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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

truck problems HELP

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BUTCH

05-28-2004 11:42:10




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FOLKS I KNOW THAT THIS PROBABLY ISNT THE RIGHT PLACE TO ASK THIS BUT I'M DESPERATE FOR SOME HELP OR A TRUCK DISSCUSSION BOARD LIKE THIS THAT DISCUSSES TRUCK PROBLEMS. PROBLEM I HAVE A 1978 FORD F700 TRUCK THAT HAS A 2 SPEED REAR END THAT DOSEN'T SEEM TO BE SHIFTING I HAVE KNOW WAY THAT I KNOW OF TO CHECK THIS THING ANY ADVICE WILL BE GREATLY APPRECIATED
THANKS A LOT




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woodsman

06-01-2004 09:08:32




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
Just as an extra note, I have the same truck and the shift motor in back has a set of points in it that get dirty sometimes and will keep it from making a complete shift.



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David in Ga.

05-31-2004 06:32:17




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
PLEASE! When testing ALWAYS block the wheels and dont ever test or get under the truck with it running. One of my neighbors got crushed last week when his was stuck between gears and he got in front of the rear wheels to look under and it slipped into gear.He was a saftey concious person and had the wheels blocked. We all need to always take that extra second when doing such things, dont bet your life on a short cut.

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garyp

05-30-2004 19:52:22




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
butch,a lot of those two speed rear ends had a fuse in the fuse box-marked as a 2 speed axle.
also,as old as yours is it could very well be worn out.
rebuilt 2 speed motors are very common and easy to find.
they're also relatively inexpensive.
the last one i bought was around '84or'85-i think that it sold for around $35.00.
i would guess at today's prices it woild probably run in the area of $100.00 or less

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tinman

05-30-2004 21:25:38




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 Re: Re: truck problems HELP in reply to garyp, 05-30-2004 19:52:22  
Check the fuse block for a breaker and also behind the right seat there should be a relay. Most of the time it is the relay and/or the motor bad.



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Harold H

05-30-2004 19:14:54




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
There is a "Classic Trucks" forum on this same site. It is a t the bottom of the list of forums.

Harold H



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JR

05-30-2004 14:38:17




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
When you say. it isn't shifting do you mean not from high to low or its stuck in nuetral ??. one method to check if the motor is working is to find in line connector right after the motor some where around teh rear axle, seperate and with 12 volt battery some wire, put a line from (-) on battery to some where around motor for ground then (+) on battry to open connector and see if you can manualy flip from high to low.

If you can't you kno with motor, if you can then its your line from there back to the switch in the cab or the switch.

hope this helps,

JR

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Steve in MN

05-28-2004 15:40:26




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 Re: truck problems HELP in reply to BUTCH, 05-28-2004 11:42:10  
Most of them had an electric motor mounted on the rear end that ran the shifter fork back and forth inside the axle housing... with the engine off, but the key "on", have somebody flick the two speed shifter knob back and forth while you listen under the truck - you'll be able to hear it shift if everything is OK. It's usually a wire that got knocked off somehow. Some of the old two speeds were vacuum shifted, but the principle is still the same.

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butch

05-30-2004 07:14:54




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 Re: Re: truck problems HELP in reply to Steve in MN, 05-28-2004 15:40:26  
HEY STEVE THANKS FOR THE INFO I.LL HAVE TO TRY THAT .
AGAIN THANKS



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Bob

06-01-2004 00:07:04




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 Re: Re: Re: truck problems HELP in reply to butch, 05-30-2004 07:14:54  
There will be 2 terminals on the shifter. Make sure the metal case is grounded, and apply 12 Volts to one of the terminals, and then to the other. The motor inside should run a complete shift cycle in either direction, and then shut off.

If the cab-mounted switch is good, and has power to it, and the wires are good to the shifter, and it still doesn't shift when you jumper it as above, you have internal problems in the shift unit, usually a bad limit switch or shift motor.

There is a rubber seal between the shifter and the axle, to prevent the #10 motor oil in the shifter from mixing with the 90 gear oil in the rear axle. These often tear, and the heavy oil in the shifter adds to your problems.

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butch

06-01-2004 04:57:03




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 Re: Re: Re: Re: truck problems HELP in reply to Bob, 06-01-2004 00:07:04  
HEY GUYS THANKS A MILLION PROBLEM SOLVED HAD BAD CONNECTION AT SHIFT SWITCH
THANKS
BUTCH



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