1986 700r4 trans. fluid flush
#1
1986 700r4 trans. fluid flush
going to flush my tranny. easyest way to disconnect line is from upper cooler connection? or is their an easier fitting to use? 1986, 700r4 trans.
#3
Do this ^^^ and you could later extract the tranny fluid after running it for a while. I'd say you would change 90% of it. There's some pretty reasonable extractors out there or you could make one.
#4
#5
Team Owner
Have you tried a place that does oil changes? See if they have a flush machine? I wouldn't think that it can save the tranny if it is toasting but it can stop it from going worse as fast as if you did nothing.
#6
700r4 trans flush
what I really wanted to know if anyone has done it before,and is the upper line the right place to disconect. or, is there an easier place to discharge the fluid? I already changed the filter.
#7
In my experience with GM tranys, the lower cooler line is the inlet for the cooler. I'd make up a piece of line with a flare to hook up to the upper cooler connection. Get some rubber or nylon hose and run that to a bucket.
Be ready to dump a gallon of atf in when you start it.
Be ready to dump a gallon of atf in when you start it.
#8
Melting Slicks
Earlier this year on my 86 a 1 time pan drop and filter change was all that was needed. I have been all over the US with it this year and the trans shifts beautiful.
#9
I believe that if you feel you've potential issues the second dump, filter and fill will do.
A DIY flush for a novice has maybe a few challenges such as twisted cooler lines and destroyed flare nuts and on and on, could prove very costly. Many might not do the 2nd filter
You've never mentioned the miles, haven't mentioned if the car has been driven since the 1st filter change so maybe it's important to mention both, miles on car and driven since filter/fluid.
#12
I have never done a auto trans fluid flush on a Vette - but I have used a very similar process to what you describe on my K3500 with a 4L80E tranny.
Dumped the pan and filled with new fluid. Disconnected one line at the cooler - and started the engine. Killed the engine when I saw the first sign of bubbles in the tranny fluid - refilled pan - repeated process three times - at that point the fluid coming out was pretty darn close to new looking.
One post I saw felt that the fluid returning to the tranny from the cooler did some lubricating, and that it would have been better to have a person continually adding fluid to the car while the cooler line was disconnected. If I had a third person available I would have done that ...
Dumped the pan and filled with new fluid. Disconnected one line at the cooler - and started the engine. Killed the engine when I saw the first sign of bubbles in the tranny fluid - refilled pan - repeated process three times - at that point the fluid coming out was pretty darn close to new looking.
One post I saw felt that the fluid returning to the tranny from the cooler did some lubricating, and that it would have been better to have a person continually adding fluid to the car while the cooler line was disconnected. If I had a third person available I would have done that ...
#13
I have never done a auto trans fluid flush on a Vette - but I have used a very similar process to what you describe on my K3500 with a 4L80E tranny.
Dumped the pan and filled with new fluid. Disconnected one line at the cooler - and started the engine. Killed the engine when I saw the first sign of bubbles in the tranny fluid - refilled pan - repeated process three times - at that point the fluid coming out was pretty darn close to new looking.
One post I saw felt that the fluid returning to the tranny from the cooler did some lubricating, and that it would have been better to have a person continually adding fluid to the car while the cooler line was disconnected. If I had a third person available I would have done that ...
Dumped the pan and filled with new fluid. Disconnected one line at the cooler - and started the engine. Killed the engine when I saw the first sign of bubbles in the tranny fluid - refilled pan - repeated process three times - at that point the fluid coming out was pretty darn close to new looking.
One post I saw felt that the fluid returning to the tranny from the cooler did some lubricating, and that it would have been better to have a person continually adding fluid to the car while the cooler line was disconnected. If I had a third person available I would have done that ...
#14
Team Owner
And exactly why do you want to do this instead of farming out this messy crap?
#15
BUT - my main reason was that while there are some "local" Independent shops that I use and that I have had very good luck with - most of them don't have the flush machines, and the majority of places that have the machines - I just don't trust !!!
#16
Instructor
Trans Flush
Years ago, I attended a seminar held by Gordon Killebrew on maintenance and repair of the C4.
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John
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#17
Pro
Years ago, I attended a seminar held by Gordon Killebrew on maintenance and repair of the C4.
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John
#18
Team Owner
I obviously can't speak for the OP - but in my case - the job wasn't too horrible - the 4L80E pan has a drain plug - so I was able to avoid getting old trans fluid all over myself - and while the pull the line off the cooler part wasn't a ton of fun - it was a lot less of a PITA than doing even one bank of spark plugs on an LT1 - C4.
BUT - my main reason was that while there are some "local" Independent shops that I use and that I have had very good luck with - most of them don't have the flush machines, and the majority of places that have the machines - I just don't trust !!!
BUT - my main reason was that while there are some "local" Independent shops that I use and that I have had very good luck with - most of them don't have the flush machines, and the majority of places that have the machines - I just don't trust !!!
#19
Advanced
Transmission drain
Years ago, I attended a seminar held by Gordon Killebrew on maintenance and repair of the C4.
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John
One of the tips he gave us was flushing the Trans.
You'll need 12 quarts of new fluid.
Disconnect the upper trans cooler line on the radiator. (Upper passenger side of the radiator) Connect a tube to the line, into a large drain pan.
( I use 3/8" ID clear tubing from Lowes)
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Put 4 qts fluid in Trans.
Start the car, run it until it spits, shut car off.
Reconnect cooler line to radiator.
Put 3 qts fluid in trans.
Start car, at idle, without moving, shift into all gears, then into park.
Top off with last quart of fluid.
You've just changed every bit of fluid in your trans.
Easy.
Regards,
John