no 1st gear reverse works fine, rev engine and 1st engages but bangs hard (5r44e)

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Curious what would cause the intermittent loss of 1st gear (reverse works fine) in a 5r44e
(2wd Mazda b-3000 ) when 1st does work, after revving lightly, it bangs hard and then 1st gear works fine....otherwise you have to take off in second..Could it be the 1st reverse servo at valve body...??? All Fluid has been flushed, new filter and she shifts fine thru all other gears including overdrive(no check engine light either) ....Any suggestions ??

 

sounds like your torque converter lockup servo is not dis-engaging

 

I have the same problem but my 1st gear engages only for a second when its supposed to shift into 2nd. Although it takes off in second gear.