Semi-Truck Frame Chassis Parts
Need semi-truck frame chassis parts? Choose from high-strength frame rails, crossmembers, and reliable fifth wheel replacement parts to keep your rig solid. Enjoy a smooth ride with quality springs and shock absorbers. Ensure stable control with our durable control arms and steering linkages. Looking for axles or frame steps? We've got those too. Shop at 4 State Trucks!
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BESTfit Normally Closed Low Air Pressure Switch With 1/8-27 NTP Connection - Replaces FSC - 1749-2108, 1749-2134
BESTFIT TRUCK PARTS
$9.27BESTfit Normally Closed Low Air Pressure Switch Opens At 70 PSIThe low air pressure switch provided is a normally closed type that triggers at 70 PSI. Featuring a connecting thread of 1/8-27 NTP and a blade connector type, it includes threaded sealant...$9.27 -
BESTfit Torque Rod For Hendrickson PRIMAAX, FIREMAAX, Mack MAXAIR Twisted Sister AL231, AL405 Rear Air Suspensions
BESTFIT TRUCK PARTS
$93.83BESTfit 22 Inch C-C Fixed Style Torque Rod With 4.375 Inch Bolt Mounting HolesThe Torque Rod designed for rear air suspensions features a 22.00-inch center-to-center fixed style with 4.375-inch center-to-center bolt mounting holes. Sold individually,...$93.83 -
BESTfit Spacer Block For Spring Ends For Mack Rear SS34, SS38, SS44, SS50, ST34, SWS573, SW, SWS Suspensions
BESTFIT TRUCK PARTS
$8.56BESTfit Spacer Block For Mack With 4 Inch Wide SpringThe Spacer Block is designed for the spring end bushing and is compatible with various rear suspensions including SS34, SS38, SS44, SS50, ST34, SWS573, SW, and SWS. It fits SS34 and SS38 with split...$8.56 -
BESTfit Insulator Box For Spring End Bushing For Mack Rear SS34, SS38, SS44, SS50, SWS573 Camel Back Suspension
BESTFIT TRUCK PARTS
$126.99BESTfit Spring End Bushing Insulator Box - Replaces 25168110, 52QK418AP4, 52QK418BP4, R303688 & CS71632BThe Insulator Box is designed for the spring end bushing and is compatible with various suspension systems, including Rear SS34, SS38, SS44, SS50, and...$126.99 -
BESTfit Rear Trunnion For Mack SS44, SWS573 Camel Back Suspension
BESTFIT TRUCK PARTS
$366.99BESTfit Trunnion For 3.5 Inch Trunnion Shaft & 4 Inch Spring - Replaces 25130237 & 39QK55The Trunnion, suitable for SS38-44 Series, features a 3 1/2-inch shaft and comes with 1-A758 bushing. Sold individually, it does not include ears and serves as an...$366.99 -
BESTfit 7.75 Inch U-Bolt Top Plate For Mack MAXAIR - Twisted Sister AL231, AL405 Suspension 2001-2004
BESTFIT TRUCK PARTS
$41.81BESTfit U-Bolt Top Plate - Replaces 587752, 58775-002, 65084, 65084-000, 11QK497M2, R3015721The U Bolt Top Plate, replacing OE numbers 587752, 58775002, 58775-002, 65084, 65084000, 65084-000, 11QK497M2, and R3015721, is sold individually. It ships...$41.81 -
BESTfit Rear Air Spring For Mack MAXAIR - Twisted Sister AL231, AL405 Suspension 2001-2004
BESTFIT TRUCK PARTS
$263.99BESTfit Air Spring For Mack MaxAir Suspension - Replaces 9647, 58786002, 587862, 64917002, 25161909 & 57QL417MThe Air Spring, serving as a replacement for OE numbers 9647, 58786002, 587862, 64917002, 25161909, and 57QL417M, ships directly from the...$263.99 -
BESTfit 12 Inch 80 PSI Replacement Suspension Air Bag
BESTFIT TRUCK PARTS
$228.99BESTfit Replacement Suspension Air BagThe airbag is designed with a pressure rating of 80 PSI and a height of 12 inches. Its bottom plate is constructed of plastic, featuring a 2-hole top plate and a 2-hole bottom plate. The bottom plate alignment is...$228.99 -
BESTfit Shackle Hanger Replaces 68127-001, 681254-001, 68138 For Hendrickson Suspension
BESTFIT TRUCK PARTS
$117.99BESTfit Hendrickson Suspension Fits Freightliner Front AirtekThe Shackle Hanger, designed for the front, made of black steel, and suitable for either the driver or passenger side, is sold individually as an aftermarket replacement part, not OEM. It...$117.99 -
BESTfit Suspension Center Frame Bracket Replaces K272-184, K274-184 For Kenworth With AG100 Suspensions
BESTFIT TRUCK PARTS
$639.99BESTfit Suspension Frame Bracket Fits Kenworth K100, T350-T450, T600, T800 & W900The Center Frame Bracket is sold individually as an aftermarket replacement part, not OEM. It replaces OEM numbers K272-184 and K274-184. Please note that this item is a...$639.99 -
BESTfit 4 Inch Wide Parabolic Steer Axle Leaf Spring Replaces B81-1006 For Kenworth W900
BESTFIT TRUCK PARTS
$900.99BESTfit Parabolic Steer Axle Leaf SpringThe Parabolic Steer Axle Leaf Spring, sold individually, features specific dimensions: 4 inches in overall length, 1.75 inches in outer diameter, and 1 3/8 inches in inner diameter. It also has a thread size of 6...$900.99 -
BESTfit 2 Leaf Spring Replaces 03-02432, C81-6007 For Peterbilt Air Trac Suspension
BESTFIT TRUCK PARTS
$247.99BESTfit 2 Leaf Spring Fits Peterbilt Air Trac SuspensionThe Leaf Spring is designed to fit Air Trac Suspension systems, featuring 2 leaves with a hook on the second leaf for secure attachment. It has a width of 4 inches, with the short end measuring...$247.99