Engaging 4hi low questions

Stock FSJ Tech Area
Post Reply

Topic author
Eric78chief
Posts: 4
Joined: Thu May 02, 2019 7:46 pm

Engaging 4hi low questions

Post by Eric78chief » Thu May 02, 2019 7:53 pm

New to the board. Have a 78 Cherokee chief wide-track with the part time conversion Quadra Tran installed. I’m having issues with sequence of using 4x.

Basically I turn it on in park flip the e-drive to on. It works. I then try to go into low and it grinds gears and I have to turn the truck off to stop everything and put it into either low or drive. Stupid question but should I be able to put the car in low while moving or do I go into park to switch.

Thanks for the help!
Eric

User avatar

Cecil14
Posts: 691
Joined: Mon Oct 01, 2012 6:40 am

Re: Engaging 4hi low questions

Post by Cecil14 » Thu May 02, 2019 8:10 pm

Low is never (to my knowledge) synchronized. In every 4wd vehicle I've ever driven, you have to come to an almost complete, if not totally complete, stop to engage low range. I don't know if park is required in the Q/T rigs or not, but a dead stop likely is at very least.
1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank


Topic author
Eric78chief
Posts: 4
Joined: Thu May 02, 2019 7:46 pm

Re: Engaging 4hi low questions

Post by Eric78chief » Thu May 02, 2019 8:13 pm

Thanks for the reply, if I stop do I leave it in drive or pop the transmission into neutral then switch? And when I try to go back to hi it leaves me between gears and grinds anyway I try to move the transfer case lever.

Sorry I’ve worked hard going through every system and I’m now working the 4x and trouble shooting/ not trying to break something on accident.

User avatar

Cecil14
Posts: 691
Joined: Mon Oct 01, 2012 6:40 am

Re: Engaging 4hi low questions

Post by Cecil14 » Thu May 02, 2019 8:20 pm

I haven't owned a Q/T rig, so I can't comment on the specifics. Check out the manuals here:

http://oljeep.com/edge_parts_man.html

There's a 1977 owners manual (should be the same as 1978 for this purpose), that should give you the official shifting procedure. There's also a 1978 TSM, which will give you all the technical details.
1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank


Topic author
Eric78chief
Posts: 4
Joined: Thu May 02, 2019 7:46 pm

Re: Engaging 4hi low questions

Post by Eric78chief » Thu May 02, 2019 8:33 pm

Thank you!


Topic author
Eric78chief
Posts: 4
Joined: Thu May 02, 2019 7:46 pm

Re: Engaging 4hi low questions

Post by Eric78chief » Thu May 02, 2019 8:55 pm

Ok found it. Slip into neutral coasting while you move into 4lo. Last question. I have locking hubs on the front and the mile market part time conversion. Am I I. 4weel high as soon as I lock the Huns or do I need to flip the glove compartment switch to emergency drive as well?

User avatar

Cecil14
Posts: 691
Joined: Mon Oct 01, 2012 6:40 am

Re: Engaging 4hi low questions

Post by Cecil14 » Thu May 02, 2019 9:22 pm

You will definitely need to have the hubs locked, but I believe you will be in 2wd until you hit the e-drive switch. I would prefer someone more familiar with the Q/Ts jump in with confirmation, though. It's easy enough to check: with the hubs unlocked and the e-drive switch off, try to spin the front driveshaft by hand. Now try it with the hubs still unlocked, but e-drive on. That should tell you which is which.
1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank

User avatar

tgreese
Posts: 3552
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Engaging 4hi low questions

Post by tgreese » Fri May 03, 2019 5:09 am

This is what I recall...

With a part-time kit, your e-drive switch now controls the change from 2WD to 4WD and back. The hubs must be locked to go into 4WD. Unlike a conventional transfer case the part-time Quadratrac does not support shift-on-the-fly between 2WD and 4WD. Come to a full stop in park, hubs locked, and shift. Same procedure as your owner's manual describes for shifting into or out of e-drive, with the addition of the hubs.

To the interested, the part-time Quadratrac shifts just like a Dana 20, except it does not have gears that mesh to give you shift-on-the fly between 2WD and 4WD. Instead it has a lock pin that enables e-drive, and it's not designed to engage while moving.

The low range is a separate planetary transmission on the back of the transfer case, and it does not care if you are in 2WD or 4WD. You cannot change range while moving under power. AFAIK no 4WD system exists that allows shifting range while moving - don't try. If the owners manual suggests any movement, they mean moving at the barest baby crawl, just enough to help the gears to mesh. No power, barely moving - try it standing still first. Again, follow the instructions in the owner's manual.

