Hello, I have had trouble with the C6 in my '79 Bronco creating a high frequency vibration as the vehicle accelerates. It also shifted too early and slips quite a bit. I have removed the transmission and disassembled it. I believe one cause of the vibration was a destroyed bearing between the converter and flex plate (there was only small ground up pieces of it left. The pump gears look good however the bushing in the center of the pump housing is chewed up. Is this bushing replaceable and is the one listed as " 36034
Bushing C6 pump body (babbitt)" the correct one? I'm following along with the badshoe video and have found a couple of other minor parts that need to be replaced and it needs a really good cleaning. Anything else I should be looking for?
It's actually the pilot bearing in the end of the crankshaft. In my mind I can see that the torque converter bolts to the flex plate and the flex plate bolts to the crankshaft so was there supposed to even be a bearing or bushing there like in a manual installation? I don't know but there definately was the remains of one when I removed it. Thanks for the #'s Stuart...
I disassembled the forward clutch. There is no bellview washer, no rear pressure plate and only 3 fiber and 3 steels with a thick forward plate. The lock ring groove is cut much lower than the ones I see in pictures and will not allow any more plates or a bellview washer in there. Is this forward clutch out of an e40d and installed to lower the gear ratio? Can I swap this hub for an original C6 unit by itself or are there other parts I need to replace with it? I have a 1975 truck C6 I can use for donor parts assuming they are in usable condition.
I'm an idiot... A head cold and lack of sleep had me fixated on the reverse drum instead of the forward one hidden under the bench. The forward drum had the bellview and wave plate and 4 fibers installed. All the fiber disks are black, smell burnt and worn thin. The steels have black spots on them as well. This transmission was supposed to have been rebuilt not many miles ago. The Bronco had 38" tires, and 4.56 gearing and was occasionally used to tow a boat by a kid just out of high school. That might explain most of the wear but I want to catch everything I can while it is torn apart. The intermediate piston was hard, could that have caused the slipping? It's going back together with new fibers and steels, new kevlar band, servo piston, and a new torque converter. Since vibration was an initial problem and new u-joints didn't change it I might replace the flex plate while I'm in there just to eliminate it. Anything else I can look for?
Sorry for the disjointed thoughts in this thread. Inexperience and a several month time span between pulling the transmission and getting to work on it have hindered me somewhat in describing issues and finding answers. The original problem was a pretty intense shuddering on acceleration (in drive) that would occur after it got going and was about to shift. It would also do this on deceleration again near the shift point back into low gear. This shuddering was bad enough to vibrate and shake the trim pieces on the dash panel. Replacing u-joints and playing with drivelines made no change. I took it to a transmission shop and let them drive it. This guy wasn't concerned with the vibration but pointed out that it was slipping and he believed it was shifting up too fast. Of course they wanted to overhaul it. I pulled it out myself and found lots of ground metal in the bell housing area. I can't find the source of this. It was not finely ground but not big enough to identify and was evenly spread all around the inside of the bell housing. I looked at the flex plate and inside the throat of the removed converter and cannot visually see anything notable. The intermediate servo piston is very hard. There was tons of finely ground metal inside the servo cover and the walls of the cover were scarred where the piston rides (I think the piston moving with metal under it caused this). When I sprayed out the cover and the servo housing a sea of finely ground alloy came out for several seconds. I didn't really find any other parts in the transmission worn enough to account for all this metal. The forward clutches were worn a little and measure about .072", the new ones are .075". The steels have lots of black marks on them, it may be that they were not replaced when the friction disc's were. Other than that the only other things I found were one pump gear installed with the bevel the wrong way, the pump bushing was damaged and some of the thrust bearings were evenly worn beyond the bronze colored coating. I am installing new friction disc's and steels, replacing the worn thrust washers, replacing the pump bushing, replacing the servo piston, replacing the torque converter and flex plate and all seals and gaskets. The governer and valve body will be disassembled and cleaned. I still have questions about the servo and lever. It has an N servo cover and an A lever - are these adequate for average use? If I replace the piston and fill in the scarring inside the cover with JB weld or similar will it work as it should? Anything else I can look for before re-assembly?
