Hard shift
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
First things to check (do you have any DTCs in the DIC?)
When was the last time that you checked the fluid level of the trans?
BC
When was the last time that you checked the fluid level of the trans?
BC
Last edited by Bill Curlee; Feb 21, 2016 at 08:43 AM.
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
I would say that it has engine mods and possibly still has the stock torque converter. With higher RPM's needed for idle speed it would cause the car to go from Park to Drive hard. Do you have a list of the things done to the engine and driveline?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Also, you could have a Torque Tube bushing issue if there is any noise related in and between shifts.
BC
BC
Last edited by Bill Curlee; Feb 21, 2016 at 08:45 AM.
Racer
Joined: Apr 2013
Posts: 253
Likes: 3
The 1998 C5 uses the 4L60E transmission. These transmissions used a variable force motor to control pressure. If the solenoid has failed or if it's unhooked, it will default to maximum line pressure. This will cause a firm engagement and firm shifts. There are also various codes that will cause it to default to maximum pressure. Pressure is also able to be raised through the tune. Is it possible that it's been raised? As already mentioned, this could be too much play somewhere in the drivetrain as well. The best place to start is to pull the codes. If there are none, I would put a pressure gauge on the trans to confirm what the pressure is.
