Heavy Half as stated will have 4 in the 4th digit of the VIN, 6th on 81-87's
HD brakes is what everyone associates with the 1.25" rotors so I used it generically.
As stated all 73-80's had these rotors standard. 81-87's had 1" Standard brakes and are the "low drag" brakes.
We are talking about making an 85 a Heavy Half, so it would have HD front brakes in addition to the HD rears Pyro pointed out, which comes with dual diaphragm booster.
If you have an post 80 and you want it to be equipped like a Heavy Half, you need all of the following:
HD suspension:
3/4 ton front springs
3/4 tons rear springs (56" long - 7 leaf)
HD Brake system:
HD 1-1/4" Front rotors
HD Dual diaphragm booster
HD 2-3/4" rear brake drums and shoes for better stopping ability
Minimal emissions equipment (you won't get away with this without the 4 in the VIN)
Larger Tires
Heavy Half would be available in any engine config, but it would effect the GVW rating.
Adding the 3/4 springs to the truck WILL alter the height along with the larger tires.
No 1/2T 81-87's came with duals, the only ones were K30 4x4 and Crew Cabs.
Quote:
Originally Posted by 87Bob
Ok now I'm more confused than ever. But I have learned a couple of things.
Please feel free to comment.
I need to get better braking front and rear.
*Larger Rotors and Calipers for the front. Does this require new spindles?
*Larger Rear Drums (2-3/4 wide shoes) Will these fit on my current rear
axle?
*Do I need to change the Power Brake Booster/Master Cylinder?
For supporting the load I need to change to a 3/4 ton set of springs or get a set of air bag helpers.
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HD brakes require new rotors and spindles. ( I can't remember on the caliper, but I think they 81-87's were different)
Rear: The backing plate is the same, everything else isn't, sans the wheel cylinder, as I am not 100% sure.
Do you NEED to change the booster, no. But the HD version is the dual diaphram version.