Good afternoon (at least where I am),

I was wondering if anybody can at least point in the right direction. I'm trying to change a certain part of text within a cell value depending on whether another part of text within that same cell meets a certain criteria.

For example:

If cells A1 through A5 looked like this:

ds84
ds80
ds75
ds14
ds27

I would like to have the VBA code loop through and look at the last two numbers, and if they are less than 60, for example, then it will change the "ds" into "dt".

Thus, the result would look like:

ds84
ds80
ds75
dt14
dt27

Thank you for your time.