Good morning everyone. I have a 1977 Chevy C20 Scottsdale 5.7 350 engine. My father and I received this truck for my grandfather. We decided to get it ready for use as a farm truck. Due to a very bad oil leak I did valve cover gaskets and oil pan gasket. We did a tune up with new plugs and wires and a distributor. We went ahead and did the transmission pan gasket because it wa a beginning to leak. After we performed all those maintenance, it was time to test drive. I started it up and the engine sounds good. I put it in reverse and I notice I was pushing the gas pedal a little harder before it would actual move. Same for putting in drive and it would take a moment before it would move. The other day I was driving it and around 30 mph I notice and heard that it didn't shift so I decide to push the gas further and it shut off. I turn the truck back on and drove around 30 mph and it shut off again. I felt like it would not shift. It did one time shift but the truck shook hard. I feel like there is a transmission problem. I've been a mechanic for about 5 years and haven't dealt much with diagnosing trans problems. I have always been told don't drain the trans fluid after a certain number of miles. The truck only has 97k.
Can anyone assist me on this.
Also does anyone have a diagram of the vacuum lines.
Ive heard that ******** all my life and it is just that ********! Think about it. When ever the transmission is running, there is tranny fluid being sucked up from the pan and pumped through out all the various passages. So why would it change or hurt anything, to drop the pan change the filter and add new fluid?
For that matter how could it do any damage to do a flush and pump out the old while replacing with fresh fluid?
If for some strange reason a person would want to and somehow was able to do a reverse flush that might be a different story but even that doesn't stand up to scrutiny either.
That myth involves the idea that you are gonna pump all the contaminants from the pan into the passages. Well who in the hell puts the dirty pan back on with all the sludge still in it ???
I cant stop laughing when I hear these quicky lube employees spouting that stuff off LMAO. Just goes to show you how much they know or that they actually don't know a damn thing about what they do for a living! YIKES!!!
I have done tranny flushes on high miled transmissions many times. You know what it does. They drive incredibly better. Like Day and Night better!
Its a good idea to run some additives in well used transmissions.
I use Valvoline Max Life. It works real good! Every tranny I have put that stuff in works noticeably better afterwards.
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It costs me $32 for 5 liters but the stuff has every type of additive you can get and it works for both of our new vehicles as well as the old stuff. It is based on conventional base oils but then has all the additives including synthetic additives. So its like the best of both worlds.
I run this stuff in my power steering/Hydro boost system on my ol squares too. Works fantastic.
I use it regularly in my 90' 4L60/700r4 and that tranny runs like a champ, every time it shifts its beautiful!
