YJ Transfercase vacuum switch

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CarGuru > Jeep Willys > YJ Transfercase vacuum switch 21 March 2005 10:04:31

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YJ Transfercase vacuum switch
Big95yj 17 March 2005 05:59:49
	I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested the shift motor and it seems to hold the vacuum. I changed the gear oil in it today and cleaned the shift motor, still nothing. Then i read about the vaccuum switch on the transfer case being the possible culprit and I immediately pulled the switch. The check valve ball moves, but it is very stiff and slow to return. Does anybody know how this swith is supposed the react? Also, it does seem that my Jeep stopped going into 4wd when it got cold outside, but there has not been warm enough weather yet to test that theory here. Thanks for the help.
		Add comment


RoyJ 17 March 2005 06:51:19 [ permanent link ]
	the ball should snap back immediately. Get a new one from the dealer, less than $20. big95yj wrote:> I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested> the shift motor and it seems to hold the vacuum. I changed the gear oil> in it today and cleaned the shift motor, still nothing. Then i read> about the vaccuum switch on the transfer case being the possible> culprit and I immediately pulled the switch. The check valve ball> moves, but it is very stiff and slow to return. Does anybody know how> this swith is supposed the react? Also, it does seem that my Jeep> stopped going into 4wd when it got cold outside, but there has not been> warm enough weather yet to test that theory here. Thanks for the help.>
		Add comment


Big95yj 17 March 2005 07:06:50 [ permanent link ]
	Thanks for the help. I will do that tomorrow.
		Add comment


Mike Romain 17 March 2005 18:30:39 [ permanent link ]
	Ok... I don't understand. Do you mean you physically cannot move the shifter so you cannot get into 4x4. If so no vacuum switch is going to help there...... But if the 'idiot' light just isn't turning on, then you could likely need a new switch, they fail a lot it seems. The light has no bearing on the reality of being in 4x4 or not. Our light is stuck on so it 'thinks' it is in 4x4. My shifter say it is 'really' in 2 WD and only the 2 rear wheels spin. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's big95yj wrote:> I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested> the shift motor and it seems to hold the vacuum. I changed the gear oil> in it today and cleaned the shift motor, still nothing. Then i read> about the vaccuum switch on the transfer case being the possible> culprit and I immediately pulled the switch. The check valve ball> moves, but it is very stiff and slow to return. Does anybody know how> this swith is supposed the react? Also, it does seem that my Jeep> stopped going into 4wd when it got cold outside, but there has not been> warm enough weather yet to test that theory here. Thanks for the help.
		Add comment


Matt Macchiarolo 18 March 2005 05:46:38 [ permanent link ]
	He's probably concerned that the front axle disconnect isn't engaging. "Mike Romain" <romainm@sympatico.ca> wrote in message news:4239948F.59A92AA@sympatico.ca...> Ok... I don't understand.> Do you mean you physically cannot move the shifter so you cannot get> into 4x4. If so no vacuum switch is going to help there......> But if the 'idiot' light just isn't turning on, then you could likely> need a new switch, they fail a lot it seems.> The light has no bearing on the reality of being in 4x4 or not. Our> light is stuck on so it 'thinks' it is in 4x4. My shifter say it is> 'really' in 2 WD and only the 2 rear wheels spin.> Mike> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00> 88 Cherokee 235 BFG AT's> big95yj wrote:>> I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested>> the shift motor and it seems to hold the vacuum. I changed the gear oil>> in it today and cleaned the shift motor, still nothing. Then i read>> about the vaccuum switch on the transfer case being the possible>> culprit and I immediately pulled the switch. The check valve ball>> moves, but it is very stiff and slow to return. Does anybody know how>> this swith is supposed the react? Also, it does seem that my Jeep>> stopped going into 4wd when it got cold outside, but there has not been>> warm enough weather yet to test that theory here. Thanks for the help.
		Add comment


