« Reply #1 on: August 17, 2012, 02:18:16 pm »
Should have a point in the back for bracing it. Your factory radio had a brace in the back as well. If you don't have it you should be able to make one to replace it. I was able to get my new Pioneer Single DIN to mount to the stock rear support without any modifications.

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-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6