You're welcome,
@Sgt Gus!
Keep an eye on it, note that if your shifts start becoming late and real harsh, that could be a sign of high line pressure, which is common in these units as they wear/age...A pressure test can quickly rule that in or out.
What about softer shifts? When I got the truck in 2012 it slammed into reverse, but not so much into drive, and it shifted softly and quickly. So I replaced the modulator valve, and have done a few drain and fills, one was because I inadvertently got the wrong filter, and that was maybe 2015 or later. When I installed it I saw material inside it. I later learned it was the dacron style, and after a few weeks I found the good filter. With the dacron filter I could here the pump, after swapping out the dacron it was back to normal sounds. But, the shifting isn't as pronounced as it used to be, and often when going from P, R, or N into D, D will slip. But, if shifted into 2 and back to D it'll usually operate fine. Shifting into 1 and then 2 it'll shift more solidly into 2, back not so much going into D. And if taking off from D (when it's operating like it should), 1 to 2 is soft, sometimes not noticeable, and sometimes it shifts quickly from 1 to D without feeling any shift at all.
Because of the issues with this truck over the years, I haven't driven it much, which may be part of the cause. Last night I poured some seafoam hydra trans tune in it, but I noticed that stuff is super thin. After I added the trans tune(about 2 miles from home), I went to a parking lot next to the house, and for about 10 minutes shifted back and forth from R to D without giving it any throttle most of the time. Since I was not consistent on the amount of time in R or D, I wasn't staying in the same area, so I did have to give it a little throttle to either go further back to avoid going into the street, or further forward to avoid hitting the fence. In R it engages strong, like it does when it's shifted into 1 or 2. On the occasions that I gave it more throttle in D to get away from the fence, it slipped and tried to engage more but never felt strong like the other gears.
When it's cold, and I have to sit at the light, I leave it in N and raise the rpms until the light turns green. If I just put it in D it'll slip badly, so I usually shift all the way into 1, then 2, and sometimes when shifting into D it'll slip, so I have to shift back into 2 and then to D. That usually engages D, but it has slipped before, needing another drop into 2 and back into D.
Do you think the trans is shot, or on its way out, or just varnished? I am certain it's all original, as everything I have taken apart has been the first time for this truck, i.e.: carb, shift linkage, resealing engine, etc. Last night I also changed the modulator valve to see if it helped with the shifting points and it did not. I have gone 2 turns in after installing the new modulator valve.
I hope you read this and can respond. If you need additional information, let me know. Thanks.
