Hi everyone, Before I dig into this unit, I'm posting a brief explanation of what's been done to it and what happened this weekend, in case anyone has thoughts on it. The trans lost 3rd gear about 3-4 years ago. The 2-3 shift was getting softer and I could tell it was slipping before it finally failed. I found the 3-4 clutch pack burned up and shot. I rebuilt it going to great lengths to make the 3-4 clutch as strong as possible. This includes using the pricey Sonnax input housing with the bolt on 3-4 backing plate. I also installed the pieces to maximize 3-4 clutch capacity. I installed an 8 stack of thick BW hi energy green clutches and thick steels.
The rest of the unit was replaced with new high test parts like a billet 2nd servo and Sonnax dual piston 4th servo. A new pump and Transgo 2-3 shift kit with some added pieces from Sonnax. I installed the unit with an Edge 3,500 10" converter. After the build, line pressure at 3,500 in 3rd gear was 285psi.
One weird thing that happened with this 3rd gear failure was the speedo had stopped working last week. I checked the cable and was going to check the drive gear to be sure it was turning before swapping a new cable in. Then, right at the same time 3rd gear left me, the speedo started working again. I'm suspicious of the drive gear retainer, that it may have come loose and gotten into the governor gear and locked it up.
I'll get the car into the shop later this week and check things out. A pressure test should tell me if this is a hydraulic issue. I'll pull the tail housing and check out the gov gear. The 3-4 clutch is tough to air test but I'll see what I can come up with. If anyone has any thoughts on this issue, post a reply. I'll take all ideas into account when I do the check out. Maybe the trans will be coming out again. Oh well, it's about due for a fluid change anyway.
The rest of the unit was replaced with new high test parts like a billet 2nd servo and Sonnax dual piston 4th servo. A new pump and Transgo 2-3 shift kit with some added pieces from Sonnax. I installed the unit with an Edge 3,500 10" converter. After the build, line pressure at 3,500 in 3rd gear was 285psi.
One weird thing that happened with this 3rd gear failure was the speedo had stopped working last week. I checked the cable and was going to check the drive gear to be sure it was turning before swapping a new cable in. Then, right at the same time 3rd gear left me, the speedo started working again. I'm suspicious of the drive gear retainer, that it may have come loose and gotten into the governor gear and locked it up.
I'll get the car into the shop later this week and check things out. A pressure test should tell me if this is a hydraulic issue. I'll pull the tail housing and check out the gov gear. The 3-4 clutch is tough to air test but I'll see what I can come up with. If anyone has any thoughts on this issue, post a reply. I'll take all ideas into account when I do the check out. Maybe the trans will be coming out again. Oh well, it's about due for a fluid change anyway.