"We Keep Up With Today's Changing Transmissions" Load MOD from Your Hard Drive Do you Mitchell on Demand running from the CD? Does it seem to operate slowly? Here are the instructions to setup Mitchell on Demand to run off of your hard drive rather than the CD. 4L60E TCC Reg. Bore Wear Tool You can make your own 4L60E TCC regulator bore wear tool, by sawing off a TCC regulator valve and then installing a piece of copper over the stem for a handle. Rebuilt 4L60E Service Valve Body The valve diameter of the TCC Regulator lineup in the SERVICE Valve body above is .473". Sonnax and OEM are .442". Make Your Own Custom Service System You can easily make this system yourself. It is made up of PVC pipe, and the different adaptors can be made in the lathe or you can grind them on the bench grinder. 4L60E Low/Rev Roller Replacement Look and Compare the Borg Warner and Aftermarket L/R Rollers for the 4L60E. There is quite a difference. Troubleshooting Code P1870 Here is a procedure that we use to decide if a transmission is worthy of repairing the TCC regulator system, rather than doing an overhaul. GM Power Relay Installation The Power Relay System was designed to eliminate DTC 66, 67, 81, 82, and 83 on 1995-up GM trucks. Take a look at the GM Power Relay System installed on a few different vehicles. 4L60E Reaction Shell ID How to identify the 4L60E reaction shell as one of the ones that is prone to early failure.Also, how to ID the updated & improved shell. Fixes of Possible Interest If you are an automotive technician, you have to check out these screen shots of common failures and fixes. Whether you work on transmissions or not, these photos are worth taking a look at.