When I changed my oil, the (non-dealership) mechanic made me aware of a leak and suggested I take the car into the dealership Turns out that I had a small crack in the "housing" and they fixed it. The car only had 6200 miles on it. Haven't had a problem since (at least not that I'm aware of) and it now has 7K miles on it.

 

My transmission leaked. Problem was input shaft seal and the shift linkage seal. I also had the left o-ring on the differential leaking and had it fixed at the same time. I am convinced that the T56 just runs hot at higher speeds due to it's design. I think I am going to switch to a synthetic ATF, but still fear that the leaks will recur. Seriously considering transmission and differential coolers.

Take Care,

Alan

 

After the dealer took my transmission apart at around 1200 miles for popping out of gear, I developed a leak at the rear seal. It was only a small leak but when my synchro went out from 4th-5th, they fixed both at the same time.

 

C-5heaven:

I saw the article and that was what rekindled my driveline cooler interest. I talked to Bob at Fitchner Chevrolet and found out, after Bob warned me to sit down and bit my tongue, that the GM Performance Part Cooler retails for $1029 and Bob sells it for $875. Too rich for my blood, especially since it would require 2 if I wanted to cool both the Tranny and Diff. I then sent an email to DRM and never heard back on thier pricing and options.

My current thought is to fabricate my own. Problem is the location. I am not too wild about running oil lines the length of the car as the GM unit does. There is minimal room in the rear and airflow over the cooling coils would be an issue unless I used cooling coils with fans. My current feeling after staring at the underside of the car for a few minutes is to get a pair of the Z06 rear brake cooling screens and use them as the air supply not only for the rear brakes, but also to mount the coolers and pumps in the rear section of the rocker panels. I haven't taken them apart yet, but it looks like there should be room if nothing else significant is hidden in there. I will have to think about airflow volume, but my guess is that it will be O.K. Then it is only a matter of locating the few components required. Pumps, hoses and fittings, relay, temperature switch, and wire. I figure the major expense is a couple of quality pumps and the Z06 screens. Should be able to produce both cooling systems for just over half of the price of a single GM setup.

Just thinking out loud.

Have we met at any of the Atlanta Forum gatherings? :cheers:

Take Care,

Alan

 

Last fall I had the transmission rear seal and the complete adaptor (suppossedly porous) replaced. Also, the left sell on the dif.

This year (two weeks ago), the front transmission seal, the rear transmission seal the gasket on top on the reverse lockout solenoid and the left seal on the diff.

When it was apart, it was plainly obvious that the bearing on the tip of the counter shaft was trashed. All the needle bearing very very rough and one had a bif goiuge out of it.

Are you saying that all these problems are a result of heat build up in the transmission? That is tough for me to believe.

 

Steve:

No. The porosity I would not attribute to the heat, rather to a faulty alloy manufacturing process. My position is that the transmission runs hot due to it's design, this is not only my opinion as I have heard it from others. Also consider that the Z06 has a transmission warning indicator. When run hard it indicates. Why would GM go to all the trouble to show this if there was not a reason? Heat is the enemy, it causes seals to leak, harden, fail, bearings to wear or burn, cases to expand and contract which also encourages leaks. I am simply saying that I believe that heat is a major factor in rearend and differential leaking in the C5 and I am considering coolers to combat this for times of extended driving pleasure.

Take Care, :)

Alan