speedo not working

[HSVSENATORVY]

hi guys/girls,
just finshed replacing my old auto with a new custom 4l60e auto to handle 600kw through to the rear end and now the speedo is not working good it keeps getting bad readings after the new box went in berfore it had no problems would like to hear if anybody has ever had this happen to them and how they solved it thanks...

 

[HSVSENATORVY]

it's not the sensor or loom just been checked over now looking at the bcm dose anybody know how to reset the bcm???

 

[Ghost]

Ok this is what i want you to try if u havent used the older sensor take the sensor out of both boxes and swap the cogs from the new box sensor to the old box sensor and put the old box sensor into the new one sometimes the sensor do different readings the car is used to the old sensor give that a try i hope this helps if you have already tried that u need someone that can hack into the bcm and reboot it once again good luck

 

[HSVSENATORVY]

thanks mate for your help i will do that today cheers mate

 

[HSVSENATORVY]

it's not the sensor it's the bcm goodbye hard earned cash