'05-'06 Head Gasket issue

I've read a lot about the problem with the head gasket in these year models. Can anyone tell me when in '06 Toyota started building the 4.0 engines with the new head gaskets? I've seen reference to early '06 but no specific date. My '06 shows a manufacture date of 03/06 so this issue is on my mind. The truck runs great and currently has 134000 miles on it with no signs of head gasket failure. I'm the original owner. Thanks

 

Switch over was November 2006.

 

'05/'06 Tacoma Head Gasket Failure Poll

 

November of ‘05.

 

Exactly.

November 2006 is a 2007 model.

 

DOH! And I looked right at the damn thread too to make sure I had the month right. Sorry OP, I was careless with my typing.

 

275000 on my 06. Build date 03/06. No issues yet

 

28OCT 2005 hopefully mines the changed version.

 

My 06 was built on 12/05. :whew:

 

05/05. 158K. I don't want to jinx myself, but I think mine are starting to go. Truck is perfect except for stupid head gaskets.
All the repair estimates I've received, reputable independent shops and Toyota dealers, have been over $4200. Sucks.

 

OK, thanks everyone. I feel much better now about my trusty Tacoma.