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  #1  
Old 03-25-2012, 07:59 AM
Ford Ranger Owner
 
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Default what does alex ratio mean and how do you read it?

what dose gear and axel ratio mean. and how do u read it.
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  #2  
Old 03-25-2012, 08:05 AM
Haters Gonna Hate
 
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Default Re: what does alex ratio mean and how do you read it?

whos alex?
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  #3  
Old 03-25-2012, 08:29 AM
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Default Re: what does alex ratio mean and how do you read it?

differant gear ratios help some with bottem end power or top end driveability. the lower the gear ratio number, (like 3.55) will make the truck run at lower RPM's on the highway at 60-70+ MPH, and get better fuel economy at higher speeds. a higher number (like 4.10's) will make the truck accelerate quicker, and typically pull a trailer or heavy load better, but you loose some of your top end power and the truck will run at higher RPM's when you're at highway speeds, resulting in lower highway fuel mileage.

the other benifit of a higher gear # is that it allows you to run larger (taller) tires. bigger tires can actually drop the gear ratio to a lower #. so if you had 4.10 gears, and decided to run 31" tires, you would wind up with closer to 3.73 gearing, which can help improve highway fuel mileage as long as they arn't super wide.
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  #4  
Old 03-25-2012, 08:48 AM
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Default Re: what does alex ratio mean and how do you read it?

I always thought that the RPM's measured the revolutions of the crank shaft and had nothing to do with the axle ratio. How does changing the ratio of the rear axle affect the revolutions of the crankshaft? You may be correct. It may just have to be explained to me how this works. Can someone explain? I do understand that changing gear ratio can help or hurt in acceleration and towing power.

----------

I got it.
http://www.hotrodders.com/forum/effe...pm-140898.html
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Last edited by LoJosRanger; 03-25-2012 at 08:43 AM.
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  #5  
Old 03-25-2012, 10:05 AM
1998 Ranger 4X4
 
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Default Re: what does alex ratio mean and how do you read it?

RPM is crank shaft & is measured in the old days by a flexible shaft off a distributor drive fitting. Today its measure electronically off the ignition & has nothing to do with anything past the transmission input shaft.

The Ratio is read pinion gear rotation verses wheel rotation 3.00 to 1 is three pinion gear rotation to 1 rear wheel rotation.

If you lost the differential tag or can't convert the factory casting code; jack the rear wheels up off the ground & make a chalk mark on it.

Then make a chalk mark on the drive shaft. Rotated the drive shaft & count the revolutions to get one full wheel rotation. On a 3.00 to 1 you will turn the drive shaft three times for the wheel to turn once.
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Last edited by BEAR257; 03-25-2012 at 10:08 AM.
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  #6  
Old 03-25-2012, 10:11 AM
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Default Re: what does alex ratio mean and how do you read it?

Quote:
Originally Posted by LoJosRanger View Post
I always thought that the RPM's measured the revolutions of the crank shaft and had nothing to do with the axle ratio. How does changing the ratio of the rear axle affect the revolutions of the crankshaft? You may be correct. It may just have to be explained to me how this works. Can someone explain? I do understand that changing gear ratio can help or hurt in acceleration and towing power.

----------

I got it.
http://www.hotrodders.com/forum/effe...pm-140898.html


It's common sense bud.
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  #7  
Old 03-25-2012, 01:56 PM
Ford Ranger Owner
 
Join Date: Oct 2011
Posts: 51
Default Re: what does alex ratio mean and how do you read it?

What skylark is saying is when you put a bigger or smaller tire size on it essentially changes the final drive ratio. It will take less or more rpm's (depending on what you do) to do 60 mph than if you were to have left the tire size alone.
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  #8  
Old 03-25-2012, 03:53 PM
WS6 WS6 is offline
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Default Re: what does alex ratio mean and how do you read it?

An even more general way to read the ratio is input: output Gear ratios are everywhere and not just on a vehicle. Understanding the numbers in general will help you understand how things work and why more so than just knowing what ratio works where. Lower gearing, which means higher numerical value, offers more mechanical advantage or leverage. That's why you can accelerate better from a stop in first than second. First is a lower gear.
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  #9  
Old 03-25-2012, 04:01 PM
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Default Re: what does alex ratio mean and how do you read it?

Quote:
Originally Posted by HIGH TECH REDNECK View Post
whos alex?
my best friend?
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  #10  
Old 03-25-2012, 05:13 PM
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Default Re: what does alex ratio mean and how do you read it?

repeat after me: A-X-L-E
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  #11  
Old 03-25-2012, 05:21 PM
They Call Me "T. Machine"
 
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Default Re: what does alex ratio mean and how do you read it?

Alex Ratio sounds like a detective series
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  #12  
Old 03-25-2012, 06:24 PM
Haters Gonna Hate
 
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Default

Quote:
Originally Posted by doyouquaxu

my best friend?
He on fb?

Sent from my VS910 4G using FRF App
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Yes I traded my Ranger in on an F150 and yes I think its a better truck. No I wont debate with you about it
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  #13  
Old 03-26-2012, 07:30 PM
Ford Ranger Owner
 
Join Date: Mar 2012
Posts: 69
Default Re: what does alex ratio mean and how do you read it?

ok guys i get it i cant spell. i legit have a problem with letters. lol if u read my signature im new and not all knowing. but to thos who legitly helped thanks alot i understand now and this info will help alot.
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MY FIRST TRUCK SO IF I ASK SOMETHIN DUMB JUST ANSWER DONT HATE Green, 1996 XL 2.3L four banger, automatic, white cab, crome rimes 165 xxx km (100 xxx miles roughly) all for a grade tottal of 1000$
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