⚙️THM 400 Transmission Reverse Issues: Tales from the Bench скачать в хорошем качестве

⚙️THM 400 Transmission Reverse Issues: Tales from the Bench

*THM 400 & C6 Transmission Analysis* *Subject:* Review of Transmission Issues, Upgrades, and Failures – THM 400 & Ford C6 *Source:* "THM 400 Transmission Reverse Issues | Tales from the Bench" Video Excerpts This video excerpt focuses on the repair and upgrading of two automatic transmissions: a *Turbo Hydramatic (THM) 400* and a Ford C6. The THM 400 is from a high-performance Jeep used for sand dune jumping, while the C6 exemplifies common failure points. *THM 400 Transmission: Key Issues and Upgrades* **Vehicle Application**: The THM 400 is installed in a Jeep (likely a Commander or Gladiator) with a Cummins diesel engine. It is used for sand dune jumping, requiring robust components. *Original Problem:* The THM 400 experienced a reverse issue due to a *broken pressure plate* on the direct drum caused by the extreme stress of repeated airborne landings. *Upgrade Strategy:* The mechanic is upgrading the THM 400 for durability and performance: *Friction Plates:* Using 4L80 high-energy frictions in the intermediate clutch. Increasing the direct drum from 5 clutches to 7, and using 6 clutches in the forward drum. Red Eagle thin, high-performance frictions are also being used. *Sprag:* Upgrading the roller-type one-way clutch to a sprag-type with a 36-element sprag for heavy-duty use. *Manual Valve Body:* A Transgo manual kit disables the automatic governor and modulator, allowing for manual shifting. *Adapter:* An adapter for a transfer case (51-6400) is present. *Torque Converter:* Using an Allison-type low stall torque converter suited for the diesel engine. *4L80 Similarity:* The mechanic notes the 4L80 is essentially a THM 400 with an overdrive section. *Ford C6 Transmission: Failure Analysis* *Overview:* The C6 is presented as an example of failure due to poor rebuild practices. *Identified Problems:* *Broken Pump Washer:* This caused the gear train to slap back and forth. *Used Steels:* Old, worn steels were used with new frictions, leading to premature wear. *Sun Shell Wear:* The sun shell is worn, wobbling due to issues in the gear train. *Corrective Actions:* The mechanic advises replacing steels when rebuilding a unit. The sun shell could be upgraded with a front planet from an E4OD for a deeper first gear. *Additional Observations* *Vehicle Showcase:* The modified Jeep has large tires, a roll cage, and other performance features, showcasing its intended use. *"Archaeology Week":* The mechanic humorously calls it "archaeology week" working on both older model transmissions. *Key Takeaways* Specific upgrades are necessary for high-stress applications. Friction compatibility and proper steels must be matched for longevity. Identifying and addressing the root cause of failures is vital. Using worn components, even with new frictions, leads to failure. Manual shifting can be preferred for specific applications. THM400, C6, Transmission, Jeep, Cummins, Diesel, Sand Dunes, Upgrades, Repair, Failure, Manual, 4L80, Sprag, Friction, Steels, Torque Converter, Pressure Plate, #THM400 , #C6 , #TransmissionRepair , #JeepBuilds , #CumminsPower , #OffRoad , #SandDunes , #AutoMechanic ,