UTfball68
Well-Known Member
- Joined
- Jul 18, 2008
- Location
- Granite Quarry
Last week the C6 in the Bronco started shifting extremely erraticly and sluggishly. And the hotter the ambient temp got and the hotter the tranny temp got, the worse the tranny got. I also noticed signs of a bad vacuum leak. The signs pointed to a bad vacuum modulator. I pulled the line to the modulator and had tranny fluid basicly all the way to the intake tree.
So I replaced the modulator. Vacuum issues went away. The 1-2 shift is perfect again. The 2-3 shift and WOT downshift is perfect again...until the tranny starts warming up, but the 1-2 shift remains perfect. Here again the hotter the outside air, the quicker the problem starts happening...and the warmer the tranny gets the worse the problem gets. And by 'problem', I mean letting off the gas to allow it to shift sometimes and other times it has a really sluggish shift. But when it's cool, the first 15-30 minutes everything is perfect.
I also noticed the 2-3 shift is happening a little later even when cold and I attribute that to the new modulator. I pulled a purple band modulator, so I replaced it with a purple band modulator. (My books stated a purple or black band would suffice)
The fluid level is correct. The fluid looks great and was completely replaced about 3 months ago. I didn't notice any kinking in the exposed tranny cooler lines, and it appeared I had good flow from the cooler outlet.
Any thoughts or suggestions? I would have thought if my tranny was going bad, it would be bad at all times and not just when it warms up. Any and all help is greatly appreciated.
So I replaced the modulator. Vacuum issues went away. The 1-2 shift is perfect again. The 2-3 shift and WOT downshift is perfect again...until the tranny starts warming up, but the 1-2 shift remains perfect. Here again the hotter the outside air, the quicker the problem starts happening...and the warmer the tranny gets the worse the problem gets. And by 'problem', I mean letting off the gas to allow it to shift sometimes and other times it has a really sluggish shift. But when it's cool, the first 15-30 minutes everything is perfect.
I also noticed the 2-3 shift is happening a little later even when cold and I attribute that to the new modulator. I pulled a purple band modulator, so I replaced it with a purple band modulator. (My books stated a purple or black band would suffice)
The fluid level is correct. The fluid looks great and was completely replaced about 3 months ago. I didn't notice any kinking in the exposed tranny cooler lines, and it appeared I had good flow from the cooler outlet.
Any thoughts or suggestions? I would have thought if my tranny was going bad, it would be bad at all times and not just when it warms up. Any and all help is greatly appreciated.
