4l80e overrun clutch. GM 4L80E Overrun Clutch Piston Molded Rubber 4L80-E 4L85E 4L8...

4l80e overrun clutch. GM 4L80E Overrun Clutch Piston Molded Rubber 4L80-E 4L85E 4L85-E Automatic Transmission 91-On OPT Product Code: NTP-33846 Jun 22, 2023 · Insufficient holding power in the overdrive roller clutch is the underlying cause of chronic OD roller clutch failure in hardworking 4L80-E and 4L85-E transmissions. . 080" GEN 2, Blue Friction Clutch Plate 1991-ON replaces 8661571 for Serious racing applications. GM 4L80E Performance Transmission Upgrades Originally found in 3/4- and 1-ton trucks, the 4L80E and higher-torque 4L85E transmissions share gear ratios with the 3-speed TH400, but add the 4th Gear Overdrive which is popular for high-horsepower street cars. 4 days ago · Easily upgrade your existing earlier style roller clutch assembly to this newer heavy duty version. This is a new made in the USA overrun clutch steel plate for GM's 4L80E automatic transmissions manufactured from 1991 and up. Buy this high quality 4L80E overrun clutch molded rubber piston online from GMTransmissionParts. It holds air indefinitely and so does the overrun but when checking the foward clutch I can barely hear a slight amount of air escaping. Feb 4, 2022 · Appears it applies the overrun clutches in all ranges with the shifter in the OD range to help save the OD roller clutch. com. Nov 20, 2025 · Sonnax 34200-40K. 0. R577690 GM 4L80E Overrun . Get hundreds of free tech resources online 24/7. Best way to check? I'm a bit lost on how to troubleshoot this. Everything looks good, but overrun clutch, metals, and pressure plate are burnt and dished. I mean I really have to listen for it holding my ear down close. 539'' ID 3 Used in typical 4L80E Rebuild OEM Part Number: 8661569 Aug 15, 2017 · Build in unrivaled 4L80-E, 4L85-E durability with the Sonnax Smart-Tech ® overrun clutch valve kit 34200-40K. If the driver selects the overdrive range when they are plowing in a 4L80-E truck, the overrun clutch can’t come on to provide better holding power. No other pieces necessary. clutch inner race & roller clutch outer cam housing. Aug 13, 2018 · Trans is currently disassembled and mostly rebuild. Refer to the application chart (Figure 5) and note that, in the Overdrive range on the 4L80-E, the OD roller clutch is holding by itself and the overrun clutch is only on in the manual ranges, D, 2 and 1. The patented Sonnax Smart-Tech overrun clutch valve kit i mproves OD roller clutch holding power in D4 and Reverse ranges to guard against failure and catastrophic transmission damage. Works in GM transmission model years 2001-UP. Is this necessary in anything that isn't a snow plow? Mar 2, 2017 · With unique rerouting of hydraulic fluid pressure, this patented kit keeps the overrun clutch applied at all times (except OD 4th), reinforcing the roller clutch to adequately support heavy loads. Jun 22, 2017 · This patent-pending kit delivers exceptional protection against failure by applying the overrun clutch in all ranges other than 4th Gear, allowing the clutch to share a load the OD roller clutch otherwise struggles with on its own. 099 / 2. So, my guess is overrun clutch/piston is being applied in OD? Reverse felt normal. 51'' Thick 4. Overrun sprang has burnt plastic but still looks functional. Insufficient holding power in the overdrive roller clutch is the underlying cause of chronic overdrive roller clutch failure in hardworking 4L80-E and 4L85-E transmissions. It takes almost a full minute for the air to Bleed off once I stop putting Mar 2, 2017 · The reason for this 4L80-E failure may come from a number of different avenues. Works with your existing roller. 4L80E overrun clutch piston kit contains (snap ring, spring retainer assembly, molded rubber piston). Smart-Tech® Overrun Clutch Valve Kit. Overrun Clutch with. As this video demonstrates, the simple components install easily onto the valve body — no transmission removal required — for improved performance and maximum protection against overdrive roller clutch failure. Overrun Clutch. With unique rerouting of hydraulic fluid pressure, this patented kit keeps the overrun clutch applied at all times (except OD 4th), reinforcing the roller clutch to adequately support heavy loads. Find many great new & used options and get the best deals for 1991-2000 Chevy GMC MT1 OEM GM 4L80E Overrun Clutch Drum w/Sun Gear at the best online prices at eBay! Free shipping for many products! Sonnax offers cutting-edge transmission, torque converter and driveline products for the automotive aftermarket. Feb 1, 2017 · Herein lies a big difference between the 4L80-E and the 4R100 and a possible reason that the 4L80-E roller clutch fails more often than the 4R100. Please contact us if you have any questions! Aug 14, 2025 · clutches work great and it hols 30 psi air pressure nicely. kdr ehx drn vbc bph sfq cfq onm xop vif feh pwd jrv psw ixt