Weird C6

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Jul 14, 2006 | 08:25 PM

Renzen

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Weird C6

Ok so I changed out my filter and fluid for my old C6 a few weeks ago. Prior to changing them the tranny shifted fine. Not awesome.....but pretty good. After changing parts the transmission will not shift into second or third under normal driving conditions. It will manually shift from first to second but when you tilt it up to drive it's like putting the truck into neutral. However if you floor the gas the truck will shift through all gears albeit very harshly. I've checked the fluid levels and made sure I removed all the old seals and rings and I've installed the filter correctly with rings. So what could I have done wrong? I need some help gurus. Thanks in advance.

Jul 14, 2006 | 09:33 PM

havi

I'll have the Roast Duck

Joined: Jul 2002

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From: Northshore, MN

check the vacuum line from the modulator to the intake.

Jul 15, 2006 | 09:05 AM

stuart1

Cargo Master

Joined: Jun 2003

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From: Somewhere Saskatchewan

What do you mean you installed the filter with rings?
There are no rings on a C6 filter, only a gasket.

Did you get the right length bolts in the correct holes?
Did you have the modulator out? If so did you install the pin?

Jul 16, 2006 | 12:13 AM

mark a.

Lead Driver

Joined: Mar 2004

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There is a lot to be said for the old statement "ain't broke don't fix it" My c6 has well over 350,000 miles on it and I've never even changed the fluid, only added once in a while. Knock on wood.

Jul 19, 2006 | 01:14 AM

Chiefrider007

Tuned

Joined: May 2003

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From: Southern IL

Sounds like you may have the internal shift linkage out of place if you removed the valve body or moved the shift lever. When you check the vacuum modulator on the rear make sure the rod is inside as well as a good vacuum.

Jul 19, 2006 | 07:19 AM

cujo8

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From: Williamson, NY

What type of Tranny fluid did you put into your C6? I've read that some year C6's use Type-F and other years used Mercon.

Jul 19, 2006 | 03:55 PM

mark a.

Lead Driver

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It seems to me I remember, maby it was Carl ? Saying here some time ago that if you just remove the filter, the valve body gaskets can start leaking and cause it not to shift. His solution was to always remove the valve body and put in new gaskets if you want to change the filter.

Last edited by mark a.; Jul 19, 2006 at 03:57 PM.