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USD 99.95
Part #: XD343

XDP Xtra Cool Transmission Cooler Thermal Bypass Valve Upgrade XD343

Vehicle Fitment:
2013-2018 Ram 6.7L Diesel (68RFE & AS69RC Transmission) | See full application list below
Part #: XD343
★★★★★ ★★★★★ 6 Reviews
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Replace the problematic factory thermal bypass valve in your 2013-2018 Dodge Ram 6.7L Diesel before it causes catastrophic failure with the XDP Xtra Cool Transmission Cooler Thermal Bypass Valve Upgrade XD343. The OE thermal bypass valve is designed to route bypass the transmission cooler in cold temperatures in order to bring the transmission up to operating temperature faster. Unfortunately, the bimetallic valve commonly fails in the closed position, causing hot transmission fluid to constantly circulate right back into the transmission, never, or barely, passing through the cooler at all. This results in excessive transmission temperatures, potentially damaging your transmission and leaving you stranded on the side of the road with not only an expensive tow bill, but a costly repair bill as well!

XDP's Thermal Bypass Valve Upgrade utilizes an unrestricted straight through design, eliminating the recirculation aspect of the factory TBV. No more having to worry about when the factory part will fail you. By removing the passageway that returns hot fluid back to the transmission, fluid restriction is reduced, lowering overall transmission temperatures. A transmission that runs cool will last longer than one that's always hot. Installation is just like installing the OE part, requiring no cutting or modifications to the factory lines. To prevent leaks before they start, Four (4) new O-rings are supplied as well as two (2) quick connect fittings, making for a complete bolt-on kit for the 68RFE and Aisin AS69RC transmissions.

  • Direct Replacement
  • Eliminates Hot Fluid Recirculation
  • Cooler Transmission Temperatures
  • No Modification Needed For Installation
  • Replaces Factory Thermal Bypass Valve
  • Fits 68RFE & Aisin AS69RC Transmissions
  • Replaces OE Part #: 68186711AA & 68186711AB
Note: Will also fit Hemi trucks equipped with a 545RFE, 65RFE, or 66RFE transmission.

Vehicle Fitment

2013 Ram 2500 6.7
2014 Ram 2500 6.7
2015 Ram 2500 6.7
2016 Ram 2500 6.7
2017 Ram 2500 6.7
2018 Ram 2500 6.7
2013 Ram 3500 6.7
2014 Ram 3500 6.7
2015 Ram 3500 6.7
2016 Ram 3500 6.7
2017 Ram 3500 6.7
2018 Ram 3500 6.7


  • MPN XD343
  • SKU XD343
  • GTIN 856217008793
  • ID 50183
  • Manufacturer Name XDP
  • Shipping Weight 1.00 lb.
  • Shipping Length 7 in.
  • Shipping Width 5 in.
  • Shipping Height 3 in.
  • Fuel Type Diesel / Gas
  • Warranty Info 1 Year / Unlimited Mileage
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Cross Reference # 68186711AA, 68186711AB
  • Internal L59R35


★★★★★ ★★★★★
3.5/5 Stars out of 6 Reviews
Verified Buyer
Installed before a long road trip. The block worked fine for the first 1k mi but then coming back from the trip it started leaking out the quick connect fittings in middle of nowhere Kansas, took some multi-duty rubber hose and eliminated block completely to get me back home. Going to try and put bigger o rings in and see if that takes care of the leaking issue. Other than that happy with ther performace of the block.
Verified Buyer
Fairly good quality, however, like many others mine started leaking out of the quick connects, going to pull apart and put in new o-rings this weekend, not super excited but it's not a big deal.
Verified Buyer
Ram 2500
Just finished a 450 mile trip after the install. Before I would see 172-185 temps from the transmission temp gauge. On this trip the temp hung out around 162-168. Not the dramatic drop I was expecting. The ambient outside temperature never exceeded 83 degrees so not a hot day at all.
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