My son has moved to Texas and working there for a company headquarters in Missouri. Ford motor credit and suntrust has repossed a few service trucks sold by a dealer in Maryland and the contracts assigned to the above creditors . There may be a deficiency. Can the finance because. Garnish his wages in Texas even though he is a Texas resident pre judgement in Maryland

Yes they can.

Texas does not allow many judgements on wages, if he is working in Texas, is there a physcial building and office in Texas, not headquarters ?

Do they withhold Mo state taxes ?

I am about 5 years old on Texas laws but previously they would not be able to garnish the wages

TX does not permit wage garnishment except for a limited # of situations (Texas Wage Garnishment Law | Nolo.com).