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Unfortunately no one has, or is, developing any badly needed upgrades for our stock transmissions. My 95, that I've owned since 1996, has lived almost all its life at the 520 to 560 whp range without any transmission issues. All that changed within the past year. I must have crossed some line, because now, at 760 rwhp and 730 ft lbs torque, I have damaged the input shaft bearing on a new 98 Jspec, and now, on my proven stock transmission, despite never launching it. Both are now whining like little girls in first, second and third, and getting worse. As there are no upgrade parts that I can find anywhere, I don't know what to do. Any suggestions, besides a 10K plus upgraded T56 kit?
The whine in both transmissions developed after a few 100 miles, despite never hard launching. I don't do any stop light runs, I only do roll runs on the highway, but I guess even that is more then the transmission can handle at this power level. The "go to" transmission shop here in Houston is Yates Garage. I took my Z to them so they could hear what was wrong. Their best guess, without pulling it apart, is that the input shaft must be flexing some and binding the bearing, causing it to fail. As they put it, properly designed and produced bearings don't just fail. Failure is caused by either poor lubrication, contamination or binding. Mr. Yates, the owner, called me a few days later. He told me that he could not find any information as to what exactly is causing the problem, much less any upgraded parts to fix it. The best he could do was "fix" it with stock parts, which of course is not going to actually fix the problem. But he's fairly sure the bearing itself is not the problem, it's just the part that the problem is causing to fail. Does anyone know if the T56's Merlin offers have been built or are stock? I ask because when I brought up the T56 to Mr. Yates that's what he asked me. He said he's rebuilding/upgrading two to three T56's a week that are unable to handle even mildly modified Z06's. As he put it, "You'll tear up a stock one in no time." I HATE problems with no viable solutions.
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18:22:39 07/02/23
