Automatic gear shifting
Thread Starter
Intermediate
Joined: Jul 2000
Posts: 46
Likes: 0
From: Ontario, Canada
Automatic gear shifting
I just changed the fluid and filter on my 86 C4 automatic transmission. Now, when I start driving the auto shifting is delayed until about 3200 RPM and then upshifts like a kick in the butt. After driving for ten or fifteen minutes the shifting becomes more normal and smooth. I've never had any drive problems before. The fluid level is correct.
Could I have caused this in installing the filter and its seal?
If the sealring on the filter neck wasn't properly seated what would be the consequence?
[Modified by Angusd, 3:16 PM 5/23/2004]
Could I have caused this in installing the filter and its seal?
If the sealring on the filter neck wasn't properly seated what would be the consequence?
[Modified by Angusd, 3:16 PM 5/23/2004]
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Re: Automatic gear shifting (Angusd)
A poor seal at the filter neck would cause it to suck air but whether or not that could cause your problem, I don't know. You could have a sticky valve. If it continues get a pint of Berryman's Chemtool B-12, follow the procedure for A/Ts and then repeat your fluid change.
Instructor
Joined: Apr 2004
Posts: 240
Likes: 0
From: St. Louis MO
Re: Automatic gear shifting (Angusd)
Did you make sure you got the old rubber ring out of the tube off of the old filter. The new filter should have had this same peice on there?
When I did mine, the rubber peice got stuck up in there and I had to use a pick to get it out. Just a thought.
When I did mine, the rubber peice got stuck up in there and I had to use a pick to get it out. Just a thought.
Pro
Joined: Oct 2002
Posts: 586
Likes: 0
From: Schmuckville SA
Re: Automatic gear shifting Angusd)
:iagree:
I dont think the pan will go on with the old seal in there but this could be the case here
and its definitely worth checking it out. When you say normal, does it shift like it should
or is it just slightly better? Maybe your throttle cable is out of whack...Maybe...
I dont think the pan will go on with the old seal in there but this could be the case here
and its definitely worth checking it out. When you say normal, does it shift like it should
or is it just slightly better? Maybe your throttle cable is out of whack...Maybe...
Drifting
Joined: Feb 2003
Posts: 1,292
Likes: 0
From: Beavercreek OR
Re: Automatic gear shifting (Angusd)
I've seen some posts on this in the past. There was a lot of people who said that if you don't know the maintnace history of the tranny, and it has not been serviced at regular intervals that putting in new fluid can take the tranny out :eek:
I hope that will not be the case for ya and that it's something simple. But the fact that it returns to normal shifting when it gets warm is kinda :skep:
I hope that will not be the case for ya and that it's something simple. But the fact that it returns to normal shifting when it gets warm is kinda :skep:
Thread Starter
Intermediate
Joined: Jul 2000
Posts: 46
Likes: 0
From: Ontario, Canada
Re: Automatic gear shifting (Corvette Kid NC)
Thanks for the input. When I changed filters I extracted the old seal with a pick, but the new seal is one of those orange colored three lip rings and is quite stiff. I pushed and wiggled the filter to get the seal to seat, and I got the filter in far enough for the pan to seat...but I'm not totally sure that the sealring is properly installed.
I'm tempted to pull everything off again to recheck. that is why I wanted to know what kind of reaction a poor seal would have on performance.
The reason that I changed the filter and fluid was that I had a leak at the gasket that tightening bolts did not help. I removed the pan, straightened the pan flange where it was belled at several front bolt holes and reinstalled it with a new filter and gasket....In addition to the changeup problem, the darned thing still leaks.
I'm tempted to pull everything off again to recheck. that is why I wanted to know what kind of reaction a poor seal would have on performance.
The reason that I changed the filter and fluid was that I had a leak at the gasket that tightening bolts did not help. I removed the pan, straightened the pan flange where it was belled at several front bolt holes and reinstalled it with a new filter and gasket....In addition to the changeup problem, the darned thing still leaks.
Thread Starter
Intermediate
Joined: Jul 2000
Posts: 46
Likes: 0
From: Ontario, Canada
Re: Automatic gear shifting (88vettelover)
Thanks for the input. When I changed filters I extracted the old seal with a pick, but the new seal is one of those orange colored three lip rings and is quite stiff. I pushed and wiggled the filter to get the seal to seat, and I got the filter in far enough for the pan to seat...but I'm not totally sure that the sealring is properly installed.
I'm tempted to pull everything off again to recheck. that is why I wanted to know what kind of reaction a poor seal would have on performance.
The reason that I changed the filter and fluid was that I had a leak at the gasket that tightening bolts did not help. I removed the pan, straightened the pan flange where it was belled at several front bolt holes and reinstalled it with a new filter and gasket....In addition to the changeup problem, the darned thing still leaks.
I'm tempted to pull everything off again to recheck. that is why I wanted to know what kind of reaction a poor seal would have on performance.
The reason that I changed the filter and fluid was that I had a leak at the gasket that tightening bolts did not help. I removed the pan, straightened the pan flange where it was belled at several front bolt holes and reinstalled it with a new filter and gasket....In addition to the changeup problem, the darned thing still leaks.
