I have 68 k miles on my 2007 GMC Canyon. How do I change transmission fluid

[blutoadmirer]

without causing problems? I've been told that sometimes after the original fluid has been in there for a while, that a fluid change could cause transmission problems. I currently have absolutely no tranny issues. I wish to do a tune-up myself (change filter, drain it, add new fluid,etc.) I'm wanting to know what all I can and should do to tune it up but not cause troubles.

 

[Molson02536]

without causing problems? I've been told that sometimes after the original fluid has been in there for a while, that a fluid change could cause transmission problems. I currently have absolutely no tranny issues. I wish to do a tune-up myself (change filter, drain it, add new fluid,etc.) I'm wanting to know what all I can and should do to tune it up but not cause troubles.

Your better off getting a transmission shop to service your transmission filter and fluid. Just make sure that they DO NOT FLUSH YOUR TRANSMISSION.

Just have them drain the old fluid and replace the transmission oil filter and also replace the boost valve every transmission service. The boost valve is only around $50.00 at most shops and take an extra 5 min to replace.

After your cost of transmission oil and filter and the time it's going to take you to service the transmission, your better off as mentioned to have a shop do it. Average price is $100.00 and about $165.00 with the boost valve replacement.

Pressure regulator & reverse boost valve and sleeve: The reverse boost valve and sleeve in the pump should be replaced every 40,000 miles (65,000km) to avoid damage to the transmission. Damage can occur when wear in the boost sleeve causes insufficient line pressure in reverse. Many major repairs of the 4L60E at around 50,000 plus miles are because of the boost valve and sleeve. The valve and sleeve can be replaced easily during a routine service of the transmission for around $50. This should be considered a necessary procedure if you are transplanting one into your car. Oversized (0.490" versus the stock 0.470" or 0.420") reverse boost valves are available that provide a moderate increase in pressure, and are a good addition to any 4L60E.

As well, the pressure regulator valve (located under the reverse boost valve) should have two small 'flats' (~3/16" wide) ground on the second land - counting the lands from the end opposite that spring seat (or alternatively it should be replaced with an updated valve that has these flats).

http://www.sonnax.com/instructions/HP-4L60E-01-IN.pdf

Good luck and hope this helps.