4l60E flush

[Camar068]

My trans lines are cut and have rubber hoses on them. Would it be fine to feed IN new fluid outta one container and OUT old into another out of the other line?

Do this before or after filter change?

Also, thoughts on seafoam trans before hand? I've been a believer of seafoam since a few engines and a 15 yr old walmart weedeater felt like it was gonna blow up cuz I never heard it run so fast after 2 caps of it lol.

When it comes to transmissions tho, I've been afraid to try it.

Thx In Advance

 

[CalSgt]

The “in” or return line from the cooler doesn’t have suction to pick up the clean fluid. The fluid in the return line just drains into the transmission as it’s pushed by the fluid that’s pumped to the cooler in the feed line.

Drop the pan
Replace filter
Clean and inspect pan
Replace pan
Refill through the dipstick tube
Route the cooler return line into a bucket
Make sure your in Park
Start the truck for a few seconds while a helper keeps watch on the bucket
Fluid will flow from the cooler line
Shut it down and replenish with more clean fluid

Repeat the last two steps until fluid flows clean and red

Reattach cooler line
Check fluid level and add as needed

 

[Ricko1966]

The way I do it. Do your own,fluid and filter. Put on a pan with a drain plug. Drain and fill the transmission pan just use the drain plug and dipstick tube, leave the pan and cooler alone. Drain once a week for a month,then every other oil change.

 

[Old Guy Bill]

They used to make a flush spray can for the lines and cooler, it had a fitting for the line. You emptied the entire can to clean any debris out of
it, wasn't for the entire trans & converter though.

 

[TotalyHucked]

I'm a firm believer in NEVER flushing an auto trans unless you've had it since new and been doing it on a regular interval. EVERY. SINGLE. person I know that's had a 4l60 or anything else flushed was doing a rebuild soon after. All I do is drop the pan, change the filter and top it back up, I've never had an issue.

 

[DoubleDingo]

In my years on the round ball flying through space, I am guilty of, and have observed others do the same, interchangeably using "Flush", when they really mean "Drain and Fill".

Yes, the OP did ask about using the cooler lines to recirculate fluid into the transmission, and I guess that is technically a flush, as opposed to simply draining and filling to achieve new fluid in the transmission and torque converter.

If the pan has a drain plug, it's easy to drain and fill. If not, use a pump extractor and suck out the fluid through the fill tube. I did this on my Tahoe and it worked great.

I did 3 gallons on a Sunday afternoon.

Pumped it out, filled it back up, idled the engine for about 10 minutes while shifting through the gears, rinsed and repeated until 3 gallons of new was coursing red through the system. Went from burnt red color to vibrant red. I haven't had the chance to change the filter, but when I do, it'll get a fluid extraction, pan drop, filter change, new gasket, topped off, and ran. This is on my soon to-do list.

 

[Camar068]

In my years on the round ball flying through space, I am guilty of, and have observed others do the same, interchangeably using "Flush", when they really mean "Drain and Fill".

Yes, the OP did ask about using the cooler lines to recirculate fluid into the transmission, and I guess that is technically a flush, as opposed to simply draining and filling to achieve new fluid in the transmission and torque converter.

If the pan has a drain plug, it's easy to drain and fill. If not, use a pump extractor and suck out the fluid through the fill tube. I did this on my Tahoe and it worked great.

I did 3 gallons on a Sunday afternoon.

Pumped it out, filled it back up, idled the engine for about 10 minutes while shifting through the gears, rinsed and repeated until 3 gallons of new was coursing red through the system. Went from burnt red color to vibrant red. I haven't had the chance to change the filter, but when I do, it'll get a fluid extraction, pan drop, filter change, new gasket, topped off, and ran. This is on my soon to-do list.

I'm not getting it.....are you saying I can pull the pan and ALL the fluid is changed? My understanding is about 6 qts of fluid is changed.

Thx Dingo

 

[DoubleDingo]

Pan removal does not remove all the fluid. The pan only holds so much, torque converter holds a bunch. So there will be a lot of old fluid left in the system.

With all the different responses to different methods, you got this.

 

[Jrgunn5150]

Drop the pan, change the filter, party on.

It's really all that was ever intended, and more than most ever do right up to 300,000.

 

[TotalyHucked]

Pulling the pan usually drops ~2-3qts out