I have a 95‘ Z71 Silverado 5.7 with a 4L60E transmission. I have a new transmission in it and I understand that if I flush my transmission regularly I will keep my transmission a little longer before I have to replace it. This is to be done at every 30,000 miles. I just don‘t know HOW to flush the transmission. I used to drain the fluid, put new fluid in, drive it a few days, drain the fluid, change the filter and put in the GOOD fluid.
True for most people but some people don't care what others think and they just make mistakes but I think it is too do with confidence and if someone makes a mistake they may feel embarrassed or that someone might make fun of him/her. Although some people don't learn from their mistakes
Flushing a Transmission is a way for shops to make money and a good waste of yours. If you never let a transmission get low on fluid and basically overheat, the fluid in it will last forever. I now have 137,000 miles on a '91 Ford Explorer, never flushed or changed, 219,000 on a '83 El Camino, and my mother has 186,000 on her '90 Chevy Van. We have never changed the fluid or flushed them at all.
When the shop flushes the transmission they push the fluid through the transmission in a reverse direction than what it normally flows. This puts all the crap and little bits of metal that are usually found on the bottom of the tranny pan back through the passageways of the transmission. Not a good idea to have a transmission flush. The best way is the way you described. Drop the pan, clean/change filter, whichever is appropriate for your car, change the pan gasket and if your torque converter has a drain plug, drain that also. If no drain plug on the torque converter then just do the above and the tranny is cleaned.
I've been in auto body repair for 40 years.In that time,I've cut open and seen first hand the undercoat jobs that have been done on untold vehicles.I have never seen one done anything close to the way it should be done to be of any benefit.It's a service that even trained personnel can't do well enough to help. The one and only way to see for yourself is to remove the door trim panel or maybe a fender liner.But,you're not going to do that and everyone knows it.Even if you did they would have some weak excuse for doing a bad job.
Really you need a transmission flushing machine that is usually available at a local shop, to be sure to get the best possible flush. Ok well the last gentleman seems to have a lot better idea, never thought of that.
