Author Topic: Speedo gears (Read 4906 times)

jrock · « **on:** Dec 01, 2008, 03:32:39 PM »

Is there a speedo gear out there that I could put in to correct my speedometer if I'm running 33's and 4.30's?

79coyotefrg · « **Reply #1 on:** Dec 01, 2008, 06:20:39 PM »

pull the gear from a 1980 or 81 truck with the G072 gear code

jrock · « **Reply #2 on:** Dec 01, 2008, 06:24:33 PM »

Can that G-072 be found in a 2wd?

jrock · « **Reply #3 on:** Mar 19, 2009, 07:42:03 PM »

Anyone help me out... have one lying around collecting dust? You could sell me it. Please.

boggerunner · « **Reply #4 on:** Mar 19, 2009, 08:20:21 PM »

ive got a few in a box with all my spare t-case parts, but i need to know how many teeth u need on the gear.

jrock · « **Reply #5 on:** Mar 19, 2009, 08:24:36 PM »

boggerunner · « **Reply #6 on:** Mar 19, 2009, 08:26:29 PM »

did u pull that # out of thin air?
i will go out to the garage and see what i have, be back in a few

jrock · « **Reply #7 on:** Mar 19, 2009, 08:45:41 PM »

I think mine is 18. So 17 or 19

. Now I think 17. haha. Yes, 17.

boggerunner · « **Reply #8 on:** Mar 19, 2009, 08:46:47 PM »

i dont have a 17, i have 2 18's 1 19 and 1 20

jrock · « **Reply #9 on:** Mar 19, 2009, 08:55:44 PM »

Decisions decisions.... I'm lost.

jrock · « **Reply #10 on:** Mar 19, 2009, 09:00:26 PM »

It needs to be out of a truck with 3.90s. I know that for a fact.
http://www.4x4wire.com/toyota/faq/vin/
Very bottom of the page and look for G-07

boggerunner · « **Reply #11 on:** Mar 19, 2009, 09:02:10 PM »

its prolly the 20 tooth one

jrock · « **Reply #12 on:** Mar 19, 2009, 09:22:46 PM »

Don't more teeth mean a slower speedo? Otherwise I'm with you.

emsvitil · « **Reply #13 on:** Mar 19, 2009, 10:05:45 PM »

Just larger tires, less teeth on speedo gear = (old tire diameter/new tire diameter)* existing teeth

Just a change to larger ratio (4.10->4.56), more teeth on speedo gear = (new ratio/old ratio)*existing teeth

jrock · « **Reply #14 on:** Mar 19, 2009, 11:05:33 PM »

Quote from: emsvitil on Mar 19, 2009, 10:05:45 PM

Just larger tires, less teeth on speedo gear = (old tire diameter/new tire diameter)* existing teeth

Just a change to larger ratio (4.10->4.56), more teeth on speedo gear = (new ratio/old ratio)*existing teeth

So, I want less teeth. Right?

I need to

on this, then it will make sense again.

boggerunner · « **Reply #15 on:** Mar 19, 2009, 11:09:53 PM »

yeah he lost me too, just make it simple for us special people, less or more teeth?

emsvitil · « **Reply #16 on:** Mar 19, 2009, 11:57:24 PM »

Quote from: boggerunner on Mar 19, 2009, 11:09:53 PM

yeah he lost me too, just make it simple for us special people, less or more teeth?

I'll need original tire size
Original axle ratio

jrock · « **Reply #17 on:** Mar 20, 2009, 07:11:34 AM »

Was: 29, 4.30, Automatic
Now: 33, 4.30, W56

emsvitil · « **Reply #18 on:** Mar 20, 2009, 10:13:34 AM »

Quote from: jkief86 on Mar 20, 2009, 07:11:34 AM

Was: 29, 4.30, Automatic
Now: 33, 4.30, W56

The W56 would have the speedo gear from the donor, so need the axle ratio from the donor vehicle.............

For Tire diameter change:

29/33 * current W56 speedo gear = .88 * Current W56 speedo gear = new speedo gear

If axle ratio of donor vehicle was 4.3, you're done

otherwise:

(4.3 / (donor axle ratio)) * (new speedo gear above)

jrock · « **Reply #19 on:** Mar 20, 2009, 12:14:38 PM »

So a w56 speedo combination is .88 so what is a A340's speedo combination? I could pull the speedo from my truck as it is from the auto but I thought I could research it online. I still think it's a 17 tooth. So does anyone know if there is a 17 tooth speedo?

GJToyotabug · « **Reply #20 on:** Mar 20, 2009, 12:55:19 PM »

ok i have one to find out 4.10 rear 32's from 4.10 rear 29 or 28 whatever origonal is

emsvitil · « **Reply #21 on:** Mar 20, 2009, 02:17:20 PM »

An 86 with W56 had 4.10s and an 18 tooth speedo gear (225 /75 R 15 stock tire 28.3" diameter)

With 31s, (30.5" diameter), I went with 17 tooth.

jrock · « **Reply #22 on:** Mar 20, 2009, 02:20:46 PM »

So there is a 17 tooth.

emsvitil · « **Reply #23 on:** Mar 20, 2009, 03:03:08 PM »

Quote from: jkief86 on Mar 20, 2009, 02:20:46 PM

So there is a 17 tooth.

Well, 15 years ago there was........

jrock · « **Reply #24 on:** Mar 20, 2009, 09:16:35 PM »

Okay, I have a 19 tooth, that came from the automatic.

emsvitil · « **Reply #25 on:** Mar 20, 2009, 10:58:33 PM »

An 18 from the W56 would put you about 4% off........

Tallchevy · « **Reply #26 on:** Mar 20, 2009, 11:53:25 PM »

Quote from: jkief86 on Mar 20, 2009, 09:16:35 PM

Okay, I have a 19 tooth, that came from the automatic.

So break 2 teeth off & you'll have 17

I don't know if there is a speedo shop in Stockton but give these guys a call & ask them. I'm sure they have one or can tell you where to get one.
http://www.speedoelectric.com/

jrock · « **Reply #27 on:** Mar 21, 2009, 07:09:00 AM »

Quote from: emsvitil on Mar 20, 2009, 10:58:33 PM

An 18 from the W56 would put you about 4% off........

True, but 10% is easier to calculate.

Quote from: Tallchevy on Mar 20, 2009, 11:53:25 PM

So break 2 teeth off & you'll have 17

.
I'll check that shop.

unclejpl4x4 · « **Reply #28 on:** Mar 21, 2009, 07:37:24 AM »

subscribing so i can find this later $Beer Chug\'n$

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