6T75 Archives - Transmission Digest
GM 6T70/75/80 (Gen. 1 & 2) Jig Plate

The new plate can be used with both Gen. 1 and Gen. 2 oversized actuator feed accumulator piston kits.

GM 6T70/75/80 (Gen. 2) Oversized Actuator Feed Accumulator Piston Kit

The new oversized actuator feed accumulator piston kit re-establishes correct clearance for revived shift control in all ranges.

GM Gen. 2 6T70, 6T75 and 6T80

Critical Wear Areas & Vacuum Test Locations

Valve body – GM Gen. 2 6T70, 6T75, 6T80 – Vacuum testing

Critical Wear Areas & Vacuum Test Locations
NOTE: OE valves are shown in rest position and should be tested in rest position unless otherwise
indicated. Test locations are pointed to with an arrow. Springs are not shown for visual clarity.
A low vacuum reading indicates wear. For specific vacuum test parameters,
refer to additional information available at www.sonnax.com.

Trading Places

Most builders swapping hard parts have learned that mismatching drive components in a transverse unit will result in a host of negative consequences. The wrong ratio sprocket(s) or carrier can result in TCC and ratio codes, along with converter and unit clutch slippage. Unfortunately, optional ratios aren’t exclusive to the final drive; they can exist in the valve body as well.

Vacuum Testing GM 6T70, 6T75

From the TASC Force we reprint a series of in-depth test instructions for checking the serviceability of valve bodies.

6T70/75 Converter-Pilot Issues

To date most of the converters seen at converter-remanufacturing facilities have had vibration and/or leak complaints. After taking a closer look at the attachment between the pilot and cover, it is easy to see why (Figure 2).