im pretty sure that there is an issue with the speed sensors in this conversion. apparently the ABS module reads the speed sensor and affects the way the trans shifts. I think it can also prevent it from going into top gear all together!
I read that disconnecting the ABS unit will fix the problem....does your car still have active ABS? if its not working then you can disconnect the module and it should be good.
check this out, should be able to help you
http://www.toymods.net/forums/showthread.php?t=4419
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