Clutch and lower gears

[patrolone]

Hi, I know similar threads have already been posted in the forum, but I can't find out what specific need. I usually use my 2.8 y60 with 34" for crawling. In about ten times I used it the cluth failed. I talked with my friends and I've been suggested first to use a stronger clutch like the exedy safari tuff, but even to change the ratio of the lower gears because it can help reducing the stress of the clutch itself. I don't know if it make necessary to change also the flying wheel. What do you think about this? Thanks!

[threedogs]

Weird , I think tyres too big for the motor M2Cw,

[macca86]

Never heard of a clutch letting go unless you ride the clutch not adjusted properly or water in the box or clutch and towing. Get a heavy duty one machine the flywheel no need to change ratios unless doing serious crawling then just do transfer case gears

[nissannewby]

Yeah sounds like the clutch may have been close to giving up anyway. Get the heavy duty clutch and if your still keen on lowering the gears then go with what macca has suggested and get some low range reduction gears. There are plenty of 2.8's that run 35's daily so I dont think the tyres are to big.

[happygu]

Patrolone,

The lower ratio gears are in the transfer case, and have nothing to do with the clutch, flywheel or gearbox.

Put a new heavy duty clutch in, and putting crawler gears in the transfer case for your low range rock hopping will do wonders for driveability and service life.

[patrolone]

Patrolone,

The lower ratio gears are in the transfer case, and have nothing to do with the clutch, flywheel or gearbox.

Put a new heavy duty clutch in, and putting crawler gears in the transfer case for your low range rock hopping will do wonders for driveability and service life.



Happygtu,
for lower ratio gears I meant ring and pinion in the diffs.

Do you think could be usefull to help the clucth working safer on hard obstacles?

[macca86]

No not at all. Driving style maintiance will help the clutch. Diff gears will make traveling slower on obstacles easier but will make highway driving hard work. Transfer case gears better option doesn't change on road habits only low range 4wd. The rd28 has the highest factory diff ratios anyway

[threedogs]

For Macca, happy and Newby have you seen where this dude takes his patrol, He really needs a set of reduction gears.
full on terrain he has posted pics somewhere

[macca86]

That's what we have suggested as it sounds like he's riding the clutch too much crawling without stalling. Probably needs the 85% reduction set from marks

[happygu]

Patrolone,

You should definitely look at the transfer case reduction gears.... http://www.marks4wd.com/mfk1515-2-86l.html

of this page showing the different ratios available... http://www.marks4wd.com/low-range-gears/nissan.html

This will help you out

[happygu]

Disrtributor - not too far from you.....

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[patrolone]

Thank you very much for your help mates!

[patrolone]

Back on this thread again...
I have installed an heavy duty clutch.
According to the mechanic, the tires are big (not too big) and the original 4.625 ratio is near to the limit of his range so in the daily driving the clutch suffers.
For this reason he thinks' better to change the diff ratio to a lower 5.43 because it take two benefits: less stress for the clutch during on road driving and a real lowering when offroading.
The only lower ratio for low gears in the transfer case may not exclude the hard working of the clutch in daily driving and if you take a look to this chart I think is not completely wrong..... http://www.4lo.com/calc/geartable.php

what do you think?

[macca86]

Two sets of tyres maybe 31's for road big ones for play

[MudRunnerTD]

I think your mechanic should go back to working on Arctic Trucks running 42" tyres!,

DONOT CHANGE YOUR DIFF GEARS TO RUN 35s or less. Plenty of guys in Australia running 35s on a 2.8 and probably NONE of them have 5:4s in.

Install 85% Low Range into your low range and never look back

Your fuel economy would be terrible running with 5.4s it would be revving high at hwy speed

[patrolone]

MudRunnerTD,
did you see the linked chart?

[Alitis007]

5.4:1 is higher then 4.6:1, if you want lower the number get smaller not higher!

If your wearing clutches out that fast you need to adjust your driving style!!!

[patrolone]

Alitis007,
I know 5.4 is HIGHER than 4.6 but I mean that with 5.4, instead of 4.6, and 34'' tyres the car goes slower.
Maybe the driving style is to be considered too, but I'm only trying to do the right choice in order to fit the setup of my car the nearest to my needs and this is what I'm looking from this forum.

