4th Gear for towing?

Submitted: Sunday, Nov 07, 2004 at 22:32
ThreadID: 17624 Views:3335 Replies:9 FollowUps:8
This Thread has been Archived
Hi,
I have been told I should be towing my cavalier camper behind my 85 landcruiser sahara in 4th gear rather than 5th on the highway. Can anyone tell me:
1 Is this true?
2. Why?

Chappo
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Reply By: Truckster (Vic) - Sunday, Nov 07, 2004 at 22:37

Sunday, Nov 07, 2004 at 22:37
Have a search of the archives, has been asked before numerous times.
AnswerID: 83424

Follow Up By: chappobriz - Sunday, Nov 07, 2004 at 22:37

Sunday, Nov 07, 2004 at 22:37
thanks
chappo
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FollowupID: 342420

Follow Up By: chappobriz - Sunday, Nov 07, 2004 at 22:52

Sunday, Nov 07, 2004 at 22:52
Can you tell me where in the archives????
chappo
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FollowupID: 342428

Reply By: Utemad - Sunday, Nov 07, 2004 at 22:54

Sunday, Nov 07, 2004 at 22:54
Have a read of all these archived posts

You will see the pros and cons of 5th gear towing from those that have been there.
AnswerID: 83431

Follow Up By: Utemad - Sunday, Nov 07, 2004 at 23:09

Sunday, Nov 07, 2004 at 23:09
Hmmmmmmm that didn't work.

8201

8236

7354

4406

Found these by searching for "towing 5th" in the archives.

Happy reading.
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FollowupID: 342430

Follow Up By: Utemad - Monday, Nov 08, 2004 at 08:25

Monday, Nov 08, 2004 at 08:25
Try asking a Gearbox Rebuild place that has done some Landcruiser boxes of your type. They shouuld be able to give you the definitive answer.
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FollowupID: 342444

Reply By: Bobvic - Sunday, Nov 07, 2004 at 23:54

Sunday, Nov 07, 2004 at 23:54
Chappo,
The two things you need to remember are:
Don't over rev your engine
Don't let your engine labour - and as a guide I'd change down from 5th anywhere below 2,000rpm but if you tune into your vehicle you'll know when your engine is doing it easily and when it's starting to labour.
I've always used 5th gear when possible. Even towing a 17 foot pop top van with a 4 cylinder Pajero back in the early 90s! That vehicle did 335,000km with me and had no gearbox problems. I towed the van for many thousands of kms.
AnswerID: 83443

Reply By: fisho64 - Monday, Nov 08, 2004 at 02:38

Monday, Nov 08, 2004 at 02:38
The reason is that in your box (manual) there are two main shafts. One is a layshaft which has all the gearsets on it other than 4th which is direct drive (1 to 1 ) and therefore in 4th gear the power goes in one end of the box and straight thru the main shaft and to the transfer case. Any other gear drives via the layshaft. On some vehicles with weak boxes this can be the case of whether your box lives another day or not after a heavy tow.
AnswerID: 83448

Follow Up By: Rosco - Bris. - Monday, Nov 08, 2004 at 09:07

Monday, Nov 08, 2004 at 09:07
Fish

A good explanation of how a gear box works. Made me recall a thought I had some time ago.

Is there any obvious reason why manufacturers couldn't change the diff ratio to make 5th the straight through gear with 1-4 on the layshaft ?

Just wondering.

