Author Topic: Using 87 C20 frame for a 87 V20  (Read 11454 times)

Offline dc7432

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Using 87 C20 frame for a 87 V20
« on: September 08, 2025, 09:28:22 pm »
Our 87 V20 (4wd) frame needs to be replaced and we found a 87 C20 (2wd) frame. Looking for advice on what modifications the C20 will need to convert to 4wd. Our plan is to use everything on the V20 just need a frame, thanks in advance.

Offline Captkaos

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Re: Using 87 C20 frame for a 87 V20
« Reply #1 on: September 10, 2025, 09:28:41 am »
Generally speaking every component for the engine mounting and trans mounting will need to be transfered.
The front and rear suspension mounting will also need to be transfered over.

Basically, in short without granular detail, you are going to strip both frames down to the frame rails and transfer them over being mindful of location

Offline JohnnyPopper

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Re: Using 87 C20 frame for a 87 V20
« Reply #2 on: September 15, 2025, 02:30:24 pm »
Take lots of photos before starting  ::) :'( ;)
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 VileZambonie

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Re: Using 87 C20 frame for a 87 V20
« Reply #3 on: September 17, 2025, 06:05:36 pm »
Do you mean R20?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline JohnnyPopper

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Re: Using 87 C20 frame for a 87 V20
« Reply #4 on: September 17, 2025, 06:27:44 pm »
VZ pretty sure he does  ;D

Curious why you need a complete frame?
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 dc7432

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Re: Using 87 C20 frame for a 87 V20
« Reply #5 on: November 07, 2025, 10:26:09 am »
It’s a V20 change to V in 87. The frame is complete rusted and falling a part.

Offline bd

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Re: Using 87 C20 frame for a 87 V20
« Reply #6 on: November 07, 2025, 11:39:20 am »
Do you mean R20?

It’s a V20 change to V in 87. The frame is complete rusted and falling a part.

VileZambonie's post simply refers to the thread title, "Using 87 C20 frame for a 87 V20."

GM rebranded the 1987 model year light-duty trucks from "C" to "R" and "K" to "V" for marketing reasons.  Most people rolled their eyes when GM did that.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Shifty

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Re: Using 87 C20 frame for a 87 V20
« Reply #7 on: November 07, 2025, 02:47:32 pm »
It was tough to be an auto parts counterman after that mistake.... :o
87 V20 Standard Cab Longbed (current)

87 R30 3+3 Longbed (days of yore)

98 C2500 ext cab longbed

Offline bd

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Re: Using 87 C20 frame for a 87 V20
« Reply #8 on: November 07, 2025, 03:25:35 pm »
It's funny how after 36 years the confusion has only slightly waned.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline JohnnyPopper

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Re: Using 87 C20 frame for a 87 V20
« Reply #9 on: November 08, 2025, 03:01:13 pm »
I get what the R stood for.

What was the V supposed mean, along with what marketing target?
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 bd

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Re: Using 87 C20 frame for a 87 V20
« Reply #10 on: November 08, 2025, 04:46:46 pm »
I think both chassis codes were arbitrary, outside of not conflicting with other GM car line chassis codes.

The marketing challenge was to retain the C/K designations for the new body styles during the overlapping years that both body styles were produced and sold (1987 - 1991).
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)