How do I find the gear ratio on my 1992 Toyota fwd pickup? It has a 5 speed manual trans and 3,0 v6 engine.?

Question

I asked this question and recieved the answer below.

Answer recieved:
its most likely 4.10, but you can try the dealer with your vin#, you can also count ring gear teeth and divide it by pinion teeth, also you should be able to mark a tire, count how many times the drive shaft goes around to make the tire go around once

Problem: I am confused.

The number on the VIN
 plate indicate the ratio is a 4.56, however, I marked a tire and the
 drive shaft, the shaft turns approx 2.3 turns to one turn of the tire. I
 double checked to be sure. What does this likely mean? I would guess
 the ratio to be fairly low? IF it is only a 2.3 ratio, then the engine
 RPM will be fairly high at, say, 60 MPH? At 75 MPH the Engine RPM is
 close to 3500 RPM.   Can someone help clear up the confusion?   Was there even a ratio of 2.3 ever put into a 1992 Toyota pickup?
Marvin

grandeyota · Accepted Answer

There was never a 2.3 gear ratio made for the toyota 8" rear. Some of those trucks with the 5 speed transmission came from the factory with a 31x10.5xr15 tire size, is so they came with a 4.56 axle gear ratio. The automatics with 31's had 4.88s.

It means your only going half of the diameter of the ring gear. You more than likely have an open differential and if you have both tires off the ground the number would most likely be cut in half. 
2.3x2=4.6 
4.6 is close enough to 4.56 to be right on trying to eyeball it. 

FYI, these are the only gears ratios that are made for that truck:
3.90, 4.10(4.11), 4.30, 4.56, 4.88, 5.29, 5.71

Francisca · Answer

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RE:
How do I find the gear ratio on my 1992 Toyota fwd pickup? It has a 5 speed manual trans and 3,0 v6 engine.?
I asked this question and recieved the answer below.

Answer recieved:
its most likely 4.10, but you can try the dealer with your vin#, you can also count ring gear teeth and divide it by pinion teeth, also you should be able to mark a tire, count how many times the drive shaft goes around to...

Tamara · Answer

You might have broken torsion springs in the clutch plate. This happened to a Honda Prelude that I had. Are you sure the slave cylinder is travelling enough? Maybe the clutch is just not releasing all the way. Good luck on that.

Anonymous · Answer

the driveshaft/tire rotation isn't right because you have another gear set in the transmission you have not accounted for... do you have the stock size tires on the truck? both of these will skew your results... here is a mathmatical method to calculate gear ratio but you would need to have 1:1 gear ratio in tranny (4th gear)
 
rpm x tire diameter
------------------------------ = gear ratio
mph x 336

to measure tire diameter put a mark on tire and measure the distance it travels in one revolution

hope this clears things up

Anonymous · Answer

If the VIN indicated you had 4.56 from the factery, and you have not changed it, then thats what you have. You cannot go by turning the drive shaft and watching the wheels, either trust the dealer info, or count teeth and prove them right.

Anonymous · Answer

If your rearend is a slip dif then just spinning the shaft and counting revolutions will not work.  you will have to prevent one or the other tire from spinning.  then recount the revolutions of the tire.

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How do I find the gear ratio on my 1992 Toyota fwd pickup? It has a 5 speed manual trans and 3,0 v6 engine.?

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