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Any engine has a constant volume expressed in cc or ci. RPM x volume then divide by two eqals CFM at atmospheric standard pressure and temperature. That results in a specific Mass Air Flow which is an expression of weight not volume. To get more HP you need more air mass in a specific volume...

Can tell you from trying it on my sig. The axle stub is a different diameter where the bearing is, and a different offset to the end of the stub axle so inner bearing has different ID and hub sticks out too far. Backing plates are dished and need 2+" of spacer to line up with the drum. I was...

Just saw your post about the PS, sounds like that's part of the problem.

Can you turn the fronts when stopped at idle?? If so, pump pressure is up. ABS, if you also feel shudder when hard braking then the ABS is kicking in and it don't get any better. Auto adjusters--when working--do not adjust in fine increments so doing a manual check will probably always...

Corporate wisdom is like military intellegence--contradiction in terms. All I know is that if you load your rig to max and turn off the ABS all four wheels should lock at the same time. That puts you at the limit of the tires. You also need to remember that towing is a different animal, might...

There are also 1" versions out there that also fit and are the cheapest, so some trucks may have them due to a cheap PO, or just due to an oops.

A 20% increase in rear brake power can be had for under $30. There is a 1 3/16" dia. wheel cylinder used on some 1 ton 454's that fits perfectly on all models with smaller diameter wheel cylinders. Some are 1" and others are 1 1/16". Here are part numbers: Brakeware 33708 Wagner F79768...

Getting back to the subject proportioning valve--if working properly, they are kind of load sensitive in reverse, light load needs less pressure so they don't back off the rear, heavy load--pressure goes up and then they back off the rear. Think about that for a bit----totally backwards...

Found the baggie: Brakeware 33708 Wagner F79768 Bendix 33708 Raybestos WC37337

AutoZone---$13 each--lifetime. Not sure of exact year/model tho, came up for 3 1/2" shoes.

Different direction----You said whining sound and tach jumping, belt/alternator/idler bearing?? Tach is driven from alternator. If voltage also jumps radically the ECM may be shutting down---fuel solenoid would close killing engine. Soon as voltage stabilizes and you restart all OK till the...

FWIW, I live way out gravel/dirt road from hiway and 30 miles of mountain roads to get to town. Also haul water, 500 gal bed tank, on same back roads. Getting my sig truck ready as a B/U to an old Ford that's real tired. Driving empty--once around shudder from front and nose dive, rear...

Thanks for clarifying Ferm, as I said, couldn't 'member where I got it zactly, but the text said it was the stock GM chart. Would have to believe that any spike is intentional by GM tho. ECM should be fast enough to dump the waste gate pretty quickly and the MAP is certainly gonna be quick...

Hey Turbine, here is some input for your 'howzit wurk' post: The GM pressure chart shows 7psi from idle to about 1200 at any "throttle" setting. (TPS or eq). Holds that 7psi at half throttle to about 1500. From those points it ramps up as TPS and load increase to max of 11.5 at wot, max load...

According to my diagrams, the +12 is Light Blue/Black, also goes to EGR valves if you got em. ECM wire is Yellow and goes to pin A3. More than about 2" vacuum loss at output of the solenoid at idle says it's probably bad.

Carl, you said you can see the actuator move when the engine is revved??? Should not!! The vacuum source is the pump---NOT engine vacuum--isn't any!! You probably have either a bad vacuum pump or leaky vacuum lines. The vacuum pump should produce 16-20" at idle and go up from there...

Ferm, I just went thru this, got code 78 pulling out to pass, touched 90 at Wot. First, the waste gate actuator gets full vacuum to start out with, the control solenoid REDUCES vacuum to allow the waste gate to open. My problem was not that the vacuum was not dropping when it was told...

The star wheel on these is fairly coarse so they do not adjust in small increments. While I had these apart and being re-assembled I worked the system--does fine. HOWEVER--only the rear shoe works the actuator. When you are going forward the front shoe binds up rotating both shoes keeping the...

War, you posted that the adjuster wasn't working. If the spring at the botton of the shoes is installed wrong way around it will prevent the adjuster arm from cogging the wheel.

Upon inspection and measurement, the wheel cylinder bore diameter was 1" even. I think it was supposed to be 1 1/16. I have a new set of 1 3/16" and I measured the center to the backing plate and they are the same. So, at least that's not a waste of money, and, should improve the rears...