Question about 1985 Dodge Ramcharger

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4 wheel wont work have 3 vac line gone on pas side where do they go 85 dodge ramcharger auto

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Check vac controller on front axle these have a rotting problem on older trucks replace if rotted and check vac to controller this is a common problem on these trucks good luck p.s. this is what engages front axles for four wheel drive.

Posted on Feb 21, 2010


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The lines connect to the toggle switch, and run down to the transfer case.

Posted on Feb 03, 2010


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1985 Dodge Ramcharger Carburetor

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How many different sizes are there for the fuel line from the gas tank on an 85 dodge ramcharger

Hopefully the old lines are still in place & that will give
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Steel tubing --I assume-- your running from front to back,
until you transition to rubber or braided hose?

I would say 3/8" steel fuel tubing

No one-- meaning people who never work on vehicles,
or parts store people who disrespect your age or knowledge?

The only issue will be at the gas tank & on the engine

If it has a carb,then it may be steel all the way or some rubber
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2 Answers

Transfer case wont engage

shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
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remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

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4 wheel drive

Sounds like you need to check the adjustment of the transfercase linkage, also the shift fork in the t-case could be worn or the "shoes" on the shift rail may be wore out or gone. I have run into this on many full size rams, also the vac. lines from the t-case to the front axle get dry and cracked, losing vac. or not applying it at all. Check the vac. resivor under the hood and the source of vac. from the engine to the resivor.

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