10-04-2011, 05:17 PM
|
#1
|
Member
|
|
Join Date: Jan 2011
Posts: 56
|
|
Member
Join Date: Jan 2011
Posts: 56
|
Chain Drive in Transfer Case
Simple question. Does it turn all the time or just when the 4 wheel drive is engaged? Or, when its put into low 4wheel drive?
|
|
Reply With Quote
|
10-05-2011, 05:55 PM
|
#2
|
Member
|
|
Join Date: Jan 2011
Posts: 56
|
|
Member
Join Date: Jan 2011
Posts: 56
|
Surely someone out there can answer this.
Surely someone out there can answer this.
|
|
Reply With Quote
|
10-05-2011, 07:32 PM
|
#3
|
Senior Member
|
|
Join Date: Jan 2010
Location: Central FL
Posts: 1,325
|
|
Senior Member
Join Date: Jan 2010
Location: Central FL
Posts: 1,325
|
Quote:
Originally Posted by Sandpiper
Simple question. Does it turn all the time or just when the 4 wheel drive is engaged? Or, when its put into low 4wheel drive?
|
Somebody said that the manual suggests we put it in 4wd once a month for about 10 miles, that would lead me to believe that the gears in the transfer case do not move unless 4wd is engaged. The 10 miles per month is apparently for the purpose of proper lubrication of the gears, seals etc. Is there really a Chain in there?
__________________
2010 Salsa Red SR5, Black Power Leather Seats, Sliding Rear Cargo Deck, Luggage Rack Cross Bars, Black Pin Stripes, Black Body Side Moldings, Front and Rear 120v outlets, Husky Floor and Cargo Mats, Wade Window Vents, Autovent Shade Bug deflector II, Modified Trailer Electrical Connection, Rear View Camera, Michelin LTX M/S2 285/70/17, Load Range D, OEM Hood Insulator. Blacked out front emblem, front, rear and side chrome strips, Blacked out and modified rear emblem, luggage rack and black OEM door handles.
|
|
Reply With Quote
|
10-05-2011, 08:40 PM
|
#4
|
Member
|
|
Join Date: Apr 2010
Location: Elbert County, Colorado
Posts: 193
|
|
Member
Join Date: Apr 2010
Location: Elbert County, Colorado
Posts: 193
|
Quote:
Originally Posted by Jtraskell
. . . Is there really a Chain in there?
|
Sure is — in both versions.
__________________
★☆★
2010 Trail Edition with KDSS
DuraTrac 265/70R17E • PIAA 60XT Driving Lamps • Wolo Horns • Fogs-Enabled-With High Beams • Fumoto Valve
|
|
Reply With Quote
|
10-05-2011, 09:04 PM
|
#5
|
Senior Member
|
|
Join Date: Jan 2010
Location: Central FL
Posts: 1,325
|
|
Senior Member
Join Date: Jan 2010
Location: Central FL
Posts: 1,325
|
Quote:
Originally Posted by Froggy
Sure is — in both versions.
|
Love this forum. Learn something new everyday! Thanks Froggy. I always though it was just "toothed" gears similar to the rear and front end diff. Never saw a transfer case opened up, just assumed! Thanks again. Be safe.
__________________
2010 Salsa Red SR5, Black Power Leather Seats, Sliding Rear Cargo Deck, Luggage Rack Cross Bars, Black Pin Stripes, Black Body Side Moldings, Front and Rear 120v outlets, Husky Floor and Cargo Mats, Wade Window Vents, Autovent Shade Bug deflector II, Modified Trailer Electrical Connection, Rear View Camera, Michelin LTX M/S2 285/70/17, Load Range D, OEM Hood Insulator. Blacked out front emblem, front, rear and side chrome strips, Blacked out and modified rear emblem, luggage rack and black OEM door handles.
|
|
Reply With Quote
|
10-05-2011, 11:29 PM
|
#6
|
Member
|
|
Join Date: Aug 2010
Location: Florida
Posts: 152
|
|
Member
Join Date: Aug 2010
Location: Florida
Posts: 152
|
OK...I'll try to answer all questions...If I miss one, let me know.
Yes, the transfer case is chain driven. Most modern light/medium duty tranfer cases are (I believe all major 4WD brands in the US are). You have to go back to 1970's vintage vehicles like the old matchbox Ford Broncos (which had an NP205...or NP204...can't remember the number), International Scouts, certain Jeeps, and some early Toyota Landcruisers and Nissan Commandos to find "Gear Driven" transfer cases (SUVs...There are a lot of older trucks from the same time period that have gear driven cases, like Fords through 1979).
The transfer case in the SR5 4 runner does not turn when in 2wd (speaking for the SR5, part time 4wd here...not the Limited with the full time 4wd). I'm not sure if the case rotates in the Limited and Trail in normal driving...If it is like my old Expedition, it only engages when it detects rear wheel spin.
