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#1
08-08-2004, 10:28 AM
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Rear End Ratio?
Hi all,
Just bought a 2004 Trailblazer 4X4 with the 4.2L. Love the thing. I have the tow package but I can't figure out what rear end ratio I have. It's not on any of the information stickers. I got the numbers off the rear end. H231032441 is on the cover and 40035769 is stamped on the rear end where the drive shaft enters. Can anyone de-code these numbers or am I just not looking in the right place. I'm hoping I have the 4.10 for better towing or at least the 3.73. Thanks, mark 
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#2
08-08-2004, 09:05 PM
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Re: Rear End Ratio?
you have to find the RPO option for the gears. Then lok on your RPO list for which ever one matches.
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#4
08-11-2004, 11:11 AM
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Look here (http://www.gm-trucks.com/rpolists/20...railBlazer.txt) to decode the RPO's
The RPO's are located on a sticker in the glove box. C4D GVWR, 5550 lbs. (2517 kg) C5N GVWR, 5750 lbs. (2608 kg) G80 Differential, locking, heavy-duty, rear GT4 Rear axle, 3.73 ratio GT5 Rear axle, 4.10 ratio GU6 Rear axle, 3.42 ratio
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#5
08-11-2004, 07:36 PM
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Re: Rear End Ratio?
Thanks ZsTB. That really helped, I have the 3.42 rear end. GVWR is 5750 lbs. I'm going to be towing a car on a trailer. Total weight is going to be 4500lbs so I think I'll be fine. That 4.2 is really strong. Mark
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