Need help Identifying my model year!

[GregLloyd1]

Hey Y’all I need some help please.
I bought a 1979 GMC K1500 High Sierra SCSB stepside (according to my title). The front end appears to have a 84’ conversion done to it. It’s basically frankstein with miss matching year interior parts just rigged/screwed together.

Now frame down I’ve identified as 79-80 model year components and the VIN on my dash frame matches my title. The cab doors have a VIN belonging to an 84 GMC High Sierra (imagine it was a full front end donor conversion).

I just need help ensuring the cab is a 79 model before i start buying parts. Please let me know if any sure ways to tell or identify.


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[GregLloyd1]

Here’s a photo of the truck when i bought it.
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[VileZambonie]

Depends on what parts you are buying. Post pics of the inside, dash, etc. Are the wipers on the dash or on the stalk? Lot's of parts will interchange and can be made to enhance your truck although most have been butchered

[GregLloyd1]

Interior when i bought it


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[VileZambonie]

So, looks like an 84 cab on a 79 chassis like you originally said.

[GregLloyd1]

Interior doesn’t fit correctly though. Is there a way to know based off the dash frame shell?


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[GregLloyd1]

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[GregLloyd1]

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[GregLloyd1]

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[GregLloyd1]

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[GregLloyd1]

The VIN on that dash frame is to a 79’ so i imagine the cab was just retrofitted with the dash components?


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[Irish_Alley]

in 79 the wiper switch would be in the dash and the high beam switch would be on the floor. i doubt someone rewired the cab and hid the front clip conversion so good you dont see any patch work on the firewall. that being said the vin plate "might" not be the correct vin plate for that truck. i wouldnt really advertise this as you never really know whos watching......i also had a friend in high school that lost a truck because the vin had been swapped and someone extorted him into selling the truck or they would tell the state police because too many people knew

[GregLloyd1]

Ok idk i guess,
The high beam is on the stalk along with wiper control.


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[GregLloyd1]

Here’s the fuse box area



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[GregLloyd1]

Here’s the fender wells to the firewall, are those gaps normal?



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