Author Topic: Extended cab squarebody trucks  (Read 3027 times)

Offline zieg85

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Extended cab squarebody trucks
« on: January 13, 2021, 11:20:53 AM »
A little history behind these trucks as I understand it.  Dodge and Ford offered extended cabs in the 70's while GM didn't offer it until the 1988 and newer body style.  CVI was one company that offered this conversion as well as extended crew cabs.  The base conversion was a $6K option and went up based on paint and interior options.  CVI out sourced the fancier versions with plush interiors and special paint beyond stock.  There were other companies that offered this conversion as well.  Other rear windows were smaller or opted for none.  These conversions was authorized by GM and came with the full factory warranty.  The conversions were done to long bed trucks by taking 18 inches out of the front of the bed.  The floor was reused as the extended cab floor, the bed pieces was moved to the cab and it was filled in.  Most common found were 1/2 ton 2 wheel drive top of the line Silverado but I've seen Scottsdale and even my Custom Deluxe bare bones truck.  Production numbers have not been verified as the CVI doesn't exist.  I'd love to see as many as possible here.  Pictured is my 1985 C30, a CVI conversion to a Custom Deluxe base model radio delete truck
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline 82scottsdalec10

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Re: Extended cab squarebody trucks
« Reply #1 on: June 06, 2021, 09:24:34 AM »
These were even offered on crew cabs as well. Ove ever only seen three pics of one.
Just another c10 loving guy

Offline mrghostwalker

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Re: Extended cab squarebody trucks
« Reply #2 on: June 07, 2021, 03:29:21 PM »
Nice truck!

Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #3 on: January 22, 2022, 06:54:02 PM »
Hello everyone, first post here but think it’s worth it because this form is what informed me more on hopefully my next purchase. 1985 Silverado 454 3 speed 1 ton dually EXTENDED CAB!!!! 70k on the odometer, now the work starts.


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Offline JohnnyPopper

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Re: Extended cab squarebody trucks
« Reply #4 on: January 22, 2022, 08:24:24 PM »
Go Matty! Show us your stuff and progress!





1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #5 on: January 22, 2022, 08:25:03 PM »



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Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #6 on: January 22, 2022, 08:26:39 PM »



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Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #7 on: January 22, 2022, 08:29:26 PM »
It won’t let me post all the pics so here’s a couple


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Offline zieg85

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Re: Extended cab squarebody trucks
« Reply #8 on: January 22, 2022, 09:50:35 PM »
nice, right below the door striker there is a silver sticker with the build number CVI had.  Please get a clear picture if you are able
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline JohnnyPopper

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Re: Extended cab squarebody trucks
« Reply #9 on: January 23, 2022, 02:20:43 PM »
She's a beauty! I have bucket seat envy now...

What did you have to part with to get her, if you don't mind me asking?

B.A.T. Auction had a 1978 K10 sell for 33K last week.

Speaking of bucket seats, does anyone have a set they would part with? The '80 has a bench that I would have to redo, but would love to switch out to buckets.
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #10 on: January 23, 2022, 03:03:48 PM »
So I haven’t traded yet due in part to my “better half” but trading a 2001 GMC Yukon that is super clean for what it is but it also has 240K. I also looked for the CVI plate which by reading previous post it should be on the passenger side but there wasn’t one. This was the only tag that didn’t look factory.

I know I’m talking to a partial group but good deal or no? It does have rust around the door frames from where they probably did the conversion but no fender or bed wheel wells rust.


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Offline zieg85

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Re: Extended cab squarebody trucks
« Reply #11 on: January 23, 2022, 04:48:59 PM »
So I haven’t traded yet due in part to my “better half” but trading a 2001 GMC Yukon that is super clean for what it is but it also has 240K. I also looked for the CVI plate which by reading previous post it should be on the passenger side but there wasn’t one. This was the only tag that didn’t look factory.

I know I’m talking to a partial group but good deal or no? It does have rust around the door frames from where they probably did the conversion but no fender or bed wheel wells rust.


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Going on book values the 2001 is worth more if in good shape.  Extended cab is extremely rare to begin with but made from a C30 dual rear wheels makes it very unique.  The yellow one is the only known SRW C30.  I have only seen a couple C30 DRW single cab conversions.  I really like it.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline Mattyp401

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Re: Extended cab squarebody trucks
« Reply #12 on: January 24, 2022, 08:32:01 PM »


Welp looks like I won this battle but she got herself a new today for the troubles lol but she’s home to joking her older sister. Already in love with it and the plans are building as we speak.


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Offline Mr Diesel

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Re: Extended cab squarebody trucks
« Reply #13 on: January 24, 2022, 08:37:04 PM »
That's a nice find. I have never seen an extended cab dually before.
1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465

Offline zieg85

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Re: Extended cab squarebody trucks
« Reply #14 on: January 25, 2022, 11:19:30 AM »


Welp looks like I won this battle but she got herself a new today for the troubles lol but she’s home to joking her older sister. Already in love with it and the plans are building as we speak.


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Enjoy, you have something special there
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/