Low range disappointingly jumpy

Had a P38 before and low range was smooth, I would have it in 1st and could happily accelerate and decelerate without a problem, however my current P38 DSE manual seems quite harsh when I decelerate or accelerate even when just tickling it. Any thought on why this is? I looked at a Discovery TD5 thread that mentioned about the ECU confused about being in Low or High range but didn't know if this was related.

Thanks

I run a 2.5DT manual and agree in 1st/low the drive can be snatchy.

I find that most of the time I just feed in the clutch very slowly at tick over, even when reversing my trailer up hill.

I don't know if a manual vehicles tells the ECU its in low ratio box, I believe an auto does to stop the engine over reving and/or locking up the torque converter on hill starts .

Did your previous rangie have an auto gearbox?


PS.

How many miles on the clock, just thinking of streched/worn transferbox chain???

My last P38 was also a manual, however you mention miles on the clock and I have 167k of them so interesting that you say about the transfer box chain. Is it something that can be tightened or are we talking replacement chain?

Thanks

you cant tighten it ,they give very few problems ,by the time they wear thers allready alot of slack in the whole vehicle,you can feel it by jacking front and rear wheel on passenger side and rocking brake drum

virtualme123 said:

My last P38 was also a manual, however you mention miles on the clock and I have 167k of them so interesting that you say about the transfer box chain. Is it something that can be tightened or are we talking replacement chain?

Thanks

Click to expand...

If the chain is stretched the only way to remove the slack is to replace the chain, oil seals and time, depending on available equipment/tools and skill about a mornings work for me, possibly a weekend for others.


Transfer Box Drive Chain STC3238 Island 4x4 - Specialists in Land Rover and Range Rover Parts and accessories for all models. UK and worldwide mail order.

its rare for slack chain

Is the rocking the jacked up passenger side idea a sure fire way of working out if the transfer chain is slack? I'm happy to replace the chain if that is the problem but want to be sure as some people are saying its a bit rare.

Another note to add is that I have started to notice that actually driving around in high range when I sometimes take power off and on there is a similar jolting, I assume they are related...

Thanks

high/low is done with epicyclic behind gear box at top of t/box chain is just geared slower or faster,it is rare but not impossible ive stripped a few with wear marks on case where chains been rubbing but not many,you should feel chain rolling on sprocket and ascertain too much slack ,but could just be wear on entire drive chain

Would it be perhaps a better idea for me to replace the whole transfer box because after 167k it might all be pretty warn?

Cheers

you dont know its the prob yet ,t/boxes are better than most units on vehicle for lasting

virtualme123 said:

Would it be perhaps a better idea for me to replace the whole transfer box because after 167k it might all be pretty warn?

Cheers

Click to expand...

What do you replace it with, unknown S/H transfer box or a hugely expensive new unit (a questimate at the price anyone?).

If the chain is streched it could cause drvetrain slap, other possabilities are, prop shaft U/J's worn (cheap to replace, easyish to do), diff wear, possibly front axle driveshaft U/J's and the main gearbox worn.

And an outside possibly, dual mass flywheel slap.

Does your engine run lumpy at tick over???

zzr1200 said:

What do you replace it with

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Exchange unit from Ashcrofts? Search them on google. But as you say you could basically end up working your way through the entire drive train.

Well it doesn't run lumpy on tick over, as I say most noticeable in low range but also can feel it in high range a bit when I go on or come off the accelerate. There is a nice whurring sound from the gearbox area when I'm driving along, but as you say could be one of a few things. Someone mentioned to me about the gearbox mounts maybe being an issue if they have worn out?

Thanks