All above information is from my feable memory...so...someone might correct me (which is appreciated). I haven't visited these topics in a while.
By the way...There's nothing wrong with having chain driven transfer case. Take care of them...and they will last indefinately. It's not a bycicle chain...it is much more robust than that. Abuse them...and they will crater like anything else. But, the Toyota transfer case can take on a lot of challenges.
It's good practice to "excercise" your 4wd system. I don't hit the 10 mile a month goal. But, I do get 3 or 4 in driving back and forth to the river each month.
__________________
2010 T4R SR5 4X4. Firestone Destination ATs. Thule Aero Cross Bars. Recovering Nissan Titan Owner.
Epic quote: "There is nothing like a good mid-life crisis to bring clarity and focus to bad decisions." (author...me)
|
|
Reply With Quote
|
10-06-2011, 02:03 AM
|
#7
|
|
Senior Member
|
|
Join Date: Dec 2004
Location: So. Nevada
Posts: 3,161
|
|
Senior Member
Join Date: Dec 2004
Location: So. Nevada
Posts: 3,161
|
Quote:
Originally Posted by Fuzzylogic
I'm not sure if the case rotates in the Limited and Trail in normal driving.
|
It does in the Limited, for sure, as it's full-time 4WD.
__________________
2005 Limited V8
Bilstein 5100 at .85
5th gen SR5 springs
BFG AT KO2 LT265/70/17 Load C (Replaced Revo 2 LT265/70/17 Load E)
Hanna sliders
|
|
Reply With Quote
|
10-06-2011, 08:39 AM
|
#8
|
Member
|
|
Join Date: Jan 2011
Posts: 56
|
|
Member
Join Date: Jan 2011
Posts: 56
|
Gearcase
Thanks for the answer. I had heard nearly all light four wheel drives use the chain system because it is so much quieter than gear on gear. I could not imagine it turning all the time but then some engines use a timing chain that runs all the time. As sort of a gear head I still don't understand why they suggest running the four wheel drive once a month or so. Its not like it will rust or something but then it might just keep the linkage freed up.
|
|
Reply With Quote
|
10-06-2011, 09:16 AM
|
#9
|
Junior Member
|
|
Join Date: Sep 2011
Posts: 2
|
|
Junior Member
Join Date: Sep 2011
Posts: 2
|
What does it mean by the t-case is being "locked" when you switch the Limited into 4H or 4L? Its engaging something that normally isn't. But I guess you're right that something has to be moving in there with AWD.
|
|
Reply With Quote
|
10-06-2011, 10:10 AM
|
#10
|
|
Member
|
|
Join Date: Jan 2011
Location: Northern VA
Posts: 763
|
|
Member
Join Date: Jan 2011
Location: Northern VA
Posts: 763
|
Quote:
Originally Posted by Sandpiper
Thanks for the answer. I had heard nearly all light four wheel drives use the chain system because it is so much quieter than gear on gear. I could not imagine it turning all the time but then some engines use a timing chain that runs all the time. As sort of a gear head I still don't understand why they suggest running the four wheel drive once a month or so. Its not like it will rust or something but then it might just keep the linkage freed up.
|
The front differential and the front drive shaft u joints don't turn when the system is in 2WD. The front diff is about 1/3 of the way full, exposing the top of the gears, bearings, and so on. Leave them in place a few weeks, any lubricant with its corrosion inhibitors will eventually run off those components. They are then exposed (potentially) to corrosion.
There is an electric actuator that effectively locks the front hubs on the front diff, and this also needs to be moved.
Quote:
Originally Posted by dpdsurf
What does it mean by the t-case is being "locked" when you switch the Limited into 4H or 4L? Its engaging something that normally isn't. But I guess you're right that something has to be moving in there with AWD.
|
It locks the torsen differential in the transfer case to lock 4H, which has the same effect as engaging 4H in the part time system.
There is the other reason to use a chain the transfer case - it's the weakest link, and when you overstress the 4WD linkage by, say engaging 4H on a dry road and doing a bunch of turns, the chain will fail. Ostensibly the system is designed correctly and will leave you with RWD only when this happens. On gear-driven transfer cases, the actual transfer case housing will fail, and you'll lose all drive, and get to call a tow truck.
__________________
'13 Spruce Mica Tundra CM 5.7L Trd, EXP1 front bumper, Transforce AT LT275/70R18s, White Knuckle Sliders, Leer 100XL cap w. Wilderness Package, Line-X.
