Turns out to be the VSS(speed sensor)module. As a new one came with the tranny it is likely to be the wiring.
why is my 1991 Mazda truck surging at higher speeds
nevada...on highway 50.
The EPA range estimate for the 2008 Mazda MAZDA5 is 349.8 mi. in the city, 445.2 mi. on the highway.
The EPA range estimate for the 2014 Mazda MAZDA5 is 333.9 mi. in the city, 445.2 mi. on the highway.
The EPA range estimate for the 2006 Mazda MAZDA5 is 302.1 mi. in the city, 397.5 mi. on the highway.
The EPA range estimate for the 2011 Mazda MAZDA2 is 327.7 mi. in the city, 395.5 mi. on the highway.
The EPA range estimate for the 2012 Mazda Mazdaspeed3 is 286.2 mi. in the city, 397.5 mi. on the highway.
The EPA range estimate for the 2013 Mazda MAZDA6 is 388.5 mi. in the city, 555.0 mi. on the highway.
The EPA range estimate for the 2007 Mazda MAZDA6 is 378.0 mi. in the city, 522.0 mi. on the highway.
The EPA range estimate for the 2015 Mazda MAZDA6 is 410.0 mi. in the city, 606.8 mi. on the highway.
The EPA range estimate for the 2005 Mazda MAZDA3 is 348.0 mi. in the city, 464.0 mi. on the highway.
The EPA range estimate for the 2014 Mazda MAZDA6 is 410.0 mi. in the city, 606.8 mi. on the highway.
The EPA range estimate for the 2008 Mazda MAZDA6 is 378.0 mi. in the city, 522.0 mi. on the highway.
The EPA range estimate for the 2012 Mazda MAZDA6 is 388.5 mi. in the city, 555.0 mi. on the highway.
The EPA range estimate for the 2012 Mazda MAZDA2 is 327.7 mi. in the city, 395.5 mi. on the highway.
The EPA range estimate for the 2004 Mazda MAZDA6 is 378 mi. in the city, 522 mi. on the highway.
The EPA range estimate for the 2009 Mazda MAZDA6 is 370.0 mi. in the city, 536.5 mi. on the highway.
The EPA range estimate for the 2006 Mazda MAZDA3 is 348.0 mi. in the city, 464.0 mi. on the highway.
The EPA range estimate for the 2012 Mazda MAZDA3 is 362.5 mi. in the city, 478.5 mi. on the highway.
The EPA range estimate for the 2013 Mazda Mazdaspeed3 is 286.2 mi. in the city, 397.5 mi. on the highway.
The EPA range estimate for the 2010 Mazda MAZDA5 is 349.8 mi. in the city, 445.2 mi. on the highway.
The EPA range estimate for the 2013 Mazda MAZDA5 is 333.9 mi. in the city, 445.2 mi. on the highway.
The EPA range estimate for the 2011 Mazda Mazdaspeed3 is 286.2 mi. in the city, 397.5 mi. on the highway.
The EPA range estimate for the 2010 Mazda Mazdaspeed3 is 286.2 mi. in the city, 397.5 mi. on the highway.
The EPA range estimate for the 2011 Mazda MAZDA3 is 362.5 mi. in the city, 478.5 mi. on the highway.