[Alitis007]

Alitis007,
I know 5.4 is HIGHER than 4.6 but I mean that with 5.4, instead of 4.6, and 34'' tyres the car goes slower.
Maybe the driving style is to be considered too, but I'm only trying to do the right choice in order to fit the setup of my car the nearest to my needs and this is what I'm looking from this forum.

As said before your more likely to get a better result by changing you transfer case gearing then your diff gears. From what you posted earlier your goal is to change the final drive ratio in 4L for crawling.

Try and remember that a bigger wheel doesn't turn slower it is just harder to turn but travels further in 1 revolution.

So what are you trying to achieve??

[MudRunnerTD]

George he is trying to use the gear ratio in the diff to relieve the clutch and allow the torque of the motor to help turn the 34s easier. His mechanic is saying that the 5.4s will turn the 34s easier, yes they will but your cruising speed will see you engine revs considerably higher and your fuel use age will increase.

Given that most real force will be exert through your drive train while in steep and rocky country crawling in L4 turning your 34s (small tyres in Australia) your driving style sees you riding your clutch in these instance to help your little 2.8 crawl effectively. Swapping out your Low Range transfer gears for a 43% or even an 85% reduction gear will change your world mate. With 85% reduction you could point your car up a 35degree hill, put it in L1, let the clutch out, let it start driving and GET OUT OF THE CAR AND WALK and beat it to the top! Seriously!

Reduction gears would be like fitting a Massive Turbo to the Low Range mate! But without the need to spool the turbo through the clutch like you are now

[Alitis007]

Ok Darren, in that case being a diesel he could drive it below idle and not have to ride the clutch so much to get going like a petrol. A video of how Patrlone drives on rd will be the key in figuring out how to stop him burning clutches so fast

[macca86]

It has to be driving style there's people here who have 2.8 with 35's my old roommate had one set up like that for two years and never had clutch issues

[patrolone]

Yes, MudRunnerTD it's exactly what I'm trying to say.
What seems strange to me is the fact that nothing similar happened to me in the past years with toyota KZJ73 3.0 TD 150Hp and toyota LJ70 2.4 TD 90Hp. both driven with 34".
I'm wondering if this clutch weakness is due to the previous owner driving style.....maybe... it's not to be exluded.
Now with the new reinforced clutch and the 85% lower gears in the transfer case I'll see..

[Alitis007]

My friend it would have to be from the previous owners driving style !! Have fun and let us know how you go, and remember plenty of pic's!!!!

[MudRunnerTD]

Mate I can't wait to hear how you like the 85%ers!!! The will blow your mind!!

No doubt at all its the previous owner if you only recently purchased it. Going back to the start of this thread the feed back you got was that the clutches are strong. Now your Bullet Proof!

Enjoy!

[BigRAWesty]

George he is trying to use the gear ratio in the diff to relieve the clutch and allow the torque of the motor to help turn the 34s easier. His mechanic is saying that the 5.4s will turn the 34s easier, yes they will but your cruising speed will see you engine revs considerably higher and your fuel use age will increase.

Given that most real force will be exert through your drive train while in steep and rocky country crawling in L4 turning your 34s (small tyres in Australia) your driving style sees you riding your clutch in these instance to help your little 2.8 crawl effectively. Swapping out your Low Range transfer gears for a 43% or even an 85% reduction gear will change your world mate. With 85% reduction you could point your car up a 35degree hill, put it in L1, let the clutch out, let it start driving and GET OUT OF THE CAR AND WALK and beat it to the top! Seriously!

Reduction gears would be like fitting a Massive Turbo to the Low Range mate! But without the need to spool the turbo through the clutch like you are now

85% reduction.. you could be in L5 ans still walk quicker...

So what is your ground speed in l5 with 85%..??

Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[patrolone]

Hi everybody,
more than 1 year has passed since my message.
Meanwhile I found out the reason why the clutch failed so early.
The turbine was blocked and to get the most possible power on the obstacles I had to stress engine and clutch.
Now the engine is optimized, the turbine works properly and my patrol is really aggressive!