Torque within a usable range of speeds
 

I am new here but have become pretty involved in the 67-72 forum, but have a 66 gmc. On that board lots of folks are changing transmissions, rear ends, engines, and tire sizes and they were only looking at speed. I have built a set of excel spreadsheets that show most available engines, transmissions, rear axle ratios, and differing diameters of tires. What this lets you do is know how fast your vehicle will run and how much power it will have before making the change.........I use about 460ft/lbs of torque to the ground in OD gear as kind of a yard stick, and also shoot for 2000rpm cruising down the road at approximately 65mph. I am going to try and post one of these excel spreadsheets here so you can get an idea of the information that is available:


oh well that did not work, will try again:

Re: Torque within a usable range of speeds
 

will try again:

Attachment 1288




my computer shows this file has a virus and will not open it....????why did the forum not open the file ?

Re: Torque within a usable range of speeds
 

kieth I ran a virustotal check on both of your files and they both show up clean.

The first one is here https://www.virustotal.com/en/file/7...is/1394461904/

second one:
https://www.virustotal.com/en/file/a...is/1394461625/

Good info in them too. I think your computer just had a fit.

Re: Torque within a usable range of speeds
 

Great, it did work then, hope you guys can use the information, why does it not open up ?


If you guys need information for diameters for other than 29" just post up and I will post the file....for that diameter. If you need other transmissions just let me know and I will customize the information for your needs. Kieth

Re: Torque within a usable range of speeds
 

Sounds like you're a numbers guy! Im gonna keep that in mind when i start getting tires and such! :thumbsup:

when you say "why does it not open up" do you mean why isnt it showing up on your post as a picture? Its a pdf file so you have to download it and open it.

Re: Torque within a usable range of speeds
 

GUIDE LINES: since I finally got these spreadsheet to post up I am going to load up all the commom tire diameters (from the ground to the top of the rear tire in inches) Here we go, if you have questions after looking at your truck specifications on the spreadsheet just post up here and we will try to make sense out of the information:

1. torque and speed lines show which are 1:1 final drive also apply to the next gear down in a t5 or a 700r4.

2. Use 460 ft/lbs of torque as a guide line to how much a truck should have to cruise down the road in Over Drive, much lower than that and the truck will fall on its face.

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Re: Torque within a usable range of speeds
 

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here are the last 3......................hope this helps...........................Kieth :goodluck:

Re: Torque within a usable range of speeds
 

Numbers was my nickname when I sold class 8 trucks and later when I started my own class 8 used truck dealership. I originally developed the concept of torque within a usable range of speed in the 80's when speed limits started to change every 6 months from 55mph to 75mph, tire sizes started changing, transmissions, and engines. I had a hard time trying to figure out what made a truck pull good and get good fuel mileage. Went back to my old sales engineering days (speed reducers, winches, and planetary track drives, mixed up a bunch formulas, and printed out a 8" thick notebook that showed all engines, transmissions, rear axle ratios, and tire sizes in a format that allowed one to quickly decide what to try and with the torque numbers what would actually work in the real world.......so "numbers" is appropriate. Kieth

Re: Torque within a usable range of speeds
 

thanks for this

Re: Torque within a usable range of speeds
 

Here is one for 33" tire diameter:
Attachment 1307