the steering shaft is the same on the 79 & 85 , but remember that in 84 they went to stalk mounted controls for the wipers & hi beams. you will have to have a fair understanding of wiring to do this . I did it once a while back and left the controls on the dash for wipers and used the stalk mounted hi-beam switch. I had wiring diagrams avaailable back then but it can't be too tough to figure out from scratch. DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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