hillconst1

That was the Eaton 3 speed tandem axle setup you're referring to.

1 was both axles in low, 2 was 1 axle in low and 1 axle in hi, and 3 was both axles in high.

Those used a conventional spider gear type inter axle power divider though, and not the cam & wedge type power divider like the Mack tandems.

A spider gear type power divider will not clunk or bang if there is a difference in axle ratios or tire sizes the way a cam & wedge type power divider will.

That's why with "brand X" tandem setups you can match the tires the same across each drive axle without concern for any discrepancy in diameter from front drive axle to rear drive axle, whereas on a Mack tandem, you must match tires the same front and back on one side and then do the same on the other side so there is not a great difference in average tire diameter from front drive axle to rear drive axle(keeping the larger 4 on the curb side to compensate for road crown).

Eaton 3 speed worked as follows

LO-both rears in low range

Intermediate-one rear in high the other locked out

High-one rear in high the other locked out

Basically two two-speed rears with the same low ratio and different high ratio

were 335 cummins engines reliable? What are the differences between a 262 and a 335? Are there any known problems to making a b73 into a b773 by simply installing a 335 as long as it has the cast radiator.

Thanks

Hi,

I have two trucks with duplex transmissions, one is a trd720, the other is a trd72. I will start with the trd720, this is simple, 5 speed box with low and direct rear box, this trans has 5 progressive ratios, with no overdrive, so it is shifted 1st, low then high, 2nd low then high, and so on, 10 gears... the other trans screws things up some, the front box has 5 progressive ratios BUT 4 th is direct and 5th is overdrive( also known as overgear) and has the some low and direct two speed box on the rear. This will give yo 10 gears right? well yes and no, 4th gear in direct is 1.0 to 1.0 ratio, ( input shaft turns 1 turn output 1 turn). now if you shift into 5th low the main box is in over drive( 0.69 to 1) but the low gear in the 2 speed box lowers the ratio, this will give you a ratio of 1.04 to 1 , almost the same a 4th direct, so you have no need to use this gear sence it is the same a 4th high and uses two gear reductions to get the same ratio as conecting the input shaft to the output shaft. So the the proper shift for the 9 speed overgear trans is the same as the 10 speed other than you omit the 5th low because it is a duplcate ratio. If thats not enough for you you can get into your trdx72 and trdx720 trans, these trans. have a very low gear in 1st. for heavy work, this realy misses up things, this trans you have to shift very differently than the other two. All 4 of these transmissions are duplex transmissions. So I would say that all of you are correct. I believe that is why all of these trucks have those little tags up by the sun visor, there are so many variations, it just comes down to what your truck was designed to do, and if the guy that ordered the truck knew what he was doing. Fred

p.s. the triplex and the quadraplex have some duplicate ratios also because of the overgear 5 speed front box and overdrive in the rear box.

You are exactly right, a quad is not a quad. Not all quads used the same sequence hence 14spd, 18spd, 20spd. You have to know your ratio list before you can figure out what you can use and what you can't. I bought a '60 B613 witha 20spd when I was 18 yrs old and had it down in no time. Once you get the feel it sure is a lot of fun!

I just sold my '88 RW713 E9 500 (out of a Magnum) 12 spd. I loved the truck and an e9 will definately outpull a 460 especially if it has been tweeked. I had 4.42 rears on 11R24.5 tires and the motor was set to 2100rpm. Top speed was about 75mph but it would pull with anything, it just liked fuel too much and mine was very reliable, but repairs get very costly!

I believe you could order different colors for a B interior but green was standard except for fire trucks which were red.

Thanks

To my knowledge all 350's used frontal air to air. I also think all mack engines after 1981 used air to air except for 237's.

Were all b model cab interiors green from the factory or were there exceptions?

Could someone please tell me the particular cummins engines offered in each of the respective models?

B733-, B77-, B773-

Thanks