FredTJ

On the gen II 4Runners, how is the speedometer adjusted for larger tires.
Coming from a Jeep Wrangler (TJ) background, where it's easy.
The Jeeps have a speed sensor (gear driven) in the outout tailhousing of the xfer case. Simply remove one bolt, pop the sender out, pull the gear off the end, replace with a different toothed geer (which DC sells a wide selection of, suprisingly enough), pop the speed sensor back in, replace bolt and bingo.

Trying to wade through all the information and it looks like maybe the 4Runners have a cable, but it looks as though they may have a speed sensor.

I'm looking at '92's, '94's and 95's.


Thanks,
Fred

4runnermt

Hey Fred, I am wanting to know this exact same thing, hopefully someone will chime in! Welcome to yotatech!

mt_goat

Yep Toyotas have a speed sensor in the t-case too. The gears along with the shaft can be replaced with different sizes. There are mechanical driven (cable) and electronic senders depending on the model.

4runnermt

Hey MT Goat, do you know of a good place to get the gears?

mt_goat

You might have to get a complete sender with gears from the dealer, Marlin Crawler or the junk yard. New they cost about $200 for the electronic senders. I don't know where you'd find just the gear and shaft (the shaft and gear are joined or fused together as one) but you can swap them between senders with a little modification). I may have a spare 18 tooth mechanical sender soon.

mt_goat

Here's a pic of the location of the sender in my old transfer case: http://community.webshots.com/photo/...42310107nlgRvA

Here's a pic of the two different senders I've seen, the mechanical is the upper one. http://community.webshots.com/photo/...42310107nNUnQh

Here's a pic of the gear markings, one is a 20 tooth, one an 18 tooth: http://community.webshots.com/photo/...42310107axatpc

The 20 tooth was in my 93 V6 4x4 auto tranny SR5 with 4.88 gears and 31 inch tires from the factory.

The 18 tooth mechanical sender was in my gear driven transfer case from Marlin Crawler.

FredTJ

Pretty similiar to the Jeep ones, though all of those are electrical.
Anyone very find a "gear tooth" chart that shows the "correct" number of teeth for the speedo sender based on tire size and diff gearing ?
There are a lot around (charts) for the Jeeps.



Thanks again,
Fred

Elton

anyone ever try This

mt_goat

Its possible that Jeep uses the same gears, I heard they use essentially the same auto transmissions.

FredTJ

Ah, some, kinda, sort of.

The TJ's ('97 to current, auto trannies) use either a TF999 (904) or a RLE42RE (basically a bastardized 604/606).

The Cherokees used the "AW4" which is the A340F with a 231 xfer case.

The auto 4Runners use the A340H (intergrated xfer case).





Fred

4runnermt

I asked this lady in the parts at the dealer and she didn't know anything at all about these parts, so maybe I'll have to call again and try to talk to someone who knows! I hate having my speedo off.

-MaTTi-

This is how I made the speedo adjustment. Just made it yesterday. It´s works fine!

I ordered the Speedo Corrector Kit (KC5380) from Jaycar.

The first surprice was that it was do-it-yourself kit. I didn´t checked it well enough from Jaycar. But no problem, I´ve tined before. It took 1½ hours to get it done.



I didn´t found better case (wooden tobacco case)



There is three wires from sensor. The right one was the green-red one. First I measured the voltages AC and DC and seems like I have to tin one optional resistor more. But when I tried it first time, nothing happened. I have to take it (resistor) off. Then everything works fine. I can adjust speedometer 0-99 % more or less! I love this.

Things to do:
-you have to cut this green-red wire and tin wires from there to this corrector
-you need +12V to corrector(when key is ACC-position). I took it behind the radio. And one ground too.
-good and simple place for this corrector is behind co-drivers side panel next to pre-heating timer (I have diesel).

mt_goat

Wow that's interesting, do you just calabrate it somehow? Did you have to actually solder everything onto the circuit board?

-MaTTi-

Can you see those small swithes which have numbers 0-9? If you want a correction of 5 %, simply set right one to "5". Left one alters the correction by tens, so setting of "1" on left and "5" on right results in a 15 % correction.

I know how much I need correction before, so I just set "6" to right switch. Now the speedo´s reading is just right.

Saint_Berzerker

Here's a calcuator for calculating speedo with bigger/smaller tires:

http://www.1010tires.com/TireSizeCalculator.asp

Glenn

I used an adapter from Tacoma Speedometer & Instrument. It's a little gear thingie that goes on the tailshaft. Mine is a mechanical speedometer, so this might not work for an electronic one.

4runnermt

I must have an electronic speedo since my transfer case looks just like Mattis.