Toyota LC 70 series gear ratios

Submitted: Monday, Aug 05, 2013 at 16:20
ThreadID: 103599 Views:5579 Replies:5 FollowUps:20
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I'm considering a current 70 series cab chassis and I note some spec's show 2400/2600 rpm in 5 gear at 100kph. Seems high given my current 200 series plods along at around 1800rpm in auto 5th gear at similar speeds
Anybody got any input ? Is there a higher 5th gear aftermarket option available?
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Reply By: fisho64 - Monday, Aug 05, 2013 at 16:37

Monday, Aug 05, 2013 at 16:37
that doesnt sound at all right. Where do you access specs showing rpm at a given speed?
AnswerID: 515953

Follow Up By: steveg0511 - Monday, Aug 05, 2013 at 16:45

Monday, Aug 05, 2013 at 16:45
It was taken from what was a very positive review article in Overlander magazine about candidates for 4wd of the year . The reviewer noted some dissatisfactions, one was this issue of 5th gear performance. What has been your experience with this vehicle?
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Follow Up By: fisho64 - Monday, Aug 05, 2013 at 17:07

Monday, Aug 05, 2013 at 17:07
I have a 200, and those sort of revs are a huge difference as mine at 100ks is doing 1600rpm which is too low.
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Follow Up By: Ross M - Monday, Aug 05, 2013 at 17:17

Monday, Aug 05, 2013 at 17:17
steveg0511
Always remember a magazine is written by a journalist and nothing they write should ever be believed without thorough checking.
If you have the gearbox ratios off a flyer etc it can be worked out if you also know the tyre size.

In your case the overdrive ratio, the diff ratio and tyre size is the three things you require.

Ross M
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Reply By: olcoolone - Monday, Aug 05, 2013 at 16:52

Monday, Aug 05, 2013 at 16:52
Difference is one's a passenger vehicle and the other is a workhorse designed to carry and tow heavy loads, the other reason it lacks 150nm and 40kw's.

The 200 series has the worst gearbox software around, show it a slight hill and it will be doing 2500-3000rpm at 100kph.

First gear in very low in the 70 series..... maybe a bigger set of hoops will make it better.
AnswerID: 515954

Follow Up By: steveg0511 - Monday, Aug 05, 2013 at 16:59

Monday, Aug 05, 2013 at 16:59
I agree with you regarding the 200 series. I don't think mine had ever held on to 6th gear. I fitted a replacement valve body and Toque converter lock-up kit from Wholesale Automatics and it made a big difference.
Do you find the 70's higher working rev,s in 5th gear an issue or am I jumping at shadows?
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Follow Up By: fisho64 - Monday, Aug 05, 2013 at 17:09

Monday, Aug 05, 2013 at 17:09
what sort of difference did it make steve?
I kind of disagree with you guys, software is probably ok but diff ratios are too low.
If instead of 1600 it was doing say 1800 in 6th at 100 or so it would be much better
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Follow Up By: steveg0511 - Monday, Aug 05, 2013 at 18:40

Monday, Aug 05, 2013 at 18:40
Hey Fisho, before the tranny mods I would do 1600 rpm @ 100k if I could get into 6th and that almost required the planets to align because it would go down to 5th or the torque converter would constantly cut in and out which almost feels like a gear change. this was particularly annoying when towing
Firstly I tried the Toyota software patch and that helped but didn't solve the issue
After the tranny mods revs went up a bit to 1700/1800 but she held 6th endlessly changing down much more sensibly. The T/C lockup stopped the converter cutting in and out. Economy improved when towing by 1-1.5 litre per 100 k's and by a bit more when unladen.
The other advantage of the L/C lockup was much improved low speed engine braking when "off road"
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Follow Up By: Ross M - Monday, Aug 05, 2013 at 20:28

Monday, Aug 05, 2013 at 20:28
steveg0511
After the transmission mods were done it must have just locked out the T/C clutch from working. No other way to be in 6th and have more revs, unless the box was pulled apart and different planetary ratios inserted..

If the T/C clutch is closed ie driving , then the revs will be the lowest in 6th not up to 1700/1800.

Torque converters don't cut in and out. it is the T/C clutch which cuts in or drops out.

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Follow Up By: fisho64 - Monday, Aug 05, 2013 at 20:54

Monday, Aug 05, 2013 at 20:54
Was going to say the same ross. A bit like the bloke a while back whose car ran at lower rpm after an exhaust swap
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Follow Up By: Ross M - Monday, Aug 05, 2013 at 21:54

Monday, Aug 05, 2013 at 21:54
fisho64
That exhaust effect must be also connected with torque converters too it seems.

I read a lot of things people have written and not sure they know what they've got when someone else modifies their vehicle.
With all the mods to lockup clutches, (The fashion ) which are small clutches in a torque converter, I often wonder how long they last when being asked to work much harder than intended by the manufacturer.

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Follow Up By: pop2jocem - Monday, Aug 05, 2013 at 22:26

Monday, Aug 05, 2013 at 22:26
Agree Ross, the lockup clutch in any auto, actually make that most autos, was designed to remove converter slip when at cruising speed, not to take full engine braking or max HP (KWs..lol).
As far as the different engine speeds between a 70 series which is a manual 5 speed work truck and a 200 series Toorak Tractor with an auto 6 speed and the two top ratios being overdrive and probably a lower numerical diff ratio I am not surprised. The 200 series was designed with a different market in mind. IMHO still a good tow vehicle for someone who knows how to manage the auto box rather than just stick it in D and let the box hunt up and down ratios and the lockup clutch getting a damn good workout.
Comfort??...no contest..lol.

