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YJ 4WD Problems
I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a
hill. Just a normal hill plenty of other SUV's pass me. Took me a long time to finally get it up the hill. I was upset to say the least. Anyway when slipping the rear end would get sideways (as if in 2wd) and a knocking sound would start that sounds like it's from the front end or maybe directly underneath me. It sounds similar to not fully engaging the 4WD if anyone has done that in their YJ. Anyone have any ideas? Transfer case? Shift linkage? or what. Any input would be appreciated.... -Brian |
Re: YJ 4WD Problems
Most likely the vacuum actuator that locks the front axle... common YJ
problem. Could be as simple as a vacuum hose. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift "Brian" wrote in message ... >I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on >a hill. Just a normal hill plenty of other SUV's pass me. Took me a long >time to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or > maybe directly underneath me. It sounds similar to not fully engaging the > 4WD if anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian > |
Re: YJ 4WD Problems
Most likely the vacuum actuator that locks the front axle... common YJ
problem. Could be as simple as a vacuum hose. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift "Brian" wrote in message ... >I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on >a hill. Just a normal hill plenty of other SUV's pass me. Took me a long >time to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or > maybe directly underneath me. It sounds similar to not fully engaging the > 4WD if anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian > |
Re: YJ 4WD Problems
Most likely the vacuum actuator that locks the front axle... common YJ
problem. Could be as simple as a vacuum hose. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift "Brian" wrote in message ... >I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on >a hill. Just a normal hill plenty of other SUV's pass me. Took me a long >time to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or > maybe directly underneath me. It sounds similar to not fully engaging the > 4WD if anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian > |
Re: YJ 4WD Problems
Your front axle connects via a vacuum switch. Maybe you have a shaky
connection there not letting it lock in? You can tell by jacking up one front tire and spinning the wheel. If the driveshaft turns, the front is locked in. If the driveshaft doesn't turn, you have issues there. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Brian wrote: > > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
Re: YJ 4WD Problems
Your front axle connects via a vacuum switch. Maybe you have a shaky
connection there not letting it lock in? You can tell by jacking up one front tire and spinning the wheel. If the driveshaft turns, the front is locked in. If the driveshaft doesn't turn, you have issues there. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Brian wrote: > > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
Re: YJ 4WD Problems
Your front axle connects via a vacuum switch. Maybe you have a shaky
connection there not letting it lock in? You can tell by jacking up one front tire and spinning the wheel. If the driveshaft turns, the front is locked in. If the driveshaft doesn't turn, you have issues there. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Brian wrote: > > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
Re: YJ 4WD Problems
If it's not a maladjusted linkage or something busted in the tcase, it
is probably a failure in the vacuum system that connects/disconnects the passenger side outer axle. There are some vacuum hoses running from the tcase to a diaphragm on the right side of the front axle housing. If any of these line are cracked/plugged, the shift fork won't push the collar on the outer axle onto the splines of the inner, and even though your front shaft is turning, your front wheels won't. You can easily confirm that this is the problem by removing the hoses at the axle and pulling off the little rectangular aluminum shift fork cover. Cut a bolt to lay along the shift fork shaft and strap it to the shaft so that the fork is jammed hard over to the left. Then move the collar to the left so it covers the splines on both the inner and outer axles and replace the cover, ensuring that the fork is laid in the groove on the collar. You can leave it locked in like this indefinitely at the expense of slight increase in noise and fuel consumption with the front shaft passively turning in 2wd (just like the newer Jeeps do by default). The easiest solution may be to replace a broken hose, but the best cure for the problematic vacuum disconnect is a shift cable operated manually from the cab. Keeps the front freewheeling in 2-high and gives the option of 2-low. You can buy a kit for a few hundred or make your own for next to nothing. Here are some pics of my cable setup that show the fork & collar: http://xjeep.dyndns.org/posilok Steve http://xjeep.dyndns.org Brian wrote: > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
Re: YJ 4WD Problems
If it's not a maladjusted linkage or something busted in the tcase, it
is probably a failure in the vacuum system that connects/disconnects the passenger side outer axle. There are some vacuum hoses running from the tcase to a diaphragm on the right side of the front axle housing. If any of these line are cracked/plugged, the shift fork won't push the collar on the outer axle onto the splines of the inner, and even though your front shaft is turning, your front wheels won't. You can easily confirm that this is the problem by removing the hoses at the axle and pulling off the little rectangular aluminum shift fork cover. Cut a bolt to lay along the shift fork shaft and strap it to the shaft so that the fork is jammed hard over to the left. Then move the collar to the left so it covers the splines on both the inner and outer axles and replace the cover, ensuring that the fork is laid in the groove on the collar. You can leave it locked in like this indefinitely at the expense of slight increase in noise and fuel consumption with the front shaft passively turning in 2wd (just like the newer Jeeps do by default). The easiest solution may be to replace a broken hose, but the best cure for the problematic vacuum disconnect is a shift cable operated manually from the cab. Keeps the front freewheeling in 2-high and gives the option of 2-low. You can buy a kit for a few hundred or make your own for next to nothing. Here are some pics of my cable setup that show the fork & collar: http://xjeep.dyndns.org/posilok Steve http://xjeep.dyndns.org Brian wrote: > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
Re: YJ 4WD Problems
If it's not a maladjusted linkage or something busted in the tcase, it
is probably a failure in the vacuum system that connects/disconnects the passenger side outer axle. There are some vacuum hoses running from the tcase to a diaphragm on the right side of the front axle housing. If any of these line are cracked/plugged, the shift fork won't push the collar on the outer axle onto the splines of the inner, and even though your front shaft is turning, your front wheels won't. You can easily confirm that this is the problem by removing the hoses at the axle and pulling off the little rectangular aluminum shift fork cover. Cut a bolt to lay along the shift fork shaft and strap it to the shaft so that the fork is jammed hard over to the left. Then move the collar to the left so it covers the splines on both the inner and outer axles and replace the cover, ensuring that the fork is laid in the groove on the collar. You can leave it locked in like this indefinitely at the expense of slight increase in noise and fuel consumption with the front shaft passively turning in 2wd (just like the newer Jeeps do by default). The easiest solution may be to replace a broken hose, but the best cure for the problematic vacuum disconnect is a shift cable operated manually from the cab. Keeps the front freewheeling in 2-high and gives the option of 2-low. You can buy a kit for a few hundred or make your own for next to nothing. Here are some pics of my cable setup that show the fork & collar: http://xjeep.dyndns.org/posilok Steve http://xjeep.dyndns.org Brian wrote: > I have a 91 YJ w/ 4.0 5speed manual. During the recent snow I got stuck on a > hill. Just a normal hill plenty of other SUV's pass me. Took me a long time > to finally get it up the hill. I was upset to say the least. > > Anyway when slipping the rear end would get sideways (as if in 2wd) and a > knocking sound would start that sounds like it's from the front end or maybe > directly underneath me. It sounds similar to not fully engaging the 4WD if > anyone has done that in their YJ. > > Anyone have any ideas? Transfer case? Shift linkage? or what. Any input > would be appreciated.... > > -Brian |
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