Re: Safe Highway Speed

Posted by Tim Cole On 2022/7/31 15:37:19

Let's take a look at some numbers.

At 60 miles per hour with the standard 4.41 rear axle that motor is turning around 2900 rpm which is really cranking.

But that's not the whole story. The wear index for that motor (which takes into account piston speed) is around 70.

For comparison a full size modern car has an index in the high twenties. That is one reason these modern cars can go 500,000 miles.

Thus, for any high speed use an overdrive is a necessity. Those crankshafts have seen a lot of work over the years and they can crack and bend.

The safety aspects of speed in that car are not that much different than a modern car. Above 65-70 mph all the modern safety devices are mostly going to result in a slow death. I don't get any arguments like "I crashed my truck at 90 and am doing great."