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Since this whole health thing, I put the truck on the back burner. I did buy the adjustable modulator, not much change. I am probably going to go through the pump and lines again when it is not 100 degrees outside. I may try the vacuum switch suggested by cucvrus if the pump in junk, we'll see.

I believe I have replaced all rubber lines related to the system but will recheck when it is not freezing outside, no garage. The transmission was initially working when I bought the truck and then slowly shifting into third gear at a high speed (50mph) and then no third gear. I did check the...

Very useful information, thank you. I am still learning on the diesel curve. I tried to locate a pump, you are right, not going to find one easily. Through my research, so far, there are two vacuum modulators for the TH400 with a 6.2 diesel. There is the one the parts store sold me and...

I did all the lines and checked every connection for vacuum. I didn't use any type of vacuum meter, so maybe the pump is going bad. Thank you for comment, I'll chase that next.

Just installed a new vacuum modulator because tranny wasn't shifting into third. Does anyone know the shift points for this tranny? It shifts into third gear now but isn't shifting until about 50 mph, seems high to me. I did some research on the TH400 and some have said the shift points for...