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mike
1990 toyota 4runner
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3 Posts
Discussion Starter · #1 ·
how do i find out what kind of gear ratio i have in my differentials without actually looking at the numbers on the crown ring gear? is there a code that tells me?
second question___

how do i know i find out if either my valve seal guides are gone or piston rings are gone. i burn a bit of oil!

mike
 

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One with the farce
Joined
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3,219 Posts
1 - You have a tag on the door frame/pillar...have a look at it where it says "axle/trans" or similar, and read what it says.
Read these links to figure it out...
Diff page 1
Diff page 2

2 - Does it puff blue when you step on the gas after coasting down a long hill, or puff when you start the engine? Do a compression test and record your numbers. Do it again, but put a squirt of oil in each cylinder before cranking to test, then compare numbers. If the latter set is higher, your rings are shot. If not, it's most likely the valve seals leaking.
 

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mike
1990 toyota 4runner
Joined
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3 Posts
Discussion Starter · #3 ·
oh boy im seriously no car guy i looked at those charts and i was confused
the numbers that show on my truck are=
C/TR 3H4/HK11
A/TM G292/W56

so i could probably goto a local mechanics shop to get a compression test im assuming?

she does blow blue smoke especialy when im idleing in traffic.stop and go is when i notice it
 

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Registered
Lndcrs, 4run, camry,
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2,448 Posts
Mike,

Call your toyota dealer parts dept. and ask them what types are supposed to be on your vehicle and with those numbers that you have shown they will be able to tell you which ones you have. I have only done research on the rear on my rig which I think is the same year as yours if your user name is for a 1990. The 1990 was fitted with two types it could be either a 4.10 or a 4.55. The G number will be for the rear. Not sure for the front but the parts dept can get that one with that info. Good luck.
jetwhine
 

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One with the farce
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3,219 Posts
C/TR is the colour and trim.

A/TR on yours is G292 and W56. "G" is an 8" crown, the "29" is a 4.10 ratio, and the "2" means it's a 2-pinion open diff.

The W56 is a 5 speed aluminum-cased transmission (found behind most 4X4 4 cylinder trucks/4Runners after 1985.)

Edit: Sounds like the rings, unless you PCV is really plugged or something. Has the engine ever been rebuilt, that you know of?
 

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mike
1990 toyota 4runner
Joined
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3 Posts
Discussion Starter · #6 ·
oh thank you lol.

now in regaurds to the motor i dont think its ever been rebulit. almost everything is stock on her im just asking to see if i could do a quick fix on it temporary but if all faills and the rings are shot i may do a motor swap!

shes got 407k on her it almost might be time to rebuild a 22RE!
 

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Registered
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26 Posts
I may be out to lunch here but my understanding is that if you jack the ass end of the truck up, and rotate one of the rear tires one full rotation and count how many revolutions the rear drive shaft makes, that's your gear ratio. Now the difference between 4.10 and 4.55 rotations is substantial enough that if you know those are the two choices, then you should be able to figure it out...

Or I could be totally messed up.
 

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Soylent Green sales
rock crawler
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12,801 Posts
I may be out to lunch here but my understanding is that if you jack the ass end of the truck up, and rotate one of the rear tires one full rotation and count how many revolutions the rear drive shaft makes, that's your gear ratio. Now the difference between 4.10 and 4.55 rotations is substantial enough that if you know those are the two choices, then you should be able to figure it out...

Or I could be totally messed up.
It's more accurate if you do 2 rotations and divide, but it doesn't matter.
The question was answered in post #5.














The answer is 4.10 :D
 
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