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Gid'ay Ben, welcome.
That sounds like the torque converter unlocking. It will lock the converter when the load is off and the car is cruising. If you accelerate or start climbing a hill, the converter will unlock to multiply torque. When the load is over, then it will lock up again.
The revs will change by about 275/300 rpm.
Harvey. 
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One Arm Bloke.
Tell it like it is!
95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
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