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Tractor Talk Discussion Forum

1989 K3500 rear end ratio

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Rick Kr

10-29-2007 06:27:38




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I know there are a lot of truck people on here some hopefully someone can help.

Just got this for a farm truck. K3500 reg. cab 454, TH400, 4WD.

Main use will be short trips and hopefully a small gooseneck trailer in the future.

My question is
RPO shows GQ1 = Standard Ratio, GU6 = 3.42:1.
Did GM builds 1 tons with 3.42s?? I was hoping for a 4.11 or 4.56.

The rear cover has a small leak so it is coming off anyway, then I'll count teeth to be sure.

Thanks in adavance,
Rick

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jdemaris

10-29-2007 07:18:58




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 Re: 1989 K3500 rear end ratio in reply to Rick Kr, 10-29-2007 06:27:38  
Some of the GM corporate HD axles are not available with that ratio - but the 1 ton truck is available with the Dana full-floating 9 3/4 and 10" axles, Chevy 10 1/2" full-floating, and also the Rockwell 12" full-floating. The Dana and Rockwells do have the 3.42 option and usually have an extra RPO code of "Y" something.
All you need to do to check is get one wheel off the ground - put the trans in neutral - spin and count the turns. Look to see how far the driveshaft turns to make the wheel turn once. If the ratio is 3.42 - the driveshaft will turn about 1 3/4 turns to 1 turn of the wheel. Exception is if you have a posi and cannot turn one wheel with the other on the ground. If so, jack both up and then - for a 3.42 -the driveshaft will turn 3.42 turns to one turn of the wheels. A truck with a small-block engine and such gearing with a TH400 would have trouble getting started on steep hills with a heavy trailer behind it - unless it's 4WD with a low-range available. But, with a 454 and a matching torque-converter - it's probably not a problem with the high gearing. I've done a lot of towing with 3.08 axles against a TH400 - but have to put the transfer-case into low-range to get started up steep hills with a load.

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