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When working properly, the 68RFE and Aisin AS69RC are a great transmission. Unfortunately, though, when things go bad, they go very bad. The 68RFE especially has been plagued with a high failure rate that many attribute to the fact the converter in this transmission never goes into a full lockup, which creates excessive heat, and we all know what heat does to a transmission. Interestingly enough, this easy to install bypass valve delete can keep your transmission temperatures in check in certain environments, potentially saving you a heap of money.
Another part that can be damaged by the heat allowed to pass through the factory bypass valve is the factory plastic filter coupler. To remedy this, ATS manufactures and includes a billet filter coupler so that the filter has a solid mounting point which won't be compromised by higher temperatores or over-tightening.
HOW IT WORKS: Ram decided to incorporate a transmission cooler bypass valve into the cooling system of the 68RFE and Aisin AS69RC that bypasses the transmission cooler during cold operation. The intent is to force the transmission to warm up faster. The reality is this bypass valve leaks and sticks in the bypass position in almost every case, causing the transmission cooler flow to bypass the trans cooler, essentially eliminating the trans cooler from the circuit. This causes severe damage to the transmission over time because it is not being adequately cooled by the transmission cooler. The ATS cooler block replaces the faulty design, eliminating the bypass valve and ensures 100% of the trans cooler flow is forced through the trans cooler. In every case this substantially reduces transmission temperatures.IMPORTANT FITMENT NOTES:
- This product will only work on 68RFE and Aisin AS69RC transmissions. The AS69RC is found on cab and chassis models, which is different than the ASC69RC, found on the later model High Output Rams. If you are uncertain as to which transmission you have, please reference your build sheet.
- Replaces part numbers 68186711AA, 68186711AB
- ManufacturerATS Diesel Performance
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ATS 3100052392 Thermal Bypass Valve Delete 13-18 Ram 6.7L Cummins