30-40 mph shudder, any ideas?

[96jeff]

The exploder shudders from 30-40 mph, not to violently, but enough to be annoying and slow down acceleration. Probably about two months ago I had the same problem, so I changed the fluid. Car drove great (no shudder) for about 2 weeks and came back. Any ideas on what it could be? For some reason I have gotten in my mind that it is torque converter, but I really have no idea. Other than the shudder the car runs great. Thanks in advance!

 

[Glacier991]

Shudder usually occurs when there is an issue either with the fluid properties or there is inadequate pressure to properly engage a clutch. The torque convertor clutch is a common location where it occurs.

I will assume you used Mercon V when you changed fluid. (If not, do the change again using Mercon V)

The first thing you can try is a friction additive. Lubegard green comes to mind. If for some reason it is the fluid and you started with Mercon V I'd try that next.

If you still have shudder I'd probably suggest you check the pressures.

It's quite possible that your issues are VB related.