Do you have one or both apportioned plates?
I have one and don't know where the other one is
You need to send in the plate and your old cab card within 30 days after you receive your new apportioned plates. Failure to return your license plates can result in suspension of your IRB account. The IRB will issue new apportioned plates that have a different number, along with a new matching cab card.
I'd like to ask regarding Transfer IRP registration online.
You can apply to transfer an IRP registration online through the New York State One Stop Credentialing and Registration system OSCAR. For more information go to https://www.oscar.ny.gov/OSCR/OSCRCarrierHome. How does it work online?
and can it be done over the phone?
You cannot transfer an IRP record over the phone. You can call the IRB with questions at 1 - 518 - 473 - 5834.
and by mail?
If you apply by mail, send photocopies of your proof of identity.
What if the new vehicle weighs more than the old vehicle?