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Change atf or not?

countryguy1717

By countryguy1717
in Engines & Drivetrain

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diyer2 Senior Enthusiast

diyer2

Posted
Posted

Here I go again, I change fluids more often than the severe schedule. It has served me well, my 93 Silverado trans went 250k, my work truck, not easy duty. 

Then I switched to Amsoil OE products, worth the cost to me. 

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lizard-navy-keep New Member

lizard-navy-keep

Posted
Posted

late to this thread but yeah replace ATF.  you have nothing to lose.  

 

bought my truck with 5 miles and around 19k the 6l80 acting goofy.  called dealerships to utilize my precious warranty and got told transmission guys are backed up 6 weeks and i'd have to leave the truck and no loaner.  After losing my previous truck to the 6 speed rumble strips i started swapping out a gallon atf every 6 months and added the thermal bypass.  

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diyer2 Senior Enthusiast

diyer2

Posted
Posted

I think you are starting this fluid change late, good luck.

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Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted
4 hours ago, diyer2 said:

I think you are starting this fluid change late, good luck.

He might be, but I have seen good results from customers that started this late so there is hope.

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Atlas Senior Enthusiast

Atlas

Posted
Posted (edited)

Why not drop the pan, change the filter, and do a couple of successive drain/refills while it's warm (thermostat open, if still equipped).

 

It's not that hard, or expensive, and accomplishes replacing 95% of the fluid at once.

 

 

It's like when people do this with power steering and use a little turkey baster to suck a little bit of fluid out and replace it with new over several oil changes. Jeebus... Pop the dang return line, hang it into a pan, plug the reservoir and have someone keep it full with new fluid while you crank the wheel lock to lock (with the engine off). It takes 10 minutes to do, and then you're done, completely flushed the system with clean fluid which should be good for another 20-30k before you should change it again. Hang a power steering filter on there for a gold star/ bonus points.

Edited by Atlas
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  • 1 month later...
MikeBMW Senior Enthusiast

MikeBMW

Posted
Posted (edited)

This may come back to haunt me, but I've had my truck in every 5000 miles for a drain and refill, with filter, on the transmission - never a transmission flush.
Along with the fix from Chevrolet TSB 21-NA-199.pdf, no issues with 98K so far.

Edited by MikeBMW
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