Hi,

We've recalibrated a Saab 9-7X with the Gen IV Vortec 5300 LH6 V8 and the 4L60-E (M30) transmission to run on European fuel, and have also played around a bit with the shift points and pressures.

According to the specification from GM (see enclosed specification sheet), this transmission should be able to handle shift speeds up to 6200rpm 1->2 and 6100rpm 2->3. However, when shifting at more than about 5500 at WOT, there's a funny whooshing sound (sounds a bit like the pop-off valve on a turbocharged car…) as the higher gear is engaged. Our guess is that this is a valve or something having problems, but we cannot observe any slip. Does anybody know what this could be, and if it would be a cause for concern? This noise is also present with the stock software, but the noise is not so loud. Changes in shift pressure or torque reduction don't provide any noticeable improvement.

We checked the transmission oil filter, and found some minor clutch residues and metal filings - see enclosed images. How much dirt is normal?

We tried running the TCC closed on WOT. The dyno performance is improved, but we are concerned about the TCC slipping when running this set-up long-term. Is there a way to monitor the TCC slip with the VCM Scanner for this transmission?

We are unable to get the downshift 2->1 on WOT to go higher than 59km/h – higher values are simply ignored. For the 3->2 shift any values are readily accepted, but then again, we have not moved this shift point much. Could the VCM Editor perhaps be missing an RPM shift table for the downshift?

Cheers,

Erik