the 2 speed rears essentially have a planetary system which can either be in direct or in reduction. so really its quite similar to a gear vendors except its contained in the rear end instead of stand alone, the control button has been robbed from the old 2 speed diff system.things is they are a very heavy diff and the diff is what is called unsprung weight. unspring weight typically has 2x the negative effect on ride as spung weight which is why they never became popular on light vehicles

 

Wow. Zombie thread form the beyond. Only 7 yrs old... But very interesting...

 

I posted in it then...might as well post in it now.

 

Well said! You have to understand how your equipment works to get the best out of it. I would really like to see some pictures of this 59 Ford.

 

"How does a posi traction rear end in a Plymouth work? It just does!" Sorry, had to get Joe Dirt quotes out of my head.

Seriously, I love a "splitter" Our 89 F-700 Dump truck has one & it is nice pulling hills loaded.

 

yup the splitter works very well, like anything else they can break and need repair, but generally they don't cause anymore problems than any other drivetrain component. used splitter in a chevy firetruck and it shifted just fine, course it had a bit of a weird gear overlap in the main box so in third high you went to 4 high instead of 4 low like you would think.(only gave you 8-9 gears not 10) once you understood the real order of gears it was just fine. over the years i've driven just about every heavy duty tranny used since about 1970 and there is stuff way stranger than a 2speed diff. try a 15 double over where 4 and 5 position are reversed, or a machk airshift where reverse is on the air button and you have 5 reverse speeds if you want to fool around, or 5and 4's where you have 2 sticks for double the fun

 

I've seen that. I had to do a double take.