If you are concern then check cooler to made sure they isn't clogged.
Change fluid and filter would give you peace mind.
170oF that is nothing compare to 260oF I drove for 300 miles in F350 that got 9 mpg due torque convertor blew up. It had 219,000 when it blew up. Fluid were extremely brown and very stunk that tran shop open their bay door to vent.
Before tran blew up. It was running little hotter. Like outside 40oF It would read 160-180 that were easier drive plus tons of coast. Keep rpm down 2K.
Rebuilt tran with lower stall triple billet torque convertor. 1K load and drive manic it 150oF in 60oF. with new cooler mount on front of ac condsor near hood. Factory cooler are sit on bottom of bumper there no air flow though that. Stupid design.