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Tomo44

Member Since: 07 May 2021
Location: Cornwall
Posts: 6

Transfer box diff fault

Had vibration from drive train, took the front drive shaft off to check front end, found I had no drive to the back wheels even with diff lock on, hand break still works, could it be diff fault or transfer box?

7th May 2021 9:52pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Does the rear prop shaft turn when trying to drive? if yes, then the fault lies with the back axle (diff, half shafts, drive flanges). If no, then it's most likely the transfer box.

Thinking about it a bit more, the fact that the handbrake works suggests that the fault is in the transfer box, too. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

8th May 2021 11:30am

Tomo44

Member Since: 07 May 2021
Location: Cornwall
Posts: 6

I thought that but then if the handbreak locks the back axel it proves nothing as the back wheels will be locked if it's the transfer box and the transfer box if it's the rear diff, further investigation has suggested the diff lock isn't engaging, link looks good so changing the transmission fluid to see if any metal appears

8th May 2021 11:41am

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5729

2006 Defender 110 Td5 USW Zermatt Silver

You drive (without diff lock) your Defender and get a vibration. Then you take the front prop off to check it. But now have no drive to the rear, and non operating diff lock.

This can’t happen. If you have no drive to rear, and non operating centre diff lock you wouldn’t be able to drive the vehicle.

8th May 2021 12:07pm

Tomo44

Member Since: 07 May 2021
Location: Cornwall
Posts: 6

Yes but I didn't know the diff lock wasn't engaging, addressing this problem now

8th May 2021 1:45pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3425

2012 Defender 90 Puma 2.2 CSW Santorini Black

The diff lock switch is acting on the locking hub, so assuming that the wiring is good and dash light is also good, the light would come on when it is truly locked.

The diff lock lever is right above the front output flange. Easiest access is through the middle hatch in the seatbox, under the cubby box or middle seat.

I am assuming you remove the front prop shaft to isolate the vibration issue. Correct?
Propshafts have balancing plates welded to them, and if they fall off, they can vibrate. Check also that the crosses are in good condition. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

8th May 2021 2:01pm

Tomo44

Member Since: 07 May 2021
Location: Cornwall
Posts: 6

Prop shafts both have plates both and are sound, still can't get the diff light on, I've checked I have drive to both shafts and I do, sitting still both torq up when power applied, when the rain stops, tomorrow, I shall remove the switch and test it after that I am lost for a solution to the diff lock issue and none the wiser on my vibration issue
Cheers for the help

8th May 2021 2:09pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5729

Tomo44 wrote:
Yes but I didn't know the diff lock wasn't engaging, addressing this problem now

You’ve removed the front prop, and now the trans box is spinning the easiest route, the front drive flange, as you’ve removed the prop. So no diff or axle problems, just need to sort the diff lock. Take the covers off from inside the defender and expose the top of the trans case and you will see the operation rod. Easy to remove cover and check that grub screw that operates inside shaft is tight and moving shaft.

8th May 2021 2:14pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3425

^^^ IIRC grub screw is only on the high/low shaft.

The cover for the diff lock is the rounded one with 3 bolts. It does not take a gasket as it seals with an O ring. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

8th May 2021 3:12pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8061

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Just wind out the diff lock switch a few threads, it's stopping the lock engaging. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

8th May 2021 9:50pm

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