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Posted on Jan 02, 2017
SOURCE: 1997 Chevy pickup
It is a very common issue If you have a 4L60E, you may have a problem with the valve body. As the valves bores get worn hydraulic pressure is compromised, there are fixes out there for this transmission, check out www.sonnax.com they have many parts to help resolve the transmission of these problems. Also you should check or replace your separator plate as sometimes the check balls that regulate the hydraulics of the transmission become stuck onto the plate. I've done quite a few of this model transmission and its almost always the valve body problem. HOWEVER FIRST CHECK YOUR FLUID CONDITION, if the fluid is good and there isn't a large amount of debris in the pan you should try to either get a new valve body or have your rebuilt with the parts from sonnax that eliminate these hard shift problems.
Posted on Aug 31, 2008
The Buick (GM) Corp, has offically released this as an on-going problem with this style of tranny, but will not issue a recall. Basically, it can only be fixed by replacing the pressure valve within the tranny. This is a costly fix (400 to 650, depending on the shop). The pressure valve (over time) wears a groove between the valve cylinder wall and piston (of valve) which allows tranny fluid to bypass thru the line, thus causing the hard shifting, mostly when the tranny is hot and the fluid is thin. Trust me when I say, no other fix will work, such as changing tranny fluid, flush and fill, or any additives such as Seafoam or other tranny slip or fix additives. Bite the bullet and find a tranny shop which will give you a LIFE TIME warranty, mostly, in case they install yet another defective valve.
Posted on Mar 14, 2009
The trani is electronically controlled. without a diagnostic computer you are not going to know. It may be the speed sensors (for the trani.) but thats a guess. how long since the last trani service. Fluid level and condition can affect its perfomance. Good luck.
Posted on Apr 29, 2009
how it sounds that the solenoids are going bad i would take it back to the shop were you had it rebuilt and have them redo it most shops give a one year warranty on the rebuilds if so they should be able to fix it for free.
Posted on Jun 09, 2009
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