11-18 Chevy/ GM 3/4 & 1 Ton Pickup
Front Suspension:  Torsion Bar/ IFS
Rear Suspension: Leaf spring/ Straight axle
Lug Size: 14mm RH
Bolt Pattern: 8x180mm
Max Stock Tire: 32x11.00 on 8 inch wheel with proper offset
Recommended Tire Size 4" Lift: 33x12.5
Recommended Tire Size 6" Lift: 35x12.5
OEM Wheel Size: 17 inch, 20 inch
Engine: 5.7L V8, 6.6L Turbo Diesel

Special Notes: GM has made some major updates on the 3500HDs. The new truck is heavier and stronger than the previous models and the updated suspension required all new suspension kits. GM has changed the bolt pattern on these trucks to a 8X180mm bolt pattern.
99-10 Chevy/ GM 3/4 & 1 Ton Pickup
Front Suspension:Torsion Bar/ IFS
Rear Suspension: Leaf spring/ Straight axle
Lug Size: 14mm 1.5 RH
Bolt Pattern: 8x6.5
Max Stock Tire: 31x10.50 on 8 inch wheel with proper offset
Recommended Tire Size 4" Lift: 33x12.5
Recommended Tire Size 6" Lift: 35x12.5
OEM Wheel Size: 16 inch
Engine: 5.7L V8, 6.6L Turbo Diesel V8

Special Notes: Some 00-02 trucks were still built with the 88-99 body style. These are called Classics and take the 88-99 kits. Most kits will also fit the Dually trucks, except that the rear components usually have to be changed around (u-bolts, blocks, etc.) to get the truck level and you will need to deal with wheel issues on spindle style kits.
88-00 Chevy/ GM 3/4 & 1 Ton Pickup
Front Suspension: IFS/Torsion bar
Rear Suspension: Leaf spring/Straight axle
Lug Size: 14mm 1.5 RH
Bolt Pattern: 8x6.5
Max Stock Tire: 32x11.00 on 8 inch wheel with proper offset
OEM Wheel Size: 16 inch
Recommended Tire Size 4" Lift: 33x12.5 
Recommended Tire Size 6" Lift: 35x12.5
Engine: 5.3L V8, 5.7L V8, 6.2L Turbo Diesel V8, 6.5L Turbo Diesel V8

Special Notes: These vehicles came equipped with hub-centric wheels. To avoid vibration problems, even though a standard wheel will fit, it is recommended to stay with a hub-centric aftermarket wheel.

Additional Note: The 1500HD 8 lug truck is still rated as a 1/2 ton truck, but has a heavier suspension and uses 8 lug wheels. This truck uses a lift kit unique to it. Standard 1500 lift kits will not fit.
73-91 Chevy/ GM 3/4 & 1 Ton Pickup
Rear Suspension: Leaf spring/ Straight axle
Lug Size: 9/16 inch RH
Bolt Pattern: 8x6.5
Max Stock Tire: 32x11.00 on 8" wheel with proper offset
​Recommended Tire Size 4" Lift: 33x12.5 
Recommended Tire Size 6" Lift: 35x12.5 
OEM Wheel Size: 16"
Engine: 5.3L V8, 6.2L Turbo Diesel V8, 6.5L Turbo Diesel V8

Real 1 Tons came with 56 inch rear springs from the factory. Some owners convert the long spring to a more common 52 inch rear spring by moving the rear spring hangers forward. The holes are usually already in the frame. These trucks came with square rear u-bolts from the factory. We run into a lot of these trucks that have been converted to round u-bolts by a previous owner. If your 1 Ton has round rear u-bolts, you will need to purchase these u-bolts separately since all of the kits contain square U-bolts. Straight axle 88-91 Crew Cabs use this kit. 88-91 3500 new body style IFS trucks use the later model kits. 

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