How to confirm your transfer box ratio - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools
Old May 11th, 2016, 06:35 PM
Status: Offline
Gary Patterson
1990 LHD Tithonus
Join Date: Mar 2016
Location: UK
Posts: 24
How to confirm your transfer box ratio

I bought a secondhand disco 1.2 transfer box for my 200tdi defender and before fitting new seals and installing, I wanted to check that it hadn't been retro fitted with an alternative ratio. I realise it's not rocket science but thought that the following might help anyone else wanting to check the same.

My box is already off of the car but it could be easily checked on the car by jacking a rear wheel, removing the PTO cover and paint marking the input gear from the other side.

Rotate the handbrake drum to remove any slack.
Paint a reference mark across the drum and it's back plate.
Paint a mark at 12 o'clock on the input gear
Rotate the brake drum one full revolution so that drum paint marks line up again.
Check the new position of the paint mark on the input gear. It will have moved one complete revolution plus a certain number of 'minutes' after its original 12 o'clock position depending on the final drive. It will be one of 3 positions. If you have the 1.22 drive then it will be 13 minutes past. The 1.4 drive will leave it at 24 mins past. The 1.67 will be 40 mins past.
If you look carefully, you can see my paint mark has indeed moved to the 1.22 position.
Hope that helps someone
Attached Thumbnails
Click image for larger version

Name:	brake drum marks.jpeg
Views:	45
Size:	216.5 KB
ID:	149265   Click image for larger version

Name:	paint mark 12oclock.JPG
Views:	40
Size:	196.1 KB
ID:	149266  

Click image for larger version

Name:	Transfer box ratio guide.jpg
Views:	45
Size:	227.7 KB
ID:	149267  
Reply With Quote
Sponsored Links

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Transfer box 1.66 ratio.. the rover shop For Sale - Parts 1 December 14th, 2015 08:07 PM
LT230 Transfer Case, 1.410 Ratio RyanS For Sale - Parts 23 January 10th, 2011 02:25 PM
New transfer case 1.2 ratio pendy For Sale - Parts 0 September 27th, 2010 02:37 PM
1.2 ratio transfer case for 1995 Disco dave_lucas Wanted 3 August 13th, 2010 12:57 PM
1.4 ratio transfer case dave_lucas Wanted 2 November 13th, 2004 02:16 PM

All times are GMT -5. The time now is 10:38 PM.