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Gear ratio for a 9 inch

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cole63

Number of posts : 89
Location : GA
Registration date : 2013-05-19

Gear ratio for a 9 inch

Post by cole63 on Sat Feb 11, 2017 5:11 am

My van is running a fresh 300 engine and 3.50 gears out back. I have plenty of power, but I want to take some long trips and would like to knock down my highway rpms. My question is, will a set of 3.00 gears be too high? I don't mind losing a little take off in exchange for faster highway speeds and lower cruising rpms.
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1646
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Gear ratio for a 9 inch

Post by Seth G on Sat Feb 11, 2017 9:23 am

What is your wheel size? Assuming you have a 25.5" wheel, @ 65 mph you will be spinning around 2700 w/ 3:1 gears.

A 2.7:1 gear would take that to around 2450. Right now you are running around 3150 @ 65

3:1 may be a good compromise, but if long range cruising is the plan the 2.7 gear maybe the best for highway and fuel economy. Also you could keep the 3.5 3rd member, and swap in a 2.7 member when you are going to take a long road trip.

http://www.grimmjeeper.com/gears.html
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cole63

Number of posts : 89
Location : GA
Registration date : 2013-05-19

Re: Gear ratio for a 9 inch

Post by cole63 on Sat Feb 11, 2017 10:28 am

I'm at 26.5 with 295/50 15 right now.
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1646
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Gear ratio for a 9 inch

Post by Seth G on Sun Feb 12, 2017 9:52 pm

26.5" would drop those numbers above a bit.
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cole63

Number of posts : 89
Location : GA
Registration date : 2013-05-19

Re: Gear ratio for a 9 inch

Post by cole63 on Tue Feb 14, 2017 9:43 am

Thanks. Seth. I think ill look for a 3.00 ratio for a good balance of acceleration and cruising.
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FIZGIG

Number of posts : 332
Location : Lynnwood, WA
Registration date : 2014-01-23

Re: Gear ratio for a 9 inch

Post by FIZGIG on Wed Feb 15, 2017 7:30 am

I had 3.00's in my truck when I bought it and I drove it up from Orange County just fine but I put in 3.55's and they seem to work just great.
You cant go wrong with the 3.00
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Wolfster

Number of posts : 91
Location : Omaha, Ne
Registration date : 2016-08-27

Re: Gear ratio for a 9 inch

Post by Wolfster on Wed Feb 15, 2017 10:53 am

Mine has 3.00 and I'll be running a C4 with a 302. Not really into fast acceleration off the line at my age, just want a nice cruiser. 9" gears are easy to change if I end up going through another childhood/midlife crises.
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cole63

Number of posts : 89
Location : GA
Registration date : 2013-05-19

Re: Gear ratio for a 9 inch

Post by cole63 on Wed Feb 15, 2017 5:35 pm

Thanks guys, I'm on the lookout for a 3.00 center section.

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