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Old 01-23-2012, 02:55 PM   #1
Dave51
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gear ratio ?

Hi

Would anyone know what rear end gear ratios were offered for 3/4 ton chevys?


Mine is an 79, 350 with 4 10's. Would like something more hwy/gas friendly.
All I have ever seen are 3 73's, and they are not exactly plentyful in this neck of the woods.

Thanks, Dave
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Old 01-23-2012, 05:51 PM   #2
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Re: gear ratio ?

i think for 79 you only had 3 choices---3.21, 3.73 and 4.10.

If this is the 14bolt full floater then the aftermarket doesn't look much better.
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Old 01-24-2012, 12:04 AM   #3
Dave51
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Re: gear ratio ?

Thanksc-10 for the reply.

I think I have a 10 bolt Dana if I'm not mistaken.
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Old 01-24-2012, 12:22 AM   #4
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Re: gear ratio ?

Not sure what a 10 bolt dana is?

How many bolts do you have on the diff cover?
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Old 01-24-2012, 07:36 AM   #5
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Re: gear ratio ?

2wd? 4WD? 10 1/2 full floater, or 9 1/2 semi? Corporate or dana front if 4wd?
my 81 3/4 2wd has a 9 1/2 semi floater and has 3.42 gears. They made a 3.23 (rare), 3.73's and 4.11 from the factory for this rear.
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Old 01-25-2012, 12:07 PM   #6
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Re: gear ratio ?

Can you take a picture of the rear diff cover?
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Old 01-25-2012, 08:21 PM   #7
frydaddys87
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Re: gear ratio ?

if you have a 10 bolt ill happily trade you mt 307s for your 410s lol
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Old 01-25-2012, 09:03 PM   #8
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Re: gear ratio ?

i have a 14 bolt corporate 4:10...with a 454....i need to get a gear vendor...
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