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LT230 Transfer Box R Type & T Type

The LT230 series Transfer Boxes were introduced in 1983 with the LT77 5 Speed Gearbox range. The first boxes were known as the LT230R. These were updated in 1984  with a change to the Intershaft and Intermediate cluster to enable stronger Taper Bearings to be used. These later boxes are known as "T" type boxes (LT230T). Although there are some common parts to the two types of boxes there are some items that are now either unavailable or expensive to obtain. The good news is that the LT230T type can be fitted as a unit in place of the original LT230R. This also makes good sense for subsequent replacement of spares. Click here for the largest range of transfer box parts

Check our picture below for location of Serial Number to assist in identification.

 LT230 Transfer Box

The Serial number of the LT230 Transfer Box should be found either on the bottom side above sump by drain plug or sometimes on the end face. See the examples above.

The LT230 unit has a serial number consisting of a prefix, 6 digit number, and suffix. This serial number will determine the type of box & ratio. The suffix will determine the approx date of manufacture and gear design used. Below you will find a table showing most of the common variations.

If you have other queries regarding your transfer box set up please contact us.

LT230 Transfer Box Serial Numbers

 

Prefix
Type Ratio
Typical Applications 
12D
 R 1.667  
13D 
 R 1.410 
 
14D 
 R 1.003  
15D  R

1.192

 
20D  T 1.667 
 Defender 4 Cyl Non Tdi
22D 
 T 1.410 
 Defender 4 Cyl bar 2.5 Diesel Nat Asp.
25D 
 T 1.410 
 Defender 110 V8 With LT85 Gearbox
26D 
 T 1.003 
 RR Classic with 3 speed Chrysler Auto
27D 
 T 1.192 
 RR Classic up to 1985
28D
 T 1.222 
 RR Classic 1986 0n & Disco 1
29D  T 
1.192 
 Defender 90 V8 with LT85 Gearbox 
32D 
 T 1.222  4 Cyl & V8 3.5 fitted With LT77S Box
34D 
 T 1.410  Discovery V8 & 2.0 Mpi
36D 
 Q 1.211  Discovery
37D  Q 
 

 Discovery

38D 
 Q 
1.211 
 Defender V8 4.0 
40D  Q 1.211 
 Japan / South Africa 
41D 
 T 1.211  Disco 2 With Diff Lock Stud
42D  T 1.211 
  
43D 
  1.410 
 Defender TD5 
       

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