Finally! GMT800 style towing mirrors on GMT400.

[AlwaysGM]

Very interested in these and for those who have them installed look great. My concern is with vibration. How bad do they shake? I have driven some GMT800's and the GM mirrors have little shake. How do these compare to OEM?

 

[ChrisAU]

If you install them properly they are fine. Mine shake some, but my ride is really rough too.

 

[97PROSHOZ71]

All of them are going to be a little more shakey than a stock GMT800-900 with the Vertical mirrors because the base that attaches to the truck is not near as large on ours as it is on the newer trucks. Smaller base means more vibration, and these trucks tend to have a little bit rougher ride. My top (large) glass is a bit shakey, as with everyone elses, but overall it is completely tolerable.

Oh ya, fully extended it's really about the same shaking, not bad.

 

[AlwaysGM]

Thanks for the replies, appreciate it!

 

[96k1500]

Mine mainly only shakes at an idle

 

[97PROSHOZ71]

Well you're special. LMAO

 

[96k1500]

I think its just that when i accelerate i dont notice it cause its not as bad

 

[88GMCtruck]

They vibrate. You can still see from them.

Mine actually vibrate the worse at idle, because of the lopey cam in the 454

 

[Darkrider]

They vibrate. You can still see from them.

Mine actually vibrate the worse at idle, because of the lopey cam in the 454

You spliced your marker lights into the factory clearance light harness didnt you? Also speaking of said harness where does it plug into the convenience center under the dash?

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[88GMCtruck]

I made a wiring diagram earlier in the thread, showing how to wire in diodes to use the light as a signal and marker light.

The cab light harness plugs in towards the top, although the plug changed throughout the years so you'll have to take a test light to figure out which cavity it is.