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Post by troylee442 on Dec 27, 2007 22:52:46 GMT -5
just bought another toyota. 1990 3.0L standard tranny SR5 ext cab msd ignition. it has 33's right now with a 4" procomp lift and first thing i wanna do is gear and lock it. but i was just wondering if i can tell if its already bin geard for the 33's without opening up the diffs. cause it seems to push the tires really well i get about 17 mpg and the speedo doesnt seem to be off. i was going to go to 4.88s. thanx
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Post by fourwd1 on Jan 6, 2008 22:36:42 GMT -5
Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential.
Put a reference mark on the tire and the driveshaft.
Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs.
Carefully count the number of full revolutions the driveshaft makes.
This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns for one tire revolution, you probably have a 3.73 gear ratio.
Turning the tire for 2 full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.
Your reading won't be exact, but it should be what's closest to the standard Toyota ratios of 4.10, 4.30, 4.56, or 4.88.
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