The 700R4 Transmission, Chapter 2

ATTENTION ! ! If you are going to rebuild a 700R4/4L60, even if you know what you are doing, you MUST watch and follow the instructions in a series of YouTube videos produced by Transmission Bench. http://transmissionbench.com/4L60Evideos.html). They are more than thorough in a successful build. Now here's what happened: After about 600 miles, all of a sudden I heard a clunk and grinding and about 5% forward force. Coasted back home, jacked her up, removed the transmission, and disassembled it.

A few weeks ago, as I was headed to Round Rock to see a new buddy of mine who has a '62 Cadillac (HUGE), I got stuck in traffic in 100 degree heat. At about the same time, I noticed that I had lost 4th gear on the transmission. I pulled into Advance Auto and checked the trans fluid level. It was low. (Later found out I had a leak at the trans cooler behind the grill, and the leak only occured while driving). Anyway, since the fluid was low, I threw a quart in, but still no 4th gear.. Turned around and drove home. After the modifications I made to the cooling system (See the Gallery named "Under the Hood Modifications", scroll all the way down). In any case, I posted some questions on The H.A.M.B and Hotrodders.com, and got some concenses on the fact that the 2/4 Servo is subject to o-ring leakage, and since I noticed/thought that the Corvette servo in the trans seemed a bit loose when I rebuilt it, I decided that I would go "full blast" and upgrade the servo system to a Sonnax 2 and 4 Servo Upgrade Kit. So here it is. BEAUTIFUL ! It has double o-rings and D-rings to seal it, and the piston diameters are even larger than the Corvette Servo. You can't get a more powerful (pushing force) on the pin to clamp the band on the drum than this servo.
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TEN sealing rings!
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