Could be this:LOW TRANS FLUID LEVEL &/OR SHIFT/ENGAGEMENT CONCERNS
TECHNICAL SERVICE BULLETIN
Reference Number(s): 97-12-13, Date of Issue: June 9, 1997
Superceded Bulletin(s): 96-20-18, Date of Issue: September 23, 1996
Related Ref Number(s): 96-20-18, 97-12-13
TRANSMISSION - C6, E4OD, AOD, 4R70W - LOW TRANSMISSION FLUID LEVEL AND/OR
SHIFT AND/OR ENGAGEMENT CONCERNS - 4X4 AND AWD VEHICLES ONLY
The transmission may have low fluid level and/or may have either a shift concern and/or an
engagement concern. This may be caused by transmission fluid leaking from the transmission into
the transfer case through the transfer case input seal.
Replace the transfer case input seal. The new seal should reduce the possibility of fluid leaking from
the transmission into the transfer case. Refer to the following SERVICE PROCEDURE for details.
1. Check the transmission fluid level. If the transmission fluid level is low and there are no visible
signs of a leak, check the transfer case fluid level. The level of fluid in the transfer case should
be just below the fill plug hole.
2. If the transfer case fluid level is overfull and the transmission fluid is not burnt, remove the
transfer case from the vehicle following the procedure outlined in the appropriate model/year
3. Remove the transfer case input seal. Clean the seal bore in the transfer case.
4. Install a new Transfer Case Input Seal (F77Z-7B215-AA).
5. If the transmission fluid is burnt, repair the transmission as required and then replace the
transfer case seal as outlined in Step 3.
1987-96 Bronco; 1987-97 F-150, F-250, F-350; 1996-97 Explorer; 1997
This bulletin supersedes Technical Service Bulletin 96-20-18 dated
September 23, 1996.
Transfer Case Input Seal
Sunday, January 9th, 2011 AT 4:17 PM