C6 Transmission Shudder

Usually a shudder like you mention comes from the torque converter. A tranny shop can swap it out but it won't be cheap because they have to pull the tranny to get to the converter. I'd guess in the range of $500 or so. If the tranny has many miles on it you'll be dollars ahead if you have them rebuild the tranny while they have it out.

Ron

a shudder from the converter is a problem in lock-up converters, which are not used in the C6

You may have a problem with the splines of the driveshaft yoke or the slip joint between the two halves. It may be corrected by cleaning and lubing the splines with a good EP lube. A bad U Joint can also do this. A bad U joint may not be paritcularly loose but is galled or seized internall such that it does not move freely under load. Make sure the drive line U joints and splines are all in good condition before the trans is condemned. BTW, a C6 torque converter is not a lockup type and will not shudder among the problems it may exhibit.

Thanks, I'll give a little grease to those and see what happens. It'd be great if that was the cause. The u-joints are good, tho, just had the shafts out and replaced two.

Thanks to all you FordFolk for answering. I'll get back with how it turns out.

-mikey

Mike, I'd say you're more than likely experiencing old age syndrome and hardening of the seals on that C-6. Is there any delayed engagement when cold? You might try a half pint of brake fluid in it to soften the seals a bit. But it's only temporary. Once they start delaying and shuddering, you're usually headed for an overhaul.

You did right to phase them. The only problem is you can be half a turn off of where it was when it was balanced. If it seems smooth at highway speeds, you probably got it the way it's supposed to be.

Glad you got it fixed.!

Please explain "to phase" thanks !!

transmission.