98+ steering wheels are a direct bolt on for 95-97 GMT400s. You will have to swap the clockspring as the airbag plug is different between the years.
Here is a How-To install steering wheel audio controls in a GMT400 and GMT800.
http://www.gmt400.com/forum/showthr...-02-NBS-Steering-Wheel-Audio-Control-Install/
Ex's 95 Silverado K1500. Swapped to a 98+ wheel & bag with controls from a S-series. Before & After
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My 99 Silverado K2500. Had a no airbag, installed 98+ wheel, airbag and clockspring (airbag was not connected) so I could have audio controls.
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Just for good measure, my OEM wheel (yes, the yellow is a legit GM item) in my 02 GMT800 with audio controls added.
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