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11-17-2013, 10:55 AM
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#1 |
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Registered User
 
Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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Gear ratio ?
My 68 stepside has a 350 tranny. The rear end way to low for me. This truck could have been a 3 speed a few years back. Tacking about 3000 rpm's at about 60-65. My question is, Whats the ideal gear ratio I'm looking for ? The other question is, For a rear end change out (Simplest) what years am I looking for. I don't want to be cutting or welding mounts or perches ? Would I be better off having the ring & pinion Changed ?
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11-17-2013, 10:59 AM
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#2 |
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Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Gear ratio ?
How tall tires are your running?
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1970 C10 Short Stepper with 71/72 front clip. |
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11-17-2013, 11:09 AM
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#3 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Gear ratio ?
If the truck was originally a 3 speed OTT,it's probably equipped with q 3:73 gearset.For the auto,factory would have been a 3:08.Tires will make some difference and if the tranny's speedo output wasn't changed,your speedo is off.The easiest rear end swap is a 67-72 rear from a truck equipped with the gearing you want and sprung the way yours is.The later 71-72(and some 70 midyear up) rears are a little wider to match better with the disc brake front end.They mount the same.Tires can make a lot of difference but due to a computer crash I don't have a calculator but they are available on lots of tire and 4X4 sites.
My best advice on options is to either put in 3:08 gears and have stock rpms at a given speed or install an AOD tranny and get the best of both worlds.
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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11-17-2013, 11:57 AM
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#4 |
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Registered User
Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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Re: Gear ratio ?
Tire size is 285/50/18 about 28.5 Tall.
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11-17-2013, 12:24 PM
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#5 |
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Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Gear ratio ?
PanelDeland pretty much covered it.
__________________
1970 C10 Short Stepper with 71/72 front clip. |
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