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It is located on the rear of the transmission. Should be round and have a vacuum hose attached to the middle of it.
i would check the vacuum hose that goes to the vacuum modulator on the transmission the vacuum modulator probably has a hole in it and the fluid is going into the engine and being burned or check your coolant the radiator may have a hole in the transmission cooler inside the radiator so check your coolant and the vacuum hose for trans fluid good luck
it should be on the side of the transmission with a black rubber tube from the engine leading to it
the 4t60-e transmission uses a shift modulator that can be found at most auto part stores. however i believe the '99 regals use the 4t65-e transmission which are not vacuum operated therefor to up the shift pressure you will need a tuner or a shift kit.
You can take transmission out of a 2005 Buick and put it in your 1995 Buick regal.
The 2014 Buick Regal has a 6-speed automatic.
The 2004 Buick Regal has a 4-speed automatic.
The 2002 Buick Regal has a 4-speed automatic.
The 2001 Buick Regal has a 4-speed automatic.
The 2003 Buick Regal has a 4-speed automatic.
The 2013 Buick Regal has a 6-speed shiftable automatic.
The 2011 Buick Regal has a 6-speed shiftable automatic.