Cheers
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FollowupID: 342449

Follow Up By: Rosco - Bris. - Monday, Nov 08, 2004 at 09:09

Monday, Nov 08, 2004 at 09:09
PS

Just thought about it a tad more. I suppose engine revs would have to increase across the board to achieve this .. correct?
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FollowupID: 342450

Follow Up By: Flash - Monday, Nov 08, 2004 at 09:19

Monday, Nov 08, 2004 at 09:19
Rosco -Nup,
you'd just need a higher diff ratio AND a lower 1st 2nd etc gear ratio to compensate.
IF gearboxes are designed properly 5th gear should be fine. Obviously some are "underdesigned".
Cheers
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FollowupID: 342455

Reply By: Member - Brian (WA) - Monday, Nov 08, 2004 at 11:30

Monday, Nov 08, 2004 at 11:30
Hi all
not having known about towing in 5th gear. I have been useing it towing my
camper.the 4by is 2,1/2 years old. would you say that i have started to damage it.
at the moment it seems ok.also I tend to use it a lot around town,is that wrong
Also if 5th goes out bush can you still drive home useing the other gears.Or will
it go gradually.
any positive coments will help.
cheers brian
AnswerID: 83480

Follow Up By: Jim-Bob - Monday, Nov 08, 2004 at 19:57

Monday, Nov 08, 2004 at 19:57
G'day Brian
If by chance you do break 5th gear you can generally drive them home.
Check your cars handbook on towing and it should tell you if you can or cannot use 5th gear for towing.
A lot of these stories come from some gearbox reconditioners because they use inferior spare parts.
I own a 89 model 2.8D 4 runner and have towed my ct up the cape and half way round Aust. without a problem, 490,000kms on car, untill last year when the front oil seal started leaking.
So strapped for time I got Newcastle Gearbox & Diff to rebearing the box for me, oh what a mistake that was.
1st time back under warranty, oil leaks, 1000kms.
2nd time back, smashed 5th gear roller bearing, 2000kms. Replaced original 5th gear with their cheap crap parts.
3rd time back, smashed 5th gear, told then I shouldn't tow in 5th gear.
No where in the cars hand book does it say not to tow in 5th gear, I think Toyota know a bit more than these clowns.
When I got back from my last trip I decided to buy a Pray Do 3.0l T.D. and nowhere in it's hand book does it say no towing in 5th because you'll break 5th gear. I think it says you can tow 2500kgs with a payload of 600kgs from memory.
As long as you keep your speed up and don't induce gear chatter you should be fine.
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FollowupID: 342502

Reply By: Member - Ross P (NSW) - Monday, Nov 08, 2004 at 14:18

Monday, Nov 08, 2004 at 14:18
Here's a another way of looking at it. On recent trip towing a dirt road pop top I ran into problems with over heating (the reason is another story). I was able to travel many, many kilometres by locking the car in 4th gear (auto with tptronc box). Whenever in 5th on long stretches even wth slght nclne the temperature guage strated to rise. Just shows that 4th gearputs less load on the system.
AnswerID: 83501

Reply By: Richard Kovac - Tuesday, Nov 09, 2004 at 00:15

Tuesday, Nov 09, 2004 at 00:15
hi chappo
i have a 2003 troopy and the owner's manual states "when towing a trailer, in order to maintain engine braking , do not use fifth gear"
under towing ( 4 pages) there is no comment of which gear to use

Regards
Richard
AnswerID: 83603

Reply By: fisho64 - Tuesday, Nov 09, 2004 at 03:54

Tuesday, Nov 09, 2004 at 03:54
ive done it with my lux, and what seemsto be the case is that the design of most 5 speeds has it supported on the lay shaft by a bearing on one end and a bearing at the other between the gear cluster and 5th gear. So 5th actually hangs out in the breeze so to speak. When it goes it sudden and snaps the layshaft where it hangs out of the bearing and it drops into the half of the box that doesnt contain the rest of the gearsets. If you look at your box you will see in the middle a plate about 1 inch thick with the 2 casings 1 each end. if you split the box bsaically that plate has all the shaft assemblies fitted to it.
note this doesnt apply to autos as far as i understand, different layout?
AnswerID: 83611

Reply By: chappobriz - Wednesday, Nov 10, 2004 at 00:22

Wednesday, Nov 10, 2004 at 00:22
Thanks to everyonefor the feedback! I now understand why! Looking forward to a good trip!

Chappo
AnswerID: 83796

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