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Private
ratio formula question
I am thinking of making my truck more streetable but can't remember the formula for figuring desired gear ratio. I have read alot hear about y'all going to 4.56 gears and am wondering if this is the only replacement for stock axles or just what everyone uses so as not to give up too much gearing?
Das Fire Führer!
To my knowledge, it is the only option for our stock axles, also the same gearing as the popular CUCV axle upgrade.
Randy's ring and pinion has ratio calculators online...engine speed with various ratios and tire sizes.
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Private
Thanks Doug. I'll check it out but do you happen to know what is the highest safe rpm for the np200?
Das Fire Führer!
I'll gaurantee no damage to the t-case at 0 rpm
Nah, seriously, for extended runs you're going to want to keep it below 3,000...more like 2,700 IMO.
Everyone has different experiences in this area, but 2,700 should be fine...3,000 for more than an hour and you're really pushing it, if not past it.
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Chief 9-flats
Just to be safe, consider 3000 t-case rpm as the short term red line for the NP200. Think 2300-2500 as the 20+ mile red line.
Remember if you didn't build it you can't call it yours.
6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.
https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw
Sergeant
4.56's aren't the only option for a re gear. Saxon did his with 4.10 ratio. Not sure all of what it took though, he may be able to add some information on this subject.
Chief 9-flats
Todd, I think the carrier will only go to 4.56 from stock. To get smaller, you also have to swap out the carrier which adds a lot more cost and complexity. It can be done though.
Remember if you didn't build it you can't call it yours.
6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.
https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw
Private
The first truck I built up was stock except for the SBC and I drove it from TX to CO and back several times when I lived up there and without any problems except for completely liquifing a walkman that was under the passenger seat. LOL! I ran the calculator and it shows 2627 with 4.56 and 35's at 60. Sounds like the t-case just needs to go no matter what.
Chief 9-flats
Put 38" Michelins on and it will be just right. The Michelins ride a lot better than just about anything else too.
Remember if you didn't build it you can't call it yours.
6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.
https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw
Grand Poobah
You can use the spreadsheet I have linked below to play with:
Tire diameter
Gear ratio in trans
Gear ratio in tcase
Gear ratio in axle
The rest will be figured for you.
I can add columns if you like as well...just ask.
Heres the link...right click...save:
http://www.m715zone.com/jonmisc/RPM_Calc.xls
Guess maybe I should link this from the Online Manuals page....
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!
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