? Most of the 12 bolts were 2.73 or 3.07. The 10 bolts were usually 3.08 or 3.42

It's a 10 bolt. Hey, do you think that a 10 bolt will be strong enough for a slide in or pull behind camper?
Title: Re: GQ1 Rear Axle - Standard Ratio?
Post by: zieg85 on September 04, 2007, 04:59:43 pm: You should be ok if you don't exceed the GCVW rating. I suspect with the leaf stack in your other post you have the lighter duty braking with the thinner rotors. Beefing up the springs doesn't change the rest just that it will handle the load better. I used to tow my car trailer with my old 82 with a worn out 305 and 3.08 rear end. It didn't do to bad.