Sorry, I can't help but think less of you when you won't take the time to spell things right or use proper grammar. Deal with it. I don't care if you're ESL either, because I am too.
|
|
Reply With Quote
|
10-06-2011, 11:30 AM
|
#11
|
|
Junior Member
|
|
Join Date: May 2011
Location: Hamilton Ont Canada
Posts: 28
|
|
Junior Member
Join Date: May 2011
Location: Hamilton Ont Canada
Posts: 28
|
Quote:
Originally Posted by homeyclaus
There is the other reason to use a chain the transfer case - it's the weakest link, and when you overstress the 4WD linkage by, say engaging 4H on a dry road and doing a bunch of turns, the chain will fail. Ostensibly the system is designed correctly and will leave you with RWD only when this happens. On gear-driven transfer cases, the actual transfer case housing will fail, and you'll lose all drive, and get to call a tow truck.
|
Shouldn't the u-joints in the system be the weakest links as they are the easiest and cheapest components to replace?
__________________
2010 4Runner Limited, no mods.
87YJ on 38's, all kinds of mods, all kinds of problems!!
|
|
Reply With Quote
|
10-06-2011, 12:13 PM
|
#12
|
|
Member
|
|
Join Date: Jan 2011
Location: Northern VA
Posts: 763
|
|
Member
Join Date: Jan 2011
Location: Northern VA
Posts: 763
|
Quote:
Originally Posted by Slag
Shouldn't the u-joints in the system be the weakest links as they are the easiest and cheapest components to replace?
|
In a perfect world, yes. The reality of u-joints is that they're subject to non-linear stresses, at varying angles - the drive shaft turns, and the drive shaft articulates as the suspension compresses and decompresses. It's really, really hard to make a part that'll sacrifice itself, at the right time, to protect other parts under those circumstances.
__________________
'13 Spruce Mica Tundra CM 5.7L Trd, EXP1 front bumper, Transforce AT LT275/70R18s, White Knuckle Sliders, Leer 100XL cap w. Wilderness Package, Line-X.
Sorry, I can't help but think less of you when you won't take the time to spell things right or use proper grammar. Deal with it. I don't care if you're ESL either, because I am too.
|
|
Reply With Quote
|
10-06-2011, 01:16 PM
|
#13
|
Senior Member
|
|
Join Date: Mar 2006
Location: Near Framingham, MA
Posts: 2,670
|
|
Senior Member
Join Date: Mar 2006
Location: Near Framingham, MA
Posts: 2,670
|
Quote:
Originally Posted by dpdsurf
What does it mean by the t-case is being "locked" when you switch the Limited into 4H or 4L? Its engaging something that normally isn't. But I guess you're right that something has to be moving in there with AWD.
|
When you lock the center diff in the Limited, that causes the front and rear differentials to turn at the same speed, thus behaving just like a part-time 4WD system in 4WD.
__________________
If brute force doesn't work, you're not using enough of it.
Current: 2013 Land Cruiser
Gone: 2003 4Runner V8 Limited 4WD
|
|
Reply With Quote
|
04-13-2024, 11:34 PM
|
#14
|
Junior Member
|
|
Join Date: Apr 2024
Location: Florida
Posts: 1
|
|
Junior Member
Join Date: Apr 2024
Location: Florida
Posts: 1
|
relaxing stretched chain
Sorry, I'm new and can't make a new post. I have a 2012 limited with the full time 4wd transfer case. Looks like the fluid got low as I had to put about 400ml in to top it off. Apparently that caused pretty excessive wear on the chain. I can move it quite large amount with a screwdriver through the fill hole. I think it's so bad it's jumping teeth. Apparently this is pretty rare as several searches turned up nothing. Rock Auto doesn't even carry the parts. Has anyone done this? I've done it on an old XJ Cherokee (NP231), but I'm sure this one is significantly more complicated. Any tips would be appreciated.
|
|
Reply With Quote
|
04-14-2024, 10:07 AM
|
#15
|
Senior Member
|
|
Join Date: Sep 2020
Location: Utah
Posts: 1,342
|
|
Senior Member
Join Date: Sep 2020
Location: Utah
Posts: 1,342
|
Quote:
Originally Posted by jworth
Sorry, I'm new and can't make a new post. I have a 2012 limited with the full time 4wd transfer case. Looks like the fluid got low as I had to put about 400ml in to top it off. Apparently that caused pretty excessive wear on the chain. I can move it quite large amount with a screwdriver through the fill hole. I think it's so bad it's jumping teeth. Apparently this is pretty rare as several searches turned up nothing. Rock Auto doesn't even carry the parts. Has anyone done this? I've done it on an old XJ Cherokee (NP231), but I'm sure this one is significantly more complicated. Any tips would be appreciated.
|
Suggest you start with the repair manual. It shows how to do most repairs. Even though this version is different years, not that much has changed throughout the 5th generation production:
TOYOTA 2016-2019 4Runner Repair Manual RM27F0U
|
|
Reply With Quote
|
Thread Tools |
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|