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Re: [oletrucks] Gear Ratio wisdom sought

To: "Connie Dodd" <cwdodd1@home.com>,
Subject: Re: [oletrucks] Gear Ratio wisdom sought
From: "Jays Mail" <jaybaker@ruralnetwork.net>
Date: Sat, 16 Dec 2000 09:12:17 -0700
does any body know if the rearend gears from a 54 chevy wagon will
enterchange with a 38 or 41 1/2 ton rear end gears they should be 3.70 and
would be a cheap upgrade as I already have the parts? 54 was a transition
year for chevy so I'm not shure what will work with what? maybe patricks
would know? any old timers still on the list?
-----Original Message-----
From: Connie Dodd <cwdodd1@home.com>
To: BORDER,RYAN (HP-FtCollins,ex1) <ryan_border@hp.com>;
oletrucks@autox.team.net <oletrucks@autox.team.net>
Date: Friday, December 15, 2000 5:50 PM
Subject: Re: [oletrucks] Gear Ratio wisdom sought


>Where can you get a new ring and pinion for $100 ?????
>
>C W Dodd
>56-3200
>Greenville SC
>
>
>
>----- Original Message -----
>From: "BORDER,RYAN (HP-FtCollins,ex1)" <ryan_border@hp.com>
>To: <oletrucks@autox.team.net>
>Sent: Friday, December 15, 2000 3:48 PM
>Subject: [oletrucks] Gear Ratio wisdom sought
>
>
>> In brief, I need to select the gear ratio for my rear axle, and am hoping
>to
>> tap some of your collective wisdom.
>>
>> 55 Task Force
>> Mildly tweaked 350cid (Headers, Manifold, Cam, etc.)
>> TH-350 3spd tranny, 1:1 3rd gear
>> Building for 30.9" Diameter rear tires
>>
>> Churning my calculator, I've come up with a magic number of 761.5: to
>> convert a Gear Ratio to 70mph engine rpm's.  For instance, 3.50 gears
>should
>> give me (3.5*761.5) 2665rpm at 70mph.
>>
>> Now, I just need to figure out what I'd like my highway cruising rpm to
>be,
>> and I'll be ready to buy a ring and pinion.
>>
>> One one hand, a low gear ratio would definitely be a benefit at cruising
>> speed.
>> On the other hand, the truck will see a lot more in-town use than highway
>> use, and just for grins, it would be nice to have a little snap off the
>> line.
>>
>> Yeah, I know, in the perfect world I'd change to a 4-speed overdrive
>tranny
>> and have the best of both worlds ;-).  Then again, I could also put a
>blown
>> big-block in it... in either case, if I one day decide to persue either
of
>> those options, I'll probably be able to spend $100 on a new ring and
>pinion
>> gear to match.  So, for now, I'm focusing on how to optimize for what I
>> have.
>>
>> Given my setup, what would you guys recommend as a good compromise?  Some
>> possible alternatives:
>>
>> ratio 70mph
>> 2.50 1900rpm What my rear end has in it now
>> 3.00 2280rpm
>> 3.25 2475rpm
>> 3.50 2665rpm Common F-150 ratio
>> 4.11 3129rpm Conventional street/strip gears
>>
>> What would you do??
>>
>> Ryan.
>> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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