Mike Romain 18 March 2005 07:08:04 [ permanent link ]
	The 95 is a full time axle isn't it? Mike Matt Macchiarolo wrote:> He's probably concerned that the front axle disconnect isn't engaging.> "Mike Romain" <romainm@sympatico.ca> wrote in message> news:4239948F.59A92AA@sympatico.ca...> > Ok... I don't understand.> > Do you mean you physically cannot move the shifter so you cannot get> > into 4x4. If so no vacuum switch is going to help there......> > But if the 'idiot' light just isn't turning on, then you could likely> > need a new switch, they fail a lot it seems.> > The light has no bearing on the reality of being in 4x4 or not. Our> > light is stuck on so it 'thinks' it is in 4x4. My shifter say it is> > 'really' in 2 WD and only the 2 rear wheels spin.> > Mike> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00> > 88 Cherokee 235 BFG AT's> > big95yj wrote:> >> I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested> >> the shift motor and it seems to hold the vacuum. I changed the gear oil> >> in it today and cleaned the shift motor, still nothing. Then i read> >> about the vaccuum switch on the transfer case being the possible> >> culprit and I immediately pulled the switch. The check valve ball> >> moves, but it is very stiff and slow to return. Does anybody know how> >> this swith is supposed the react? Also, it does seem that my Jeep> >> stopped going into 4wd when it got cold outside, but there has not been> >> warm enough weather yet to test that theory here. Thanks for the help.
		Add comment


Old Crow 18 March 2005 14:25:53 [ permanent link ]
	On Thu, 17 Mar 2005 22:08:04 -0500, Mike Romain <romainm@sympatico.ca> wrote: The 95 is a full time axle isn't it?> Mike Nope, the '95's got the vac disconnect. So does the '94. Other years, I cannot say, but those two are parked in the driveway. Does anyone know if the vac switch on the t/case is the same one that GM uses in the S-10's? If so, I've got a whole drawer full of 'em that I'll sell cheap. -- Old Crow '82 Shovelhead FLTC 92" 'Pearl' '95 Jeep Wrangler YJ TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2
		Add comment


Mike Romain 18 March 2005 18:27:10 [ permanent link ]
	Ah, then he knows where to start looking. At the vacuum lines going to the front axle. Likely one is just off or one of the plastic lines has cracked or been eaten by battery acid or melted on the exhaust cross over. Mike Old Crow wrote:> On Thu, 17 Mar 2005 22:08:04 -0500, Mike Romain <romainm@sympatico.ca>> wrote:> The 95 is a full time axle isn't it?> > Mike> Nope, the '95's got the vac disconnect. So does the '94. Other> years, I cannot say, but those two are parked in the driveway.> Does anyone know if the vac switch on the t/case is the same one that> GM uses in the S-10's?> If so, I've got a whole drawer full of 'em that I'll sell cheap.> --> Old Crow> '82 Shovelhead FLTC 92" 'Pearl'> '95 Jeep Wrangler YJ> TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2
		Add comment


Matt Macchiarolo 19 March 2005 00:19:38 [ permanent link ]
	The For '95, YJ Wrangler has the vac disconnect, the XJ Cherokee doesn't. "Old Crow" <walliscrow@yahoo.com> wrote in message news:ival31p7u6ctfludrbns5nvb1f79kdl9uc@4ax.com...> On Thu, 17 Mar 2005 22:08:04 -0500, Mike Romain <romainm@sympatico.ca>> wrote:> The 95 is a full time axle isn't it?>> Mike> Nope, the '95's got the vac disconnect. So does the '94. Other> years, I cannot say, but those two are parked in the driveway.> Does anyone know if the vac switch on the t/case is the same one that> GM uses in the S-10's?> If so, I've got a whole drawer full of 'em that I'll sell cheap.> --> Old Crow> '82 Shovelhead FLTC 92" 'Pearl'> '95 Jeep Wrangler YJ> TOMKAT, BS#133, SENS, MAMBM, DOF#51, SPUNGER#2
		Add comment


Brian 21 March 2005 10:04:31 [ permanent link ]
	Quadratec has a manual disconnect under Posi Lok brand name. Bypasses the entire vacuum system. (Cable actuated). Or if your web savy you can find instruction on making your own. -Brian '91 YJ 4.0 "big95yj" <shewy14@yahoo.com> wrote in message news:1111024789.775472.116680@l41g2000cwc.googlegroups.com...>I have a '95 Jeep YJ and I too cannot shift into 4wd. I vacuum tested> the shift motor and it seems to hold the vacuum. I changed the gear oil> in it today and cleaned the shift motor, still nothing. Then i read> about the vaccuum switch on the transfer case being the possible> culprit and I immediately pulled the switch. The check valve ball> moves, but it is very stiff and slow to return. Does anybody know how> this swith is supposed the react? Also, it does seem that my Jeep> stopped going into 4wd when it got cold outside, but there has not been> warm enough weather yet to test that theory here. Thanks for the help.>
		Add comment

CarGuru > Jeep Willys > YJ Transfercase vacuum switch 21 March 2005 10:04:31

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YJ Transfercase vacuum switch

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