Cheers
Pop
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Follow Up By: Ross M - Monday, Aug 05, 2013 at 22:45

Monday, Aug 05, 2013 at 22:45
Pop
Almost all people would be amazed if they saw a normal clutch plate and the CD sized(no music) clutchplate out of an auto torque converter.
I think they would hesitate with the switch.

The Toyota software may be in tune with the clutch plate size after all.

Maybe "D" is for Damned Good.
Why are people comparing two entirely different vehicles,as mentioned, made for different purposes.
Only common really is Toyota is the maker.
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Follow Up By: Aussi Traveller - Monday, Aug 05, 2013 at 23:51

Monday, Aug 05, 2013 at 23:51
olcoolone just using the word gearbox shows you know very little about what you are talking about, the 200 series has a 6 speed auto transmission not a 6 speed gearbox.

The 200 series is also a twin turbo were as the 70 series is a single turbo, my 200 has never come close to those revs (2500-3000rpm) at 100 kmp on any hill, and at 130 kmp the revs are at 1800 rpm.

People should research and know what they are talking about before posting on a public forum, should you ( steveg0511 ) have any questions with your Toyota then I suggest you give ( TOYOTA ) the (EXPERTS) on them a call.



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Follow Up By: fisho64 - Tuesday, Aug 06, 2013 at 02:39

Tuesday, Aug 06, 2013 at 02:39
"should you ( steveg0511 ) have any questions with your Toyota then I suggest you give ( TOYOTA ) the (EXPERTS) on them a call."

but maybe learn to speak Japanese first and ring there.
Aussie you obviously havent tried that-you'd get a blank look if you asked a technical question in Aus Toyota workshops.
Try asking to have your transmission fluid changed and see what happens
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Follow Up By: olcoolone - Tuesday, Aug 06, 2013 at 08:46

Tuesday, Aug 06, 2013 at 08:46
QUOTE"olcoolone just using the word gearbox shows you know very little about what you are talking about, the 200 series has a 6 speed auto transmission not a 6 speed gearbox."

LOL LOL ROLF...... whatever.

What a waste of space you are!

BTW, Meaning of gearbox
"a metal box that contains the gears of a vehicle, or the system of gears itself"

Have a look here and LEARN.

http://en.wikipedia.org/wiki/Transmission_(mechanics)

So the 200 series doesn't have gears in that box?
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Follow Up By: Ross M - Tuesday, Aug 06, 2013 at 09:53

Tuesday, Aug 06, 2013 at 09:53
A "transmission" can also be a radio or television transmission.

The term gearbox is used for purposes of describing something which has a gearing system in it.
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Follow Up By: olcoolone - Tuesday, Aug 06, 2013 at 10:53

Tuesday, Aug 06, 2013 at 10:53
Yeah Ross, there are many names used and they all mean the same.... yes they all have to have gears inside them to be called a "gearbox".

Last time I pulled an auto box apart they had gears in them!

The only real transmission in automotive is the CV trans, everything else is a gearbox inc diffs and even steering boxes...

Transmission can refer to the whole drive train and not just one specific component.

The only difference between a manual and automatic box is one you change gears manually and the other does it automatically, both have gears sets and are much the same.

Then you have to auto shift over manual box like the Road Rangers and the VW DSG box thats two manual gearbox in one with automatic pre selectors and automatic clutches that select two gears at once aiding in a fast shift...... so really it's an automatic manual. LOL


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Reply By: braggy - Monday, Aug 05, 2013 at 18:21

Monday, Aug 05, 2013 at 18:21
Steveg

I have a 76 series, standard tyres,3" exhaust, and chip it, 100kph 2300rpm 5th gear
That said ,towing 2.5 ton van does 14.5 l/100k

Cheers Ken
AnswerID: 515963

Follow Up By: steveg0511 - Monday, Aug 05, 2013 at 18:57

Monday, Aug 05, 2013 at 18:57
you happy with how it "feels" @ 2300rpm?
How do you find it for engine noise? and extra pull power when needed?
what was it like before the chip and 3" tubes?
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Follow Up By: braggy - Tuesday, Aug 06, 2013 at 15:03

Tuesday, Aug 06, 2013 at 15:03
Hi Steveg

Yeah I was concerned about noise at those rpms (coming from a D4 HSE), got use to it pretty quick, But I do call it the truck.

3" went on staight away, so cann't really tell
Chip it was well worth it, pulls the van much smoother in 5th.

I have no regrets, I love my truck

Cheers Ken
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Reply By: Member - Phil G (SA) - Monday, Aug 05, 2013 at 19:42

Monday, Aug 05, 2013 at 19:42
Yep, it's just waiting to be fitted with bigger tyres!
AnswerID: 515967

Reply By: AlbyNSW - Tuesday, Aug 06, 2013 at 08:41

Tuesday, Aug 06, 2013 at 08:41
I had the same concern before buying one and it is not an issue
Admittedly I am running 33 inch tyres but have not felt the need for a lower cog on the highway like I thought I would
AnswerID: 515986

Follow Up By: steveg0511 - Tuesday, Aug 06, 2013 at 09:10

Tuesday, Aug 06, 2013 at 09:10
Thanks Alby. You've given me what I was looking for,a users opinion on the on road 5th gear performance of the LC. Appreciate your input
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Follow Up By: AlbyNSW - Tuesday, Aug 06, 2013 at 09:57

Tuesday, Aug 06, 2013 at 09:57
Steve from memory I dropped 150 to 200 RPM at 100KPH changing to 33's
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