dennis1 wrote:
Hello,
I have a 2007 Duramax Chevy with Allison 6 Speed Trans. Had the Allison dealer change the spin on filter and refill with Transend. They say no need to drain everything. That's is only needed if you rebuild. The Chevy dealer say drain everything including the lines to the radiator and refill and replace filter. Who is correct? I took the cheaper route from the allison dealer.
Both are wrong. Go to the Allison website and read the correct procedure. In order for the transmission to be considered to be 100% synthetic fluid, Allison has a set procedure and neither one gave you the correct information.
