short shifting a340 ? any ideas

[mxracer92]

just bought a cressy with a jzx81 1jz engine package fitted , its been running for years now.

didnt realise this when test drove but ive now found out on WOT it short shifts at about 5k

if you manually shift the box its fine revs out to the rev limiter , but in D drive it shifts early ..

any suggestions ? tps ? speed sensor ?

[dumbass]

could be speed sensor to ecu
they have 2 speed sensors on back of box im pretty sure on chasers
and one goes thru speedo and other goes thru abs ecu
so u need to find which oen is used as the abs one needs to be modified to work
so maybe they modified it and its not right
is there any small black boxes near the ecu