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Old 02-07-2010, 07:28 AM
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Differential info

Does anyone here know the standard GM differential ratio for an 84 Chevy van with 350 and 700r4 transmission? This is a work in progress

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Old 02-07-2010, 09:15 AM
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The 3.42 was a popular ration in trucks with overdrive. Find the RPO sticker and look up the code. It will probably be in the bottom of the glove box. It's a white sticker with a bunch of 3 digit codes on it. The rear end codes start with a G. GU6 is a 3.42 and GT4 is a 3.73. Post the code and someone can tell you wnat it is. If you have the G80 code then you also have the Governor Lock differential.
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Old 02-07-2010, 03:13 PM
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Thanks BGH. It originally had a 305 with a 400 trans. The code sticker is no longer there. The differential seems a little high for it
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Old 02-07-2010, 06:47 PM
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My '84 Chevy Long 4x4 Heavy 1/2 ton Truck has a 305 with a 4-speed granny trans and it has 3.73 gears. A friends '86 Suburban was 350 w/700r4 OD and 3.42 rear.
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Old 02-07-2010, 06:49 PM
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I guess there is only one thing to do. Remove the cover and count the teeth on the geras and do the math. The oil probably needs to be changed anyway.
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Old 02-07-2010, 09:08 PM
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Thanks for the info. You help is appreciated. I guess the gear oil does need changin.
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Old 02-07-2010, 09:10 PM
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I'm not sure about the Chevy van but I know for a fact all G bodies - Monte carlo, Grand National, Elcamino, Malibu, Grand Prix ect have numbers stamped on the axle housing. Those numbers are easily googled, it will tell you the manufacturing date, whether it's limited or open differencial and the ratio. Usually they are toward the "front" of the housing on the passenger side; close to where you would fill it up.
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