szybura Posted March 29, 2010 Share Posted March 29, 2010 I have an LSD and the tag is missing. How would I figure out the gear ratio without opening it up? Is that the only option I have? Thanks Quote Link to comment Share on other sites More sharing options...
john in KY Posted March 29, 2010 Share Posted March 29, 2010 It is a 3.70 if it came from an older Subaru. If from a newer Legacy, who knows? Quote Link to comment Share on other sites More sharing options...
Twitch de la Brat Posted March 29, 2010 Share Posted March 29, 2010 Spin the input shaft, and count the number of times the diff stubs spins per spin, or visa versa, and count the number of spins it takes to spin the input shaft. Twitch PS: I may have that backwards... Quote Link to comment Share on other sites More sharing options...
Turbone Posted March 29, 2010 Share Posted March 29, 2010 This should answer your question... A little research before spitting out answers helps alot. Quote Link to comment Share on other sites More sharing options...
szybura Posted March 30, 2010 Author Share Posted March 30, 2010 Thank you for the information. That's an easy to remember formula. Quote Link to comment Share on other sites More sharing options...
szybura Posted April 4, 2010 Author Share Posted April 4, 2010 Tried the spinning and counting and got 1.9-2.0 count on the ratio. Turned the input yoke locking one output spline, tried counting the yoke by turning the output spline ,with one locked down. 1.9-2.0 to 1. never read about ratio's like that. What did I do wrong? Quote Link to comment Share on other sites More sharing options...
Txakura Posted April 4, 2010 Share Posted April 4, 2010 what is the car it came from? Quote Link to comment Share on other sites More sharing options...
Gloyale Posted April 4, 2010 Share Posted April 4, 2010 I have an LSD and the tag is missing. How would I figure out the gear ratio without opening it up? Is that the only option I have? Thanks Pulling the rear cover is the best way to be sure. You don't need to unbolt the side bearings though. It will give you a good chance to inspect the gear teeth and the spiders, and change the fluid. Just use good sealant for reassembly. Quote Link to comment Share on other sites More sharing options...
Twitch de la Brat Posted April 5, 2010 Share Posted April 5, 2010 Tried the spinning and counting and got 1.9-2.0 count on the ratio. Turned the input yoke locking one output spline, tried counting the yoke by turning the output spline ,with one locked down. 1.9-2.0 to 1. never read about ratio's like that. What did I do wrong? Hold on, if you were able to lock one diff stub in place, you either don't have an LSD, or its completely shot. And if you accidentally counted every 1/2 turn rather than every full turn, it sounds like you have a 3.9. Twitch Quote Link to comment Share on other sites More sharing options...
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