Alright im sick of searching and not finding the right answers. Well I have the 2jzgte motor with the stock sc300 auto gears which are 4.27 but my speedometer is totaly off(im also running a TT auto trans). When i go 65 on the freeway it says im doing about 90. Im wondering if install the supra tt rear end with 3.77 gears would that correct my speedo problem. I know about the yellow box. but i want to correct this without going an temporary fixing this.

What else could i try to fix the speedo problem. come on guys chime in. i bet that most the swapped sc s out there doesnt have this problem so what could it be.

 

installing the supra auto tt rear end should correct the problem. Which ecu are you running? That might make a difference too.

 

I would imagine hes running a 2jzgte ecu. I cant help you out with the rest.

 

are you running a stock speed cable?...

 

Hey im running a AEM EMS for my ecu. the speed cable? i have the supra tt throttle body cable. but speed cable dont know.