How much difference from 4.73 to 4.42??

How much difference from 4.73 to 4.42??

Postby swharris [OP] » August 4th 2013, 12:44am

So I found a good rear end for a reasonable price from a '99 today to replace the cracked one in my '97 Astro. All I had to do was remove the u-joint and out she rolled as someone before me had taken the springs.

Unfortunately, it's a GU6 as I could not find a GT4 today like originally came with the '97. I can return it if need be, but don't want to, if the difference in ratios is not that big a deal. I'm not too concerned with the speedo difference, just that the van will be able to pull the taller gear. This motor has a well maintained 280k miles on it btw. I guess my mileage may go up with the taller gear....
:banana: .

Any issues deal breaker issues I should know about before I throw it in?
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Re: How much difference from 4.73 to 4.42??

Postby Corsemoto » August 4th 2013, 12:56am

3.73 and 3.42

Can use the transmission and gear calculator chart here: http://www.ringpinion.com/Calculators/Calc_RPM.aspx
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Re: How much difference from 4.73 to 4.42??

Postby chevymaher » August 4th 2013, 1:51am

It will be 5 MPH off @65 MPH.
You will be doing 5 MPH than the speedo says.

Exactly the opposite of what I got going on. Same 2 gears I went the other direction.
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Re: How much difference from 4.73 to 4.42??

Postby swharris [OP] » August 5th 2013, 8:23pm

Think there be any issues in the motor pulling that slightly taller gear?
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Re: How much difference from 4.73 to 4.42??

Postby chevymaher » August 5th 2013, 8:30pm

Most vans have that gear factory.
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Re: How much difference from 4.73 to 4.42??

Postby xit » August 5th 2013, 8:42pm

Mine came with 3.42 gears but it is a 1994
Possibly Natures most perfect food, good beef jerky and cold beer......
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