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1948 Ford F6 two speed rear end - High/Low

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  #16  
Old 09-17-2016, 08:00 PM
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My bad. I re-read the factory instructions, and yes, they do make sense.
 
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Old 09-17-2016, 08:21 PM
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Originally Posted by Mixer man
I would have another look at that tee to see if it is attached to the firewall. It looks like it may have spun around.
It's attached to the engine compartment, and doesn't spin.

I have one vacuum line to the speedometer, and one to the wiper motor.

I capped off the line to the tank.
 
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Old 09-17-2016, 08:22 PM
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Originally Posted by Mixer man
My bad. I re-read the factory instructions, and yes, they do make sense.
which instructions? The test? The test will not work with the engine off. The system vacuum will drop after it is off.

So I'm not sure how it would work.
 
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Old 09-17-2016, 09:14 PM
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Originally Posted by chrislynn5
It's attached to the engine compartment, and doesn't spin.
Ah ha! Look on the inside of the cab and you will see a big nut with a 1/8" pipe plug in the middle.

I have one vacuum line to the speedometer, and one to the wiper motor.
Correct, and the wiper hose goes all the way back to the engine manifold, correct?

I capped off the line to the tank.
I saw that. You won't be able to test your system integrity with it capped. Have you looked closely at those vacuum hoses? Are they really garden hoses?


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Old 09-17-2016, 09:21 PM
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Originally Posted by chrislynn5
which instructions? The test? Yes.

The test will not work with the engine off. The system vacuum will drop after it is off.
According to the "test", the residual vacuum should hold the axle in high range for about ten minutes after the engine is shut off. After that it's a moot point.
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  #21  
Old 09-17-2016, 09:22 PM
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Originally Posted by Mixer man
1234567890
No on the garden hoses These are lined hoses.

I'll snap some pics of the cab lines, yes one comes in and looks like a big nut then goes to the speedometer. Another comes into the cab and goes to the wiper.

Thanx.
 
  #22  
Old 09-17-2016, 09:24 PM
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once I turn off the ignition, the lever begins to drop immediately reverting back to low.
It doesn't hold at all.
 
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Old 09-17-2016, 09:41 PM
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The "splitter" valve also incorporates a check valve. That and the tee might have to be taken apart and cleaned. Easy to do, but don't loose any of the parts because spare parts are non-existent.
 
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Old 09-17-2016, 09:50 PM
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  #25  
Old 09-18-2016, 12:39 AM
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Originally Posted by chrislynn5
Also, is there a motorized version of the Axle vacuum shift assembly? That would take it off the vacuum dependency.
Howdy,

There is. The Eaton 1350 I have for my F-600 had a vacuum actuator on it and I changed it to an electric one. I was able to buy a complete rebuild kit for it too. Evidently it was used for many years, You would probably need a 6v motor unless you're changing to 12v.

Regards,

Rick
 
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Old 09-18-2016, 11:51 AM
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Originally Posted by chrislynn5
Also, is there a motorized version of the Axle vacuum shift assembly? That would take it off the vacuum dependency.
Yes there was but it could be challenging to round up all the bits. I would check with Chuck's Trucks on this.


Eaton 2 Speed: Parts & Accessories | eBay


I was surprised to learn that there was also a manual version that used a pull cable with a latching lever under the dash.
 
  #27  
Old 09-19-2016, 11:30 AM
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Originally Posted by Mixer man
Yes there was but it could be challenging to round up all the bits. I would check with Chuck's Trucks on this.

Yeah. I had to buy a used complete axle that was set up electric (but the ring gear was severely rusted and pitted.

Then I bought a ring and pinion from CT that he said was "a little pitted" that turned out to be severely pitted and unusable (he said the pits would "hold more oil"......yeah.....)!

So ended up getting a complete "third member" from a truck parts outfit in Seattle. The rebuild (shift) kit came from Coast Truck Parts in Ventura Ca. They actually had it "on the shelf" complete with a new 12v motor!
 
  #28  
Old 09-26-2016, 02:25 PM
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I am able to put it into High gear! She goes about 5-10 miles an hour faster.

Does anyone know the trick to getting better performance going up hills?
It seems even in lower gears to struggle. And the gear sounds like it's winding out.....


Thank you.
 
  #29  
Old 09-26-2016, 02:40 PM
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Originally Posted by chrislynn5
I am able to put it into High gear! She goes about 5-10 miles an hour faster.

Does anyone know the trick to getting better performance going up hills?
It seems even in lower gears to struggle. And the gear sounds like it's winding out.....


Thank you.
I don't remember what engine you have, if it's a flathead 6, you're not going to get stellar performance! If it's a big (flat) V-8, you'll do better but those engines didn't make a LOT of HP and torque out of the box.

If you want more power you'll need something with a little more HP. (my F-600 came stock with a 223 cu-IN 6.......I have a 292 Y-block now)

Another fairly low cost alternative could be a much newer 300 cu-in 6. (my second choice after the 292-Y) They even put them in the F-600's in the 60's and truck wrecking yards will have them sitting on the shelves.

The other advantage of going with a 300-6 is you can also directly bolt it to a MUCH more modern ZF 5-speed trans and you can install a parking-brake unit on the back like the one I have on my E4OD. (The ZF-5 speed and tail mounted parking brake was standard equipment on the F450/550 in later years, and depending on the integral bell housing, was made to work with the diesels, 300, and modular V-8/V-10 engines etc.....)

An F-6/600 with a 2-speed Eaton, 300-6 and ZF-5 speed would be a sweet ride!

Cheers,


Rick
 
  #30  
Old 09-26-2016, 03:04 PM
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The spur gear 4 speeds will whine pretty loud in any gear but 4th, but especially in 3rd. It is perfectly normal, part of the fun in driving these old trucks. Be sure that when you go up a hill with the axle in high range that you let your foot off the gas pedal before you crest the hill or the axle will jump out of gear when the gear pressure is off cresting the hill. Also, 3rd high and 4th low are almost identical with the 5.83-8.11 axle, so split shifting between 3rd and 4th is pointless. These engines do lose a lot of speed on hills, especially if you have anything on the truck. With a V8, 5.83 gears in high and 8.25-20 tires your truck should do 55 mph easily. I would think with your "H" six you should be able to do as well.
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