yellowfjhunter

I have a 91 yota Extracab PU with the V6 motor, manual transmission, 529's, 35's, 4" suspension lift, 2" body lift. It is also my daily driver. Is there any way to correct the speedo for on-road use? Talking to my local tire shops, transmission shops, has gotten me no where fast. Right now, I think that I am about 10% off. My speedo shows 60mph and I am going about 54mph.
Thanks!

ffryno13

idk but i am having the same problem. maybe a cheap GPS or something

eric-the-red

If you have an electronic speedo, ie no cable just wires then you could use a Dakota Digital SGI-5. If it's a cable driven speedo you'll need to replace the drive gear in the trans.

1989toy4wd

Search!!! LOL, Ill be the first to say it...

But pretty much all you can do is change the gear on the speed sensor in the transmission, I dont know where you can get one, but thats how you do it!

ffryno13

i have searched it before. with all the other trucks it seems that there is a plug n play for every other truck but ours

yellowfjhunter

Thanks for the replies, it sounds like we are all having the same problem. I have been told about the drive gear, but nobody seems to know if it is made for this vehicle. My guess is not. Not a big deal I guess!

scuba

yoder519

mine is the opposite of yours. i have a 22re with 33s. it reads 56 when im actually going 65..interesting

yellowfjhunter

I think the reason for being opposite, is that you went up in tire size, but not down in gears. I have an FJ with larger tires, stock gears and it is the same as yours, speedo says 60 and I am actually going 65-66. My PU has 529 gears with the 35's. Great for low range, crap for highway speeds!

If I am not mistaken, your truck is a 95 and I think that that may have an electronic speedo. Those models, I think, can be electronically calibrated.

mt_goat

I don't really have the answer but I've got pics and some info.

The cable sender is on top, the electric sender bottom:



Note the cable sender gear is 18 tooth and the e-sender is 20 tooth. It also looks like the gears may be interchangable, if you can figure out how to switch them. A gear with more teeth should read a lower speed.



On my truck the transfer case originally had the e-sender, when I swapped to dual cases it had a cable sender in it that didn't fit my truck's type, so I swapped out the senders and it works fine.

ffryno13

fjhunter where did you get the formula for actual speed cuz i have 37s it would be nice to know how fast i am really going. adn does it change percentages if i am going 35 or 55

yoder519

theres a thread lurking around here somewhere that has a link to a site that has a calculator for tire size and all that good stuff. maybe 4cralwer.com has it..

wait nvm its 4lo.com or 4low.com one of the two

ffryno13

ok it is 4lo.com but they dont account for new gear ratios

yellowfjhunter

To figure out how fast you are going, just have someone in a regular, stock vehicle pace you and tell you how fast you are going. This or a GPS nav device should tell you how fast you are going.
OR...
next time you see a cop radaring, speed past him and pay attention to what your speedo says, LOL. maybe he'll understand????

mt_goat

http://www.ttora.com/forum/showthread.php?t=56784

ffryno13

ha ha thanks mtgoat thats the one i ve been looking for

Jasson Aldana

same thing, but mine is higher it says 80 but it really is 92 and can get to 75mph in 3rd gear whit 33 tires and stock gears not sure why.