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#1 |
Registered User
![]() Join Date: Feb 2013
Location: Spring Hill, Florida
Posts: 465
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C20 to C30 conversion?
Hi all, my Buddy Steve has a 70 C20 that he is working on converting to a 1 ton. He is wanting to convert the front end to work with Dually rims, and convert to disk Brakes. He is looking for a parts truck and trying to figure out what year range will work. I know the heavy trucks tended to lag behind the model changes of the half ton stuff.
If anyone knows what years will work let me know, also is it a simple cross member swap like in a c10 or is there more to it? |
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#2 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,280
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Re: C20 to C30 conversion?
It would be the cross member swap just as if it were a C-10 just 3x's as heavy[in both senses
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#3 |
Registered User
![]() Join Date: Feb 2013
Location: Spring Hill, Florida
Posts: 465
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Re: C20 to C30 conversion?
Cool thanks I will pass on the info!
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#4 |
Senior Member
![]() Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,499
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Re: C20 to C30 conversion?
I think in 75 the front brakes became a little bigger so it may be of benefit to get 75+
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#5 |
Registered User
Join Date: Jul 2011
Location: WV
Posts: 946
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Re: C20 to C30 conversion?
Do a double check. I have been thinking on this very same thing on my 72. As far as I can figure, you SHOULD just be able to swap rotors if your truck is disc now. If not, you should be able to do a spindle swap. On the back, I was looking at a D70 from a 73 up.
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72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold ![]() 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD |
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#6 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,507
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Re: C20 to C30 conversion?
Unless he is starting with a Longhorn C20 he can't just bolt on parts and "make it" a one ton. The C30 frame is heavier and has a longer wheelbase than a C20 (non-longhorn). The difference is 6" and accounts for the bed forward stretch.
If all he wants is a 8' bed dually, then he can bolt on the parts up front as with a crossmember swap. Out back the rear will need a later wide track dually rear unless he wants to go with a tucked. However if you do that then it gets pretty narrow between the housings and there is still a little tire hanging from the conversions I have seen. C Blazer C10 115 C10 127 6.04" height 2.53" flange width 0.156" thick 2.98 section modulus C20 127 6.11" height 2.46" flange width 0.194" thick 3.71 section modulus C20/30 133 (Longhorn) 7.20" height 2.77" flange width 0.194" thick 5.05 section modulus
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#7 |
Registered User
![]() Join Date: Feb 2013
Location: Spring Hill, Florida
Posts: 465
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Re: C20 to C30 conversion?
His 20 is a longhorn. His bed was rotted out so he built a flat bed for it.
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