Join Date: Apr 2003
Location: Long Island, NY
The pinless pistons are good units but I recomment getting a replacement stock piston because they are known for wearing out where the pin goes thru them, transgo sells a good replacement piston, instead of using the stock piston seals get a set of viton seals, it includes all the piston seals and servo seals. Its a good idea also to replace the servo seals with these viton seals. ive seen a few trannies already having the same symptoms as yours and it turned out to be bad servo seals. The checkball theyre talking about replaces the pin in the accumulator housing so fluid dont piss out of the top of it. its simple just use a punch to pop out the pin thru the top, and press the ball in and stake the housing around the ball to hold it in. Transgo sells a sk4l60e or 4l60e hd2 shift kits that i highly recommend doing if your gonna go that far. providing your mechanical know how. its not bad to do. the hd2 kit comes with vb
gaskets and all the springs and valves necessary to do the job. you will be very happy with it. how many miles on the tranny? feel free to ask more questions.
Ive come to learn a lot about the 4l60e lately because i went thru 3 trannies from an old vendor on this forum in 1 year, and decided to rebuild my own with a lot of upgraded parts and electronics, and so far so good with it.
Caprice 9c1, EFI Connection 24x conversion tuned with HP Tuners by me. TFS 185cc heads, 58mm Holley tb, 1 7/8 pro series stainless headers and 3 inch CIA Spintech exhaust, 4:11 gears, Trutrack posi, 1.6rr Ultra pro Magnum rockers, GM 847 cam, Aeromotive 340 fuel pump, #42lb injectors, Aeromotive FPR, Meziere electric wp, Magnecore 10mm wires, Garys cables and harnesses. Black Cloud Transmissions build 4l60e, Yank SS3600 converter.