Don't want to sound too authoritative here ... this is what I recall from my days with these cars, 40ish years ago. The main thing is the part-time kit kludges up the Quadratrac so it sort-of works like a part-time case. There are differences, and you have to think about what you are doing when you operate it. Any gear grinding is wrong ... at most I would expect a muted clunk when it moves into gear.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green

User avatar

fulsizjeep
Moderator
Posts: 4422
Joined: Sun Nov 06, 2011 7:21 am
Location: Mancos Valley, CO
Contact:

Re: Engaging 4hi low questions

Post by fulsizjeep » Fri May 03, 2019 8:02 am

I bet there is some wear inside the low range. Remember, all the power to move the Jeep goes through the low range unit first. Switching from Lo to Hi or Hi to Lo works best if you are barely moving regardless of stock or part time configuration. I put a NOS low range on my wife's Waggy a few years ago. It shifts better than any I have tried but still have to kill the engine once in a while to finish the shift. Before I put in the NOS lo range, we always had to shut off engine to complete the shift with the two previously used low range units.

"To the interested, the part-time Quadratrac shifts just like a Dana 20, except it does not have gears that mesh to give you shift-on-the fly between 2WD and 4WD. Instead it has a lock pin that enables e-drive, and it's not designed to engage while moving." I am not aware of this lock pin. You can throw the vacuum switch any time but that is not recommended. Sometimes you need to roll just a little for the Edrive/2wd-4wd shift to complete and have the indicator light go on or off. The shift fork has nylon pads on it. If these are worn or broken, that can play hell on shifting.

QT info also found here:
http://jubileejeeps.org/quadratrac
Sent from my IBM 5150 using TN5250 emulation.

Flint Boardman ~ http://jubileejeeps.org
Embracing the Borg Warner QuadraTrac since 1980 http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s, a few Evil Twin mods, http://eviltwinfab.com and a few TT's Fabworks mods, http://www.ttsfabworks.com
76 401 Wag, 77 401 Wag, 77 401 J20


will e
Posts: 3762
Joined: Sat Aug 18, 2012 8:21 am

Re: Engaging 4hi low questions

Post by will e » Fri May 03, 2019 10:34 am

I never owned an original Quadra Trac but I have had transfer cases that work best if the jeep is moving slowly and in neutral. I generally try shifting in/out while on a hill. I stop the truck, put it in neutral, take my foot off the brake and as I start to roll forward I shift the transfer case.

I do this because sometimes it wouldn't shift or would stop in neutral. Being on the hill allows me to stop the Jeep and try again.

If you find yourself 'not moving' and in Neutral in both the transfer case and transmission and the TC won't shift do NOT put the transmission into park. You will get that nasty grinding sound. In these situations I will turn the engine off, then put the transmission in Park and try the shift again.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge


letank
Posts: 2692
Joined: Wed Oct 03, 2012 9:16 pm
Location: SF bay area

Re: Engaging 4hi low questions

Post by letank » Fri May 03, 2019 11:54 am

for the QT converted or not, NO shift on the fly, preferably on level ground (1), engine in neutral for maximum manifold vacuum to give the maximum boost to the vacuum activated shifter.
When my Low range cable started to rust a bit, I would stop on flat ground, put in neutral and crawl with an open end wrench to activate the lever... wheel choke are recommended...

If you have part time conversion you can use the low range in 2WD

(1) on the first Ouray trip I was unable to shift to low range on an uphill, and had to roll back to level ground.
Michel
74 wag (349 Kmiles... parked, next step is a rust free body)
85 Gwag (226 Kmiles... the running test lab)
See Engine bits and Fuel and brake lines, and Body work


Cheap Hobby
Posts: 649
Joined: Tue Apr 22, 2014 12:53 pm
Location: Central Valley

Re: Engaging 4hi low questions

Post by Cheap Hobby » Fri May 03, 2019 10:03 pm

With the part time kit installed the vacuum control works opposite of stock, there may be a sticker over the original factory sign. I will try to find the sticker and what is left of my glove box tonight and get a picture up.
For the low range that is a separate gear driven unit attached to the case. The easiest and less damage way is to put trans in park with every thing stopped and shift to low range. You will want your foot on the brake, hard like you don't want to go off a cliff hard, you will be putting the transfer case in to neutral as you shift. You can also do trans in neutral but any motion in trans will cause grinding and binding.
79 Cherokee WT QT Golden Eagle white with gold windows "Pigger" only blows hubs the night before a road trip or the clodest night of year. Has only been towed cause of stupid.

Post Reply

Who is online

Users browsing this forum: No registered users and 12 guests