MY 1969 PETE ON YOUR STEPDECK? SHOT IN THE DARK!!

Oscar the KW · Mar 16, 2016

BIGZILLA said: ↑

I DIDNT SAY THEY DID!!

Omg. I'm just saying if, and I don't know this to be true, IF there is a reduction in gear between the front driveshaft and that first drive axle then the front driveshaft and rear driveshaft will not spin at the same rate. I'm not an idiot I don't think the Two rear ends are going to spin at different Velocities.
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I wasn't talking about the rears spinning different from one or another, I was talking about the drive shafts.

BIGZILLA · Mar 16, 2016

Oscar the KW said: ↑

I belive that is the power divider.
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Oscar the KW said: ↑

I wasn't talking about the rears spinning different from one or another, I was talking about the drive shafts.
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So does the rpm change within the power divider? does it change the rpm going into the front drive axle?

BIGZILLA · Mar 16, 2016

BIGZILLA said: ↑

So does the rpm change within the power divider? does it change the rpm going into the front drive axle?
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If not what does it do?

BIGZILLA · Mar 16, 2016

Ooh, after a few searches I know what a power divider is. Is that the power divider in the picture?

I'm just trying to learn something here. At least I'm willing to say "I don't know". The scary ones are the ones who act like they know more than they do.

austinmike · Mar 16, 2016

Very interesting old truck. all that two stick stuff was way before my time

BIGZILLA · Mar 16, 2016

austinmike said: ↑

Very interesting old truck. all that two stick stuff was way before my time
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Thanks!
Obviously I don't understand any of it. But I want to.

johndeere4020 · Mar 16, 2016

ColoradoGreen said: ↑

You have a 13x4. No larger than a 12713 or so on the 13-speed, without seeing a data-plate or even a box, it's near impossible to say the precise type of 4-speed you have.

Post a photo of the driveshafts.

Being a 13x4, the truck is set for heavier work, it may have had a winch at some point or another, as the 4-speed would allow for a power-tower, or an auxiliary-mounted PTO that you could leave the mainbox (13-speed) in gear and control the speed (be careful doing this).

The shift pattern for the 4-speed should be an H-pattern with a horse-collar, like so:

DU (1) OD (4)
|_____|
| |
UD(2) Dir (3)

Gears are DU: deep-under (1st), UD: Under-drive (2nd), Dir: Direct (3rd), and OD: Overdrive (4th)

You can find out, without a data-plate, whether or not it's a proper deep-reduction deep-under box by shifting from deep-under to underdrive. If it has the ultra-low deep-under (2.37:1) hole it'll be about a 1000-rpm shift. If it's a relatively shorter shift, it's likely a progressive auxiliary.

Because your's is mated two a 13-speed, it's most useful to effectively, if doing heavy work, to treat the auxiliary as a two-speed rear, shifting between underdrive and direct.

Deep-under, whether in this set-up or a 6x4 like my truck, you don't use once you're out of it. It's strictly an ultra-low starting hole gear. If you were in a higher gear in the main, trying to downshift to the deep-under hole would be the equivalent of dropping two gears on the 13-speed.

There's two problems with utilizing the overdrive gear all that much with your set-up: bearing-speed and driveshafts (this is why it'd help if you posted a photo of the driveshafts).

Assuming your 13-speed (the mainbox) is a 12713, it's going to have an 0.81 overdrive gear, more than likely, the overdrive in the aux will be between 0.90 and 0.80, giving a compound overdrive gear in the neighborhood of 10% higher than modern 13-speeds (top two OD, 0.81 and then 0.73).

That means two things: the bearings, and the driveshaft, will be spinning immensely fast in overdrive. If this was a retrofit, which I imagine it is, then the driveshafts might not have been updated. I wouldn't imagine you have anything heavier than standard-wall 1210, MAYBE 1410 driveshafts. The lighter driveshaft won't like spinning that fast, as you'll be looking at in excess of 3000-rpm in the big hole at 2100rpm.

The bearings in the auxiliary will be spinning at immense speed, as well, in that hole.

The backside, generally you don't want to utilize OD in the auxiliary as much when you're in underdriven gears in the main (anything lower than direct gear). Here and there won't kill it, but, a sharp torque load from the engine with the main (13-speed) in a lower gear where it's multiplying torque could potentially wreak havoc on the auxiliary if it's in OD. If you're going to put it in OD in the aux while in a lower mainbox gear, don't just stand on the throttle, walk into it (you should always drive this way anyway). Direct gear on the main (top hole, splitter in DIR) and the OD on the aux won't notice a thing, no multiplication of torque.

Make sure you square on the corners on the horsecollar shift (2nd to 3rd), if you don't you'll bind the linkages to the auxiliary, and you'll need a bar to pop them loose. Considering the age of the tractor, the linkages are likely worn, meaning it's more susceptible to this, square the corners like you're drawing three sides of a square.
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After reading this my question would be, when both transmissions (or any transmission for that matter) are in OD shouldn't eveything spin slower not faster? Your rearends and tire/wheel size will determine drive saft speed. Everything that's ahead of the tail shaft of the brownie will be going slower in OD than it will than the drive shaft which should be the fastest part.

Oscar the KW · Mar 16, 2016

BIGZILLA said: ↑

So does the rpm change within the power divider? does it change the rpm going into the front drive axle?
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Why would it change? You seem convinced that the rear shaft turns faster than the front one, why? The only way that rear shaft can turn faster than the front one is if the rear differential has a shorter gear ratio (front 3.70 rear 4.10) and if that were the case it would destroy something.

BIGZILLA said: ↑

If not what does it do?
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A power divider splits the power evenly between the two drive axles. For example, if you've ever been off road in rough or uneven terrain and spun out, if you lock the power divider in it will supply power to both axles evenly, as long as one axle has traction at both wheel ends you will be able to move.

BIGZILLA said: ↑

Ooh, after a few searches I know what a power divider is. Is that the power divider in the picture?
Click to expand...

For the third time, yes, I believe that is what is bolted to your front differential, it has an air line going to it on the left side of the picture. There should be a switch in the cab that activates it.

BIGZILLA said: ↑

I'm just trying to learn something here. At least I'm willing to say "I don't know". The scary ones are the ones who act like they know more than they do.
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I'm not sure who you were taking a shot at there, don't really care. But I do know this, I have seen people get an attitude like that here before, and the next time they ask a question they hear crickets, or worse get a bunch of smart ### replies.

BIGZILLA · Mar 16, 2016

Oscar the KW said: ↑

A power divider splits the power evenly between the two drive axles. For example, if you've ever been off road in rough or uneven terrain and spun out, if you lock the power divider in it will supply power to both axles evenly, as long as one axle has traction at both wheel ends you will be able to move.
Click to expand...

Thank You. Seriously Thank you.

Oscar the KW said: ↑

For the third time, yes, I believe that is what is bolted to your front differential, it has an air line going to it on the left side of the picture. There should be a switch in the cab that activates it.
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I thought you weren't sure because of the wording.

Oscar the KW said: ↑

I'm not sure who you were taking a shot at there, don't really care. But I do know this, I have seen people get an attitude like that before here, and the next time they ask a question they hear crickets, or worse get a bunch of smart ### replies.
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I truly wasn't taking a shot at anyone except myself. If my frustration came across as anything else I apologize. I'm in way over my head here and it is frustrating.

Zeviander · Mar 16, 2016

ColoradoGreen said: ↑

*snip*
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When @TripleSix said the "Dean of 2 stick trucking" he wasn't kidding.

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