berg Posted September 5, 2015 Share Posted September 5, 2015 Currently doing a manual conversion on my car I purchased an lsd to go on as when my car is jacked up i spin one wheel and only one would spin and i was told that was an open diff Now its off the car if i spin the prop flange both drive cups spin the same way. If i spin one drive cup then both spin opposite ways The new LSD i have got does exactly the same as what ive removed Can anyone help me as i cannot see any marking or numbers on either diff This is what ive removed and looks identical to what i have bought Quote Link to comment Share on other sites More sharing options...
Andrew K Posted September 5, 2015 Share Posted September 5, 2015 (edited) Best way to make sure what you've got is open it up and take a look inside, think that's the only way to be 100% sure of what Diff it is. I have a spare LSD Diff and an Open Diff that are both of a TT Auto and they both look like the above picture. Edited September 5, 2015 by Andrew K (see edit history) Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted September 5, 2015 Share Posted September 5, 2015 Yep, pull the cover off and take a look. Left one is open, right is LSD Quote Link to comment Share on other sites More sharing options...
Chris88 Posted September 5, 2015 Share Posted September 5, 2015 The only sure-fire way to tell the difference is to open it but if you have a friend handy you can get a good idea without opening it. If you spin the propshaft input of either an open diff or an LSD then both drive cups will spin the same way, if they didn't they wouldn't work at all. Here's what I did when I had two diffs on the bench just as you do now and we could tell the difference. Have a friend turn the propshaft input. Use both hands to apply resistance to the drive cups more or less equally so that they both turn in your hands. Reduce the resistance significantly on one drive cup. If it's an open diff your friend will find it easier to turn the propshaft input and if it's an LSD your friend will feel no significant difference because the LSD will add resistance to try and balance the outputs. Quote Link to comment Share on other sites More sharing options...
Nic Posted September 5, 2015 Share Posted September 5, 2015 What is the axle code on your VIN plate? that'll tell you what diff you had fitted. Quote Link to comment Share on other sites More sharing options...
berg Posted September 5, 2015 Author Share Posted September 5, 2015 Ok thanks ill have to whip the cover off if theres no other way of knowing Would have been good to compare both to know for sure but i have no sealant to seal it back up and new diff is going on tomorrow Vin plate wont be a sign as the car was reshelled long back. Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 5, 2015 Share Posted September 5, 2015 Yep you can fit it, put it in 1st Rev to about 5k RPM and drop the clutch!! If it leaves two big black lines up the road behind you it's an LSD;) Quote Link to comment Share on other sites More sharing options...
berg Posted September 8, 2015 Author Share Posted September 8, 2015 Thanks fuys looks like an lsd then Quote Link to comment Share on other sites More sharing options...
Fizzy T Posted September 25, 2015 Share Posted September 25, 2015 Looks in good condition too, good buy. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.