I believe I read that parking brake cable difference to a 1 ton could be different because the frames are different but it also means it was prob dependant on the chassis function and the possible factory use of a prop brake depending on what it was. 1 ton crew? prob cable. But If the cables themselves are different not the brackets or whatever, I imagine the length from pedal to under cab where equalizer or adjuster would be unchanged? but the ones to the drums different length because .. well nvm i dont thing the spot the drum sat changed. Maybe it would be front part since .. no.. okay nvm i just dont know and any reasons I was about to say for why maybe it would be dont pan out. so Definitely research there if you havent.
the TSB mentioned
#88-T-151: REAR BRAKE SENSITIVITY (HEIGHT SENSING VALVE REMOVAL) - (Aug 3, 1988) MODELS: 1984-86 C/K 3500 AND 1987-88 R/V 3500 THIS BULLETIN IS A REVISION OF TRUCK SERVICE BULLETIN 85-B-79, DATED MAY, 1985, UPDATING FOR MODEL YEARS 1984-1988. 1984-1986 C/K 3500 and 1987-1988 RN 3500 series trucks are equipped with a rear suspension height sensing device that optimizes the brake proportioning valve setting for the load the vehicle is carrying. The height sensing system adjusts the brake balance in vehicles subjected to a range of loading conditions. Occasionally, vehicle modifications by body builders or owners influence the height sensing device.
If a vehicle has bad rear suspension modifications that affect its trim height or the spring rate, and the driver comments about the brake modulation characteristics of the vehicle, it is recommended that the height sensing system be removed and the brake system be revised as described below: Parts listed below are currently available from GMSPO. 1. Detach rear brake hose from lever and bracket assembly. Reference Figure No. 1. 2. Remove lever assembly and bracket from axle. 3. Install rear brake hose bracket (P/N 348978) and spacer (P/N 2355099) with a 3/8-16 x 1.38 bolt (P/N 358000 - shorter bolt removed in Step No. 2) in tbe upper cover hole. Reference Figure No. 2. Use Loctite 75 or equivalent on the bolt threads. 4. Attach brake hose to bracket with bolt from original installation. 5. Install a 3/8-16 x 1-3/4 bolt (P/N 9439637 - longer bolt removed in Step No. 2) through spacer P/N 14055556 (removed in Step No. 2) in remaining axle cover attacbing hole. Use Loctite 75 on bolt threads or equivalent. 6. Disconnect brake pipes from height sensing valve and brake hose, and discard short brake pipe. Reference Figure No . 1. 7. Remove and discard height sensing valve, bracket, and bolts. 8. Carefully reposition the rear brake pipe, and connect it to tbe rear brake hose. 9. Bleed and test brake system per Section 5 of the appropriate Light Duty Service Manual.
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