Quote:
Originally Posted by Dead Parrot
Years ago, I worked with a guy that special ordered a 75 3/4 ton with a 1 ton rear axle because he was going to set it up with a 5th wheel hitch for his travel trailer. Possible yours was ordered or modified for similar duty. That was a time when you could do a lot of special options on a custom build truck.
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Quote:
Originally Posted by Honest Bob
1 ton brakes are JB8 and are hydroboost.
There are a few things that I could see happening.
1) Maybe it was ordered that way. These trucks seemed to be nearly completely customizable from the factory.
2) Someone swapped the rear axle with one from a 1 ton truck. The spring perches would have to be moved (I think the shocks have different mounting locations on 3/4 vs 1 ton as well.) to fit on a 3/4 ton truck.
3) Someone may have upgraded to jb8 rear brakes. I suspect this could be easily done by swapping the entire axle backing plate setup along with shoes and drums and wheel cylinders. I would think there would be brake proportioning valve and master cyl differences as well which if not have been done would cause the rear brakes to lock up well before the fronts.
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While quite customizable from a trim or comfort/convenience standpoint, they were not infinitely customizable from a brake standpoint.
The combinations would need to be tested and validated for every model series, wheelbase, CG location, tire option and GVW weight rating, which is why we had the various brake systems defined and released in buckets (ie, JB1, JB3, JB5 etc).
We wouldn't be able to sell a product that had not been fully validated especially after the FMVSS standards were put in place.
K