66RFE Sun Shell 2007, remanufactured and ready to install. Fits the 66RFE. Ships fast from the USA.
The catalog name on this page says sun shell, but the part in the photo is a genuine Mopar 4WD extension housing, cast number 52119637AA, for the 66RFE and 68RFE automatics in Ram heavy-duty trucks. Mopar catalogs the same number as a transfer case adapter, and that name explains the job: it is the aluminum housing that bolts to the back of the transmission case and carries the transfer case. Owners usually go looking for one after a cracked mounting ear, a housing damaged when a transfer case was pulled, stripped bolt holes, or a weep of red fluid at the joint between the transmission and the transfer case that will not stop. This housing has been cleaned and visually inspected and ships as pictured.
On a 2WD truck the back of the transmission ends in a long tail housing and a yoke seal. On a 4WD Ram the output shaft instead feeds straight into the transfer case, so the rear housing is short and flanged. The housing in the photo has a bearing pressed into its center bore, which supports the output shaft where it leaves the gearbox. The transfer case hangs from studs on the rear face, so this casting carries the weight and torque reaction of the whole transfer case as well as sealing transmission fluid in. Any crack, warped flange or worn bearing bore here shows up as leaks, noise or misalignment between the two units.
Clean the whole rear of the transmission, drive a few miles and look for where fluid first appears. Our 68RFE fluid leak guide shows the usual leak points so you do not replace a housing for a pan gasket or cooler line leak. Check the transfer case fluid color too. If the noise is the complaint, rule out driveshaft U-joints and the transfer case itself before blaming the housing bearing.
This housing is listed for 4WD trucks with the 66RFE or 68RFE. The 68RFE went in behind the 6.7L Cummins in Ram 2500 and 3500 pickups starting in the 2007 model year, and the 66RFE is the gas heavy-duty six-speed behind the 5.7L and 6.4L Hemi. It is not for 2WD transmissions, which use a different tail housing. Housing designs and transfer case mounting can vary, so read the cast number on your old housing and compare the bolt pattern and boss layout with the photo before ordering. If you are unsure which unit you have, the 66RFE identification guide and the 66RFE vs 68RFE comparison will help, or send us your year and VIN. More parts are on the 68RFE parts page and the 66RFE parts page.
| Fits | 66RFE 2007 |
| Part type | Sun Shell |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The catalog name is wrong. This is an OEM Mopar 4WD extension housing for 66RFE and 68RFE transmissions, cast number 52119637AA.
No. It is a 4WD housing that mates to the transfer case. 2WD transmissions use a longer tail housing with a yoke seal.
It is listed for both. Match the 52119637AA number on your old housing and compare the bolt pattern and bosses with the photo, or send us your VIN.
Yes. The transfer case bolts to the rear face of this housing, so it has to come off first.
ATF+4 in the transmission, checked hot at 160 degrees F or higher. The transfer case has its own fluid, so check that level separately.
