Thread: Transfer Gearbox Disco D2

Originally Posted by justfishing

Hello,
Are all Discovery 2 Transfer gearboxes the same, I have an Auto TD5 2004 would one out of a manual D2, V8 work ?? There seems to be bit backlash mostly from the front output shaft. I will do the drive shafts this week to see if that helps. Might look at rebuilding it later anybody done this ??
Ian

Yep, they are the same. There is some differences between the early D2 ones and the late D2 ones, but that was only a couple of extra switches for various electrical functions.

The only other BIG difference is some have the CDL and some dont.

Cheers.

Del.

d1 tcases also work.

just so happens I know where one is thats reasonabley priced

Originally Posted by Blknight.aus

d1 tcases also work.

just so happens I know where one is thats reasonabley priced

They do bolt on the same, but the D1 case doesnt have the high/low sensor switch to let the ecu know. This can , however, be easily overcome by putting in a simple switch, or welding a boss on the front housing and fitting the switch.

Cheers.

Del.

They aren't the same, because there are differences. They are interchangeable.

General
The LT 230SE transfer box is mounted at the rear of the gearbox and transmits drive via high or low reduction ratios
to the front and rear axles via the propeller shafts. The high/low ratios are 1.211:1 and 3.32:1 respectively.
Transfer boxes fitted to this model have the prefixes 41D and 42D to the unit serial number. Prefix 41D denotes that
the unit is not fitted with interlock whilst 42D denotes that interlock is fitted.

Vehicles up to 03 model year – Whilst similar to LT230Q transfer boxes fitted to other models, the LT230SE transfer
box has certain engineering modifications incorporated which are as follows:

• Uprated torque capacity
• Modified front and rear output and cross shaft housings
• Intermediate gear bearing pre-load now controlled by a selective, non-collapsible spacer
• Speedometer drive and driven gears not fitted for this application
• Modified high/low sleeve
• Modified front output flange and mud shield
• Differential lock fitted to certain vehicles, but no longer driver operated
• Fixed setting of differential lock warning lamp switch on vehicles fitted with differential lock

Vehicles from 03 model year – The LT230SE transfer box is as described above for vehicles up to 03 model year
with the following modifications:
The following items are introduced on vehicles from 03 model year

• Ribs added to main casing to reduce operating noise
• Bearing retaining nut on the differential carrier has patchlock added to the threads
• Interlock solenoid moved from main casing to selector lever assembly
• Intermediate gears modified with machined internal shoulder and bearing circlips deleted

The following items are introduced later in the 03 model year build programme and therefore may not appear on all
03 model year vehicles

• Driver operated differential lock (if fitted)
• High/Low selector shaft fitted with spring assist
• Existing differential lock switch replaced by new design switch.
• New secondary differential lock switch installed in the front output housing

Do both auto and manual transfer boxes have an interlock solenoid?

EDIT: It's just north american and japanese discos

Guys- what about part of the original question "There seems to be bit backlash mostly from the front output shaft. Can this bearing for the front output shaft be changed while the gearbox is in place ?? I will do the drive shafts this week to see if that helps. Might look at rebuilding it later anybody done this ?? "

I have a "clank" every now and then from that area mainly going between Drive and Reverse.

My front propshaft (Woody's) is fine and I suspect front output shaft.

you can almost rebuild the box while its in situ, you just cant dismantle the "idler gear" shaft

Originally Posted by Rocky88

Do both auto and manual transfer boxes have an interlock solenoid?

EDIT: It's just north american and japanese discos

What is an interlock solenoid?