C20 to C10 suspension spring hanger holes.

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jsigl

Junior Member
Joined
Dec 13, 2022
Posts
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Location
Tomahawk Wisconsin
First Name
Jonathan
Truck Year
1980
Truck Model
C20
Engine Size
350
I see posts that GM punched hole in the frame for the 52 and 56 inch leafs. I’m looking at mine and I’m not seeing another set of holes. Is this not on all of them? Looking to switch to 4 leaf and I am seeing them in 52 inch not 56 inch.
 

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75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,038
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1,833
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
My ‘75 K25 has 52” HD (7 leaf?) springs. I have not checked to see if there is another set of holes for the longer springs.
 

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