rattling, squeaking as automatic gears shift on 2004 Hyundai Santa Fe

It seams to happen most as 1st gear shifts into 2nd (20mph-25mph) and then again as it shifts into 3rd (35mph-40mph)

1 answer
For the record - 20-25 mph is way too late for a 1-2 shift. You are probably feeling a 2-3 shift from 20-25 and from 35-40 a 3-4 shift...or you may be feeling the torque converter engage.

In any case, with the noise - it's pretty impossible to do anything from the Internet on this one -- you'll need to have a good tech hear the noise first hand and give you advice.

https://repairpal.com/directory?address=37312&car_brand_names=Hyundai

Click that link for some shops near you!