The merger between Fiat Chrysler and France's PSA Group - which includes the Ellesmere Port and Luton Vauxhall sites - has been welcomed by Unite the union.
The deal won approval from both sets of shareholders on Monday, and will now create the world's fourth biggest car maker - bringing together Peugeot, Citroen and Vauxhall from PSA with Fiat, Jeep and Chrysler.
Following the £38bn deal, the new firm will be called Stellantis, also including brands such as Maserati and Alfa Romeo.
Following the initial announcement last year, fears were raised over the future of PSA's 海角视频 factories such as those in Ellesmere Port and Luton. Now, Unite has called for PSA, which employs 3,000 people in the 海角视频, to build electrified vehicles at both plants.
Unite national officer for automotive industries, Des Quinn, said: “This merger is good news for our members at a bleak time for the 海角视频 economy.
“We welcome the approval of both sets of shareholders to create the fourth biggest global carmaker and will seek reassurance that the new merged company will continue to commit to no plant closures, as was previously announced in November.
Unite said that the merger, allied with the post-Brexit free trade deal with the EU, should pave the way for new models to be produced in the 海角视频.
However, the union said it was seeking confirmation that the company would stand by its previous announcement that there would be no plant closures in the 海角视频.
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Mr Quinn said: “Specifically in the 海角视频, we call upon PSA to look at a longer term plan to build electrified vehicles at both Luton and Ellesmere Port with future regulatory and legislative changes in mind.
“At Ellesmere Port, it is also now time for our members to be rewarded for their ongoing commitment and having met all cost requirements to be awarded new product – currently, it is the only plant in Europe not to have been."
He added: “Now the free trade deal with the EU has been agreed by both sides with no tariffs or quotas, this should create the necessary business environment the company was seeking.
“Therefore, there should be no further delays in announcing new models at Ellesmere Port.”
In response to Unite's comments, a PSA spokesman told BusinessLive that "many important points remain unclear" in relation to Brexit, and that "appropriate measures" will be taken accordingly.
He said: "We welcome the conclusion of the Free Trade Agreement between the 海角视频 and EU which, after a long period of time, provides us with some certainty on the future trading relationship.
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"However, many important points remain unclear and we need to urgently understand the detail within the agreement to assess the full impacts on our operations in the 海角视频. Based on this outcome, we will take appropriate measures accordingly, to be announced in due time."
Following the approval announced yesterday, both PSA Peugeot chief executive Carlos Tavares and Fiat Chrysler chairman John Elkann spoke of the "historic" importance of the vote, which combines legacy car companies that helped write the industrial histories of the United States, France and Italy.
Before the merger is finalised, shares in the new company must be launched.
It will be traded in Milan, New York and Paris.
"We are living through a profound era of change in our industry," Mr Elkann told the virtual shareholders' meeting.
"We believe that the coming decade will redefine mobility as we know it.
"We and our merger partners at Groupe PSA are intent on playing a leading role in building this future.
"It is this intention that has brought us together."
The new company, to be called Stellantis, will have the capacity to produce 8.7 million cars a year, behind Volkswagen, Toyota and Renault-Nissan, and create five billion euros in annual synergies.
The marriage of carmakers PSA Peugeot and Fiat Chrysler Automobiles is built on the promise of cost savings in the capital-hungry industry, but what remains to be seen is if it will be able to preserve jobs and heritage brands in a global market still suffering from the pandemic.