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LandymanStefan



Member Since: 30 Aug 2017
Location: Surrey
Posts: 881
England 2001 Defender 90 Td5 SW Epsom Green
LT230 Whine 70+mph
Hi all just wondering if anyone has any bright ideas about my transfer box or if I should just accept it's a Land Rover box and it's going to whine a little bit.

Last year I changed the final drive ratio in my box to a 1.222 with an Ashcroft kit. Overall the process went as well as I thought it could and it made a great difference to the car (2001 td5 with 39k miles) the only thing that has happened since is that it now has a slight (steady/constant) whine at 70mph and above. I left it 1500miles just in case it was the new gears bedding in but there hasn't really been any improvement. I've contacted Dave at Ashcroft and he told me to drop the oil, pop the side off and check the intermediate gear for any play in case I didn't crush the spacer enough. So I've checked the gear and there is no play. The car is on the drive with the side off the box at the moment so has anyone got any other ideas or things I should check before sticking it back together? Or should I just accept it's a Lr box and I should consider myself lucky it only whines at 70+mph.
Post #712968 18th Jun 2018 8:47am
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Hufflepuff



Member Since: 25 Oct 2014
Location: Hampshire
Posts: 727
England 2005 Defender 90 Td5 XS CSW Tonga Green
I can't really offer much help other than to say mine does the same Stefan, with the 1.22 kit in. I guess i'm about at about 10,000 miles since I had the ratio's changed - i'm not 100% sure if its coming from the R380 or the transfer box if I'm honest.

Its not a terribly loud noise though, in the grand scheme of things at 70mph Razz 2005 Td5 90 XS
1989 V8 110 CSW
Post #712981 18th Jun 2018 12:20pm
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LandymanStefan



Member Since: 30 Aug 2017
Location: Surrey
Posts: 881
England 2001 Defender 90 Td5 SW Epsom Green
Haha ok that's reassuring. My whine isn't exactly significant compared to the total noise at 70mph as you say but I feel like if there is a noise I can reduce it might help the overall headache on the motorway.
Post #712983 18th Jun 2018 12:24pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8058
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Phone Dave again and ask him? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #712988 18th Jun 2018 12:52pm
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LandymanStefan



Member Since: 30 Aug 2017
Location: Surrey
Posts: 881
England 2001 Defender 90 Td5 SW Epsom Green
He said there's not much he can think of without seeing the box. I did go out this morning and gave the gear and good two handed shake and there is possibly a tiny bit of play in it. I might try tightening the nut and nats and see if it dissapears.
Post #712999 18th Jun 2018 1:29pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2237
United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
was the new gear kit you fitted the later type (LT230Q) or the older type (LT230T)?

I believe the later LT230s had modified tooth profile to make them a little less noisy. I was wondering if the kit you fitted was the older tooth style?

Description from the rebuild manual:
Quote:
The LT230Q, whilst similar to the LT230T differs
mainly in the following areas:
Helix angle of gears increased to 31° together with
an increase in the number of gear teeth thus giving
quieter running and an increase in power
transmission efficiency.
Increased length mainshaft input gears together with
increased thickness bearing housing and
repositioned bearing.
Redesigned intermediate gear bearings.
Redesigned high gear bush giving quieter running
 02' 110 TD5 Double Cab Rebuild Thread
Post #713001 18th Jun 2018 1:55pm
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652
United Kingdom 2003 Defender 90 Td5 HT Alpine White
Snap. I've had a whine for 20k plus miles on my 1.2. I'm waiting for it to get worse or something to fail. I'd guess it's ever so slightly worse but it just keeps going 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #713038 18th Jun 2018 4:40pm
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LandymanStefan



Member Since: 30 Aug 2017
Location: Surrey
Posts: 881
England 2001 Defender 90 Td5 SW Epsom Green
So I had a tinker this weekend. I figured I would try and get a bit more on the intermediate shaft nut. There was no free play or wobble on the gear but Dave said it's very difficult to overtighten them. Out came the big breaker bar and I gave the nut a heave. As you can see the old peen mark in the picture it went a touch then stopped dead and would not budge any more. I checked the intermediate gear would still turn freely which it did.


Click image to enlarge

To tighten the nut I had to remove the prop and handbrake drum.

As a result the whine has been reduced to a negligible level, I'm not sure if it the tranny box or just general transmission noise. So I'm pretty happy with the result. Re peening the nut isn't ideal in situ but I got a bit of a dink in it with a screwdriver but may try to improve it on the weekend.
Post #714807 27th Jun 2018 6:07pm
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