Sonnax 700R4 77998-03K Pinless 1-2 Accumulator Piston 200-4R 700-R4 Transmission
New billet aluminum pinless 1-2 & 3-4 accumulator piston. In these transmissions, it is common to have poor shift quality, burnt bands or clutches due to accumulator piston wear. Repeated reciprocation of the accumulator piston causes wear at the piston pin bore interface.
Borg Warner 700R4 29 Element Forward Sprag 700-R4 4L60 GM Automatic Transmission
This double cage unit is the strongest available. This sprag will increase your torque capacity in all forward gears. 700R4, 4L60. Borg Warner.
700R4 .500 Boost Valve & Sleeve Sonnax 700-R4 2004R 200-4R 4L60 O-ring Style TV
NEW .500 boost valve for the 700-R4 (4L60) and 200-4R Sonnax Part Number 77917-500 This valve has been machined for O-rings to prevent leakage in the bore of the pump. This will significantly increase the benefit you’ll get from the .500 diameter valve, especially in higher mileage transmissions where there is a lot of wear in the bore. This valve is a must for any performance, towing, RV/off-road application, but would be a nice upgrade for any 700-R4 or 200-4R. This valve will give your transmission the extra line pressure you need to keep from burning it up under heavy load situations. This valve will install just from inside the transmission pan. This valve will not fit the 4L60E. If you’re looking for a boost valve for that transmission I do have these listed as well.