Jointed rear radius arm installation question - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old March 18th, 2015, 12:11 AM
89Defender90
Status: Offline
none
none
Registered User
 
Join Date: Dec 2014
Location: nowhere
Posts: 103
Jointed rear radius arm installation question

I put a set of Terrafirma rose jointed rear radius arms on the truck. My question is...do I install them to the same length as the originals or adjust them so the pinion angle is -1 degree? Does it matter? I'm inclined to use the adjustability to set the pinion angle.
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old March 18th, 2015, 12:14 AM
Ash's Avatar
Ash
Status: Offline
Ash Heller
OM606 110 Frankenstein
D-90 Source Vendor
 
Join Date: Dec 2005
Location: Orlando, FL
Posts: 665
It depends on your driveshaft. If you're using the stock single-cardan setup you want the pinion to be parallel to the output on the t-case. If you have a DC shaft you're normally looking for about 1-2 degrees less than the angle of the driveshaft.

-Ash
__________________
Geared Restoration Co.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

352-572-3236

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #3  
Old March 18th, 2015, 12:24 AM
89Defender90
Status: Offline
none
none
Registered User
 
Join Date: Dec 2014
Location: nowhere
Posts: 103
Stock single. Don't tell anybody, but I'm a Chevy guy. When you set the pinion angle, you typically want -1, but no more than -3, because when you accelerate, the rear diff will actually increase a degree or two from the torque......Not that the 80ish hp from the 2.5 petrol could possibly impart that much torque, but am I thinking the right way here?
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old March 28th, 2015, 01:59 PM
89Defender90
Status: Offline
none
none
Registered User
 
Join Date: Dec 2014
Location: nowhere
Posts: 103
Finally got around to adjusting the rear arms. I started with the new arms at stock length. I found that the axle was 1/8" closer to the frame mount point on the LH side. Starting angle at the transfer was 1 degree and rear pinion was 5 degrees. I ended up adjusting the RH side 3/8" longer and the LH side 1/2" longer to get the rear pinion to 2 degrees. I compressed the rear suspension about an inch to mimic a load, the transfer measured 1.5 degrees. Because of the way the radius arm end is welded off center, you can only do adjustments in a full turn at a time, if that makes sense. I tried to adjust the pinion further and it ended up 1 degree. After compressing the suspension it ended up still being 1/2 degree difference.


I'm curious to see if the LT hand mount point is actually welded 1/8" further on the frame than the RT side. I'll find out when I get an alignment.
Reply With Quote
  #5  
Old March 28th, 2015, 02:21 PM
Jpayne's Avatar
Jpayne
Status: Offline
Jeff Payne
'83 110 3 Door
Member
 
Join Date: Aug 2009
Location: Albuquerque, NM
Posts: 1,393
Registry
You might take measurements from a few reference points. Try the transmission mount to your rear axle and see what that reads.
Reply With Quote
  #6  
Old March 31st, 2015, 06:54 PM
89Defender90
Status: Offline
none
none
Registered User
 
Join Date: Dec 2014
Location: nowhere
Posts: 103
Finally got the front arms on, so I took a measurement from front axle to rear axles...you guessed it, the Lt side is 1/8" farther away. So I adjusted the Lt rear arm back to the same length at the Rt side and now the axles are parallel to each other. I guess the Rt side front mount is 1/8" off too. At least all arms are the same length, I was starting to get worried. Now I'm wondering if the truck goes down the road sideways. I'm going to have my wife drive behind me and tell me. I guess I could let her drive and me follow...Nah, she'd probably drive it into the ditch!!
Reply With Quote
Reply

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

Tags
installation

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
RTE curry jointed geaseable rear links Rover brit For Sale - Parts 4 April 11th, 2013 11:15 AM
Radius arm size question jayz Defender Technical Discussions 4 September 3rd, 2012 03:05 AM
Radius arm and trailing arm nut size dave_lucas Defender Technical Discussions 3 February 25th, 2010 04:44 PM
Radius Arm Bushing Question Craig T Defender Technical Discussions 4 April 16th, 2009 09:02 PM
Heim Jointed Trailing Arms woldd90 Misc. Chit-Chat 1 March 23rd, 2006 09:58 PM


All times are GMT -5. The time now is 07:26 AM.


Copyright