"We always took pride in trying to make each one better than the last..." Diesel shared on Facebook on Thursday, Jan. 9, along with a vintage photo of the duo as Dominic Toretto and Brian O'Conner.
"P.s. Tomorrow we meet with the studio, regarding the future of the Fast saga...and the completion of Seven," he added.
There was much speculation as to whether the late 40-year-old actor would appear in the movie following his tragic death in a fiery car crash on Saturday, Nov. 30, but Universal Pictures has since confirmed Walker will be in the latest installment of the film franchise.
"Continuing the global exploits in the franchise built on speed, Vin Diesel and Paul Walker lead the returning cast of Fast & Furious 7, which will be released by Universal Pictures on April 10, 2015," the studio said in a statement. "James Wan directs this chapter of the hugely successful series, and Neal H. Moritz and Vin Diesel return as producers."
The 46-year-old actor has been using his Facebook page as a way to keep fans updated following the loss of Walker.
Diesel began the new year reflecting about his tremendous loss in 2013 and paying tribute to his late "brother."
"There was always moments of child-like laughter...We had accomplished so much by 2013...P.s. The complexities of Brotherhood, and the painful void... of it's absence," Diesel wrote.
He also shared an 18-minute video filled with special interactions with Walker over the years.
"A glimpse... of Dom and Brian… off screen," Diesel wrote on Facebook on Monday, Jan. 6.
The video features multiple clips from Walker and Diesel's time together, from promoting a film to their car-racing franchise, or just hanging out. At the end, the words, "Miss you..." flash across the screen.
(E! and Universal Pictures are part of the NBCUniversal family.)