Editing TH700R4 through 4L70E tips and tricks (section)
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==Performance section== ===Kits for performance modifications=== '''TransGo''' seems to lead the market in quality kits. '''Superior Transmission''' brand products offer quality too. ===3-4 clutch pack=== The 3-4 clutch pack in these transmissions have been a problem area since production release in 1981. Clearance on the 3-4 clutch pack frictions should be in the area of 0.050" to 0.070". This can be adjusted via thin or thicker friction plates or steel plates. ===3-4 clutch pack kits=== *[http://www.raybestospowertrain.com/raybestos/images/stories/high-performance/broch_zpak.pdf '''Z-Pak'''] from '''Raybestos''' "is the patented, single-sided design clutch system that outperforms OE in torque and heat capacity without coning". *'''ALTO''' is the original manufacturer of Red Eagle® friction materials and Kolene® steel plates and Red Eagle bands. They offer a kit with single sided red friction material friction plates. Also available are "Commercial Duty" 3-4 clutch packs that allows up to 9 friction clutches and steels for the 3-4 clutch pack. These 3-4 clutch upgrades are considered a heavy duty upgrade and will save the transmission in the event of the governor sticking in 3rd gear. ===Boost valves=== In a 700R4 - 4L60 non electronic trans, you will want a 0.470" to 0.500" main boost valve. For the low-reverse boost valve a 0.282" or 0.296" works well. On the low-reverse boost valve, measure the long valve land for size. In a pre-1987 700R4 - 4L60 trans a larger low-reverse boost valve will hold off the auto upshift to 2nd gear while the shifter is in manual 1st gear. ===External cooler=== The key to longevity in any automatic transmission is to keep the fluid cool; therefore installing an external bypass cooler is recommended. The factory transmission coolers are an integral part of the radiator and will only cool the fluid in accordance with the engine temperature. Transmission fluid life decreases as temperatures rise above 160º F. An external transmission cooler will help to prevent ATF breakdown and torque converter "ballooning" or expansion which will cause (catastrophic) pump bushing failure. Use the largest external cooler that will fit and not block radiator airflow. If you don't use an external cooler, consider using a transmission temp gauge. It's just as important to let the transmission warm up before it takes abuse as it is to keep it from overheating. And, if you don't have an external cooler you'll have a great idea of when to take it easy on the trans. ===2nd gear Servo=== Photo of typical 700R4 - 4L60 series servos. *On left is Corvette size servo. Go to the OEM or various aftermarket parts sources for this servo. *In middle is a rare servo size from SSR truck and TrailBlazer SS, not a common size to find. Numbers on inside of the bottom section will end with 159. *On the right is common V8 sized servo, also used in 4.3 L V6 applications. Numbers on inside of the bottom section will end with 553. [[file:700r4_servos.jpg]] Not pictured is the 4L70E servo - which looks similar to the Corvette servo but with a slightly smaller diameter.
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