Hello and thank you for using just answer. Is the check engine light on?
Is this a 2 orXXXXX
Does the entire vehicle shake or do you feel it in a certain part of the vehicle?
Does it only happen when initialy accelerating from a stop or does it happen at higher speeds also?
How many miles are on the truck?
THank you for the reply and sorry to hear of your car troubles. Sorry I should have asked before is this an automatic transmission I assume?
Ok it sounds like this is a transmission related concern. The good news here is that this could be a free repair.
Before you do anything I would check the transmission fluid level and condition, if the fluid is low it will cause this, if the fluid is very burnt there is a possibility you have a torque converter shudder that indicates early transmission failure (don't shoot the messenger)
There is a service bulletin ( TSIB# XXXXX) for an updated ECM for shift related concerns, this is a free repair for 8 years/80,000 miles at any dealer.