GMC 4000...? or 5000 series....Pictures...it's about time...

[A.T. RockDriller]

Back to what factorystock said about the " Slippery/Dry " Road selector..
It sure is what he said.....
At first I mistakenly thought it worked with the rear diff.....but no...
I had seen where the airlines from the switch dissappeared into the maze of airlines on the firewall....an then gave up and moved on..

Today....driving on a real wet, oily stretch of frontage rd near a Flying J.....
Did a couple panic stops ...with and without the selector engaged...
It seemed really effective....like a 60/40 valve on a tractor.

Kinda like early ABS...

Thanks for straightenin me out on that.

[79coyotefrg]

Originally Posted by C10 - C90 Bill

Les, the 5.75/7.75 Rear doesn't sound that bad to me. There is a guy or two over at Stovebolt that could actually figure that out for you. If you tell them the Ratio and Tire Size they can work out the math to figure out a pretty acurate MPH in 5th High.

5.75 hi range with a direct 1:1 5th gear and 9.00x 20's (I assume) which are about 39.2 inches in diameter and 3000 rpms is right at 60 mph. now if you were to run 10.00 x 20 at the same rpm would get you 62.75 mph

now to cruise at 65mph with 900x20's 5.75 hi range in 5th (direct) you would have to hold 3200 rpm.

[79coyotefrg]

what is that big red button??



my dads old truck had that. never remembered it really til I saw this thread. Dads was the same color as this truck too but had the 5 spoke dayton wheels

[79coyotefrg]

what is that big red button??



my dads old truck had that. never remembered it really til I saw this thread. Dads was the same color as this truck too but had the 5 spoke dayton wheels

[C10 - C90 Bill]

The big red button is the 4-Way Flashers.

Bill

[79coyotefrg]

Originally Posted by C10 - C90 Bill

The big red button is the 4-Way Flashers.

Bill

hmmm ok but that seems strange since it had the big rig type turn signal that you pulled out for 4ways.

[C10 - C90 Bill]

The "Red Button" is the Factory one. The Turn Signal that you have described sounds like an aftermarket one and the built-in 4-Way probably just came along with it.

Bill