collinmcmaster
Registered User
This is cross posted on another forum and without any helpful responses from the moderator there, I would not have any. So, I come to you guys!
I have an 86 F350 with a 6.9idi back by a C6 transmission.
Quick backstory: Torque converter went out, i personally rebuilt the transmission and put it back in. Unfortunately, i forgot to flush the cooling system while it was out. While the pan was clean when i took the transmission out, all the crap was in the cooling system.
Over the course of about 150 miles, I realized that it would shift great when the fluid was cold, and it would also have plenty of power in reverse. Once the fluid warmed up, it would seemingly start in 2nd gear or slip so bad it was hardly a noticable shift to 2nd.. 2nd to 3rd shift was always fine. In reverse with warm fluid, it would slip so bad i would have zero power, just wind up the motor.
Thats when i realized i didn't flush the cooling lines like I had planned.
I dropped the pan, changed the filter (it looked like hell and clogged after 150miles from the converter contaminant that was finally flushed through when driving), and flushed the cooling system (metal bits everywhere). The torque converter that I put in did have a drain plug but for some reason it is not accessible via the window. I have only put in valvoline dex/merc since rebuild. Dipstick says Dex2 for fluid.
The problem I am having after the fluid change (maybe 8qts worth) is the same, but VERY much less pronounced when in drive. Now when warm, i still get 'mostly' great shifts from 1st to 2nd from a stop everytime, but nothing like the first when the fluid is cold. Reverse is still very pronounced, where i have tons of power when the fluid is cold and i could back up a mountain it seems, once the fluid has warmed a tad, i couldn't back up an ant hill.
I did put a transgo shift kit in it, but some of the install instructions seemed confusing. It is the only part of the rebuild i have possible thoughts about. But i'm almost at a loss. Crap in the valve body? Too much bad fluid and contaminents still to get out?
I have verified the VRV is adjusted correctly, there is adequate vacuum at the modulator per spec, the governer is extremely clean ( i pulled it when i did the fluid change), and the 2nd gear band is per the book.
Any thoughts?
I have an 86 F350 with a 6.9idi back by a C6 transmission.
Quick backstory: Torque converter went out, i personally rebuilt the transmission and put it back in. Unfortunately, i forgot to flush the cooling system while it was out. While the pan was clean when i took the transmission out, all the crap was in the cooling system.
Over the course of about 150 miles, I realized that it would shift great when the fluid was cold, and it would also have plenty of power in reverse. Once the fluid warmed up, it would seemingly start in 2nd gear or slip so bad it was hardly a noticable shift to 2nd.. 2nd to 3rd shift was always fine. In reverse with warm fluid, it would slip so bad i would have zero power, just wind up the motor.
Thats when i realized i didn't flush the cooling lines like I had planned.
I dropped the pan, changed the filter (it looked like hell and clogged after 150miles from the converter contaminant that was finally flushed through when driving), and flushed the cooling system (metal bits everywhere). The torque converter that I put in did have a drain plug but for some reason it is not accessible via the window. I have only put in valvoline dex/merc since rebuild. Dipstick says Dex2 for fluid.
The problem I am having after the fluid change (maybe 8qts worth) is the same, but VERY much less pronounced when in drive. Now when warm, i still get 'mostly' great shifts from 1st to 2nd from a stop everytime, but nothing like the first when the fluid is cold. Reverse is still very pronounced, where i have tons of power when the fluid is cold and i could back up a mountain it seems, once the fluid has warmed a tad, i couldn't back up an ant hill.
I did put a transgo shift kit in it, but some of the install instructions seemed confusing. It is the only part of the rebuild i have possible thoughts about. But i'm almost at a loss. Crap in the valve body? Too much bad fluid and contaminents still to get out?
I have verified the VRV is adjusted correctly, there is adequate vacuum at the modulator per spec, the governer is extremely clean ( i pulled it when i did the fluid change), and the 2nd gear band is per the book.
Any thoughts?
