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SKU:72978-01K
Suncoast 4C Retaining Ring & Shim Kit
Suncoast 4C Retaining Ring & Shim Kit
Description
The 4C return spring retaining ring in Chrysler 45RFE, 545RFE, 65RFE, 66RFE and 68RFE transmissions is known to come unseated and pop off, resulting in transmission failure. To repair and prevent this problem, plus more easily tune 4C performance, Sonnax offers 4C retaining ring and shim kit 72978-01K with three essential parts for a reliable build.
The custom G-Loc ring in the Sonnax kit mechanically holds the OE retaining ring in place to prevent it from popping out.
The kit’s .078" thick clutch backing plate retaining ring makes it easier to achieve the 4C clearance specification of .030 to .055". Setting this clearance is difficult when OE selective backing plate retaining rings are not readily available. As a result, some builders use thinner steel plates, but this undermines the clutch pack’s ability to dissipate heat. The ring in the Sonnax kit is .010 " thinner than the ring most units have from the factory, allowing for more choices when setting clutch clearance.
The spring pack shim in the kit gives the option slightly tune the 4C clutch to release more quickly. Combining the shim with the thinner backing plate retaining ring and setting clearance closer to the high end of spec will preload the return spring for increased force. The result is improved 4C to OD shift timing when more aggressive, quicker-applying OD clutch packs are used.
- Prevents 4C return spring retaining ring from popping off
- More options when setting clutch clearance
- Improves 4C to OD shift timing
Fitments
2021 Dodge Ram 2500
2021 Dodge Ram 3500
2020 Dodge Ram 2500
2020 Dodge Ram 3500
2019 Dodge Ram 2500
2019 Dodge Ram 3500
2018 Dodge Ram 2500
2018 Dodge Ram 3500
2017 Dodge Ram 2500
2017 Dodge Ram 3500
2016 Dodge Ram 2500
2016 Dodge Ram 3500
2015 Dodge Ram 2500
2015 Dodge Ram 3500
2014 Dodge Ram 2500
2014 Dodge Ram 3500
2013 Dodge Ram 2500
2013 Dodge Ram 3500
2012 Dodge Ram 2500
2012 Dodge Ram 3500
2011 Dodge Ram 2500
2011 Dodge Ram 3500
2010 Dodge Ram 2500
2010 Dodge Ram 3500
2009 Dodge Ram 2500
2009 Dodge Ram 3500
2008 Dodge Ram 2500
2008 Dodge Ram 3500
2007 Dodge Ram 2500
2007 Dodge Ram 3500
2013 Dodge Durango
2013 Jeep Grand Cherokee
2012 Dodge Durango
2012 Dodge Ram 1500
2012 Jeep Grand Cherokee
2012 Jeep Liberty
2011 Dodge Dakota
2011 Dodge Durango
2011 Dodge Ram 1500
2011 Jeep Grand Cherokee
2011 Jeep Liberty
2010 Chrysler 300
2010 Dodge Dakota
2010 Dodge Durango
2010 Dodge Ram 1500
2010 Jeep Grand Cherokee
2010 Jeep Liberty
2009 Chrysler 300
2009 Dodge Dakota
2009 Dodge Durango
2009 Dodge Ram 1500
2009 Jeep Grand Cherokee
2009 Jeep Liberty
2008 Chrysler 300
2008 Dodge Dakota
2008 Dodge Durango
2008 Dodge Ram 1500
2008 Jeep Grand Cherokee
2008 Jeep Liberty
2007 Chrysler 300
2007 Dodge Dakota
2007 Dodge Durango
2007 Dodge Ram 1500
2007 Jeep Grand Cherokee
2007 Jeep Liberty
2006 Chrysler 300
2006 Dodge Dakota
2006 Dodge Durango
2006 Dodge Ram 1500
2006 Dodge Ram 2500
2006 Dodge Ram 3500
2006 Jeep Grand Cherokee
2006 Jeep Liberty
2005 Chrysler 300
2005 Dodge Dakota
2005 Dodge Durango
2005 Dodge Ram 1500
2005 Dodge Ram 2500
2005 Dodge Ram 3500
2005 Jeep Grand Cherokee
2005 Jeep Liberty
2004 Dodge Dakota
2004 Dodge Durango
2004 Dodge Ram 1500
2004 Dodge Ram 2500
2004 Dodge Ram 3500
2004 Jeep Grand Cherokee
2004 Jeep Liberty
2003 Dodge Dakota
2003 Dodge Durango
2003 Dodge Ram 1500
2003 Dodge Ram 2500
2003 Dodge Ram 3500
2003 Jeep Grand Cherokee
2003 Jeep Liberty
2002 Dodge Dakota
2002 Dodge Durango
2002 Dodge Ram 1500
2002 Jeep Grand Cherokee
2002 Jeep Liberty
2001 Dodge Dakota
2001 Dodge Durango
2001 Jeep Grand Cherokee
2000 Dodge Dakota
2000 Dodge Durango
2000 Jeep Grand Cherokee
1999 Jeep Grand Cherokee
Instructions
Specifications
SKU: 72978-01K
GTIN: 840385622219
Manufacture Name: Suncoast Performance
Shipping Weight: 2 lb
Shipping Length: 4 in
Shipping Width: 4 in
Shipping Height: 4 in
EO Number:
Cross Reference #
Warranty
California Proposition 65 Warning
California Proposition 65 Warning - P65warnings.ca.gov
72978-01K
Suncoast 4C Retaining Ring & Shim Kit
The 4C return spring retaining ring in Chrysler 45RFE, 545RFE, 65RFE, 66RFE and 68RFE transmissions is known to come unseated and pop off, resulting in transmission failure. To repair and prevent this problem, plus more easily tune 4C performance, Sonnax offers 4C retaining ring and shim kit 72978-01K with three essential parts for a reliable build.
The custom G-Loc ring in the Sonnax kit mechanically holds the OE retaining ring in place to prevent it from popping out.
The kit’s .078" thick clutch backing plate retaining ring makes it easier to achieve the 4C clearance specification of .030 to .055". Setting this clearance is difficult when OE selective backing plate retaining rings are not readily available. As a result, some builders use thinner steel plates, but this undermines the clutch pack’s ability to dissipate heat. The ring in the Sonnax kit is .010 " thinner than the ring most units have from the factory, allowing for more choices when setting clutch clearance.
The spring pack shim in the kit gives the option slightly tune the 4C clutch to release more quickly. Combining the shim with the thinner backing plate retaining ring and setting clearance closer to the high end of spec will preload the return spring for increased force. The result is improved 4C to OD shift timing when more aggressive, quicker-applying OD clutch packs are used.
- Prevents 4C return spring retaining ring from popping off
- More options when setting clutch clearance
- Improves 4C to OD shift timing
Suncoast 4C Retaining Ring & Shim Kit