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03-24-2013, 04:44 PM
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#1 |
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Registered User
Join Date: Sep 2010
Location: Kingston, PA
Posts: 394
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Frame questions
I am replacing the frame on my 3/4 ton 4x4 and can only find good 2wd frames. The one I want to get is off a c20 and has a little bit surface rust at the back. How different are the frames? I can change cross members if I have to and I j ow I will need the 4x4 rad support bracket for the perches.
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 87 GMC Sierra 2500 4x4 350/TH350/NP203 Flow Tech long tube headers, throttle body spacer, Edelbrock Performer cam, true dual Flowmaster 40s, 6 inch Superlift suspension lift 2000 silverado extended cab stepside 5.3l. Stock for now |
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03-24-2013, 04:55 PM
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#2 |
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Registered User
Join Date: Jan 2013
Location: Apple Valley, CA
Posts: 276
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Re: Frame questions
The rear cab mounts are diferent as well as the motor mounts cross member.
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03-24-2013, 05:00 PM
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#3 |
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Registered User
Join Date: Sep 2010
Location: Kingston, PA
Posts: 394
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Re: Frame questions
What would need to be modified for the cab mounts? I can take off my crossmember and put it on the frame. I am going to be boxing it and adding some crossmembers to strengthen it
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87 GMC Sierra 2500 4x4 350/TH350/NP203 Flow Tech long tube headers, throttle body spacer, Edelbrock Performer cam, true dual Flowmaster 40s, 6 inch Superlift suspension lift 2000 silverado extended cab stepside 5.3l. Stock for now |
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03-26-2013, 12:52 PM
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#4 |
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Registered User
Join Date: Sep 2010
Location: Kingston, PA
Posts: 394
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Re: Frame questions
Anyone one know I any other differences between the frames?
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__________________
87 GMC Sierra 2500 4x4 350/TH350/NP203 Flow Tech long tube headers, throttle body spacer, Edelbrock Performer cam, true dual Flowmaster 40s, 6 inch Superlift suspension lift 2000 silverado extended cab stepside 5.3l. Stock for now |
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03-26-2013, 01:57 PM
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#5 |
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Next!
Join Date: Jan 2003
Location: Eastern Pa.
Posts: 2,483
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Re: Frame questions
C20 frame is lite duty compared to K20, see chart unless you have C6P option
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86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck |
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03-26-2013, 05:31 PM
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#6 |
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Registered User
Join Date: Sep 2010
Location: Kingston, PA
Posts: 394
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Re: Frame questions
Thanks that's very helpful. How do I know which one I have?
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__________________
87 GMC Sierra 2500 4x4 350/TH350/NP203 Flow Tech long tube headers, throttle body spacer, Edelbrock Performer cam, true dual Flowmaster 40s, 6 inch Superlift suspension lift 2000 silverado extended cab stepside 5.3l. Stock for now |
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03-26-2013, 05:58 PM
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#7 |
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Next!
Join Date: Jan 2003
Location: Eastern Pa.
Posts: 2,483
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Re: Frame questions
Does the donor C20 have a full floating rear? If it does it Probably has the C6P option and then would have a similar frame to the K20903. C20903 is a 2wd C20 pickup, K20903 is a 4wd K20 pickup.
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86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck |
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03-26-2013, 06:36 PM
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#8 |
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Registered User
Join Date: Sep 2010
Location: Kingston, PA
Posts: 394
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Re: Frame questions
I don't think it did. Other than thickness what would be different with the frames?
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87 GMC Sierra 2500 4x4 350/TH350/NP203 Flow Tech long tube headers, throttle body spacer, Edelbrock Performer cam, true dual Flowmaster 40s, 6 inch Superlift suspension lift 2000 silverado extended cab stepside 5.3l. Stock for now |
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