Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

a few transmission/diff questions...


  • Please log in to reply
6 replies to this topic

#1 nw_david

nw_david

    USMB Regular

  • Members
  • PipPipPip
  • 86 posts
  • ferndale

Posted 05 December 2007 - 01:38 AM

i've got an 85 gl turbo wagon sitting in my garage, does it have a lsd diff or is that just gl-10s? also am i correct about automatic's 3.7, and manual 3.9 diff ratios? if that is right, have people opened up automatic transmissions to get out the 3.7 to put in a manual transmission? i'm asking about all this because i have a 91 loyale (manual), a spare d/r 5 speed, and that turbo car's automatic trans.

#2 john in KY

john in KY

    1000+ Super USER!

  • Members
  • 1,259 posts
  • KY

Posted 05 December 2007 - 07:09 AM

Look at the rear diff. If LSD it will have a metal tag stating this. Or just jack up the rear and turn one wheel. If the other wheel turns in the same direction then it has the LSD. You are correct about the ratios.

#3 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,075 posts
  • WV

Posted 05 December 2007 - 10:41 AM

is the 85 an EA81 or EA82? if that turbo car is an automatic then i guess it has a 3AT transmission in it - that thing won't be compatible with anything and is worth the most by dropping it off to the scrap yard. get rid of it and swap to a manual transmission. don't bother saving any parts off of it, they are not compatible if it's a 3AT.

if you want a 3.7 final drive ratio, forget swapping front diffs, that is an enormous job that you don't need. just get a manual transmission that has a 3.7 final drive. any turbo manual trans will have 3.7 final drive, an RX (they are all turbo's) or an XT Turbo manual transmission will definitely have a 3.7 final drive.

in reality the 3.7 verses 3.9 final drive isn't much of a difference so just use what you have. someone did the calculations on this board, the difference isn't all that large.

for EA82's - it's not model specific for the LSD's - you just have to look. the only model that always has an LSD is an RX - all the rest could go either way.

as for the final drive ratios - i don't believe you can swap front differentials from automatics to manuals.

on the actual ratios - this information is probably already here, did you try searching? there's a "search" button up top in the gray bar. no the final drive is not only different from automatics to manuals. RX and XT Turbo's manual trans have 3.7 final drive. if turbo wagons are the same, which i think they are, then all Turbo's are a 3.7 final drive ratio. a search should clarify whatever you need to know though.

#4 nw_david

nw_david

    USMB Regular

  • Members
  • PipPipPip
  • 86 posts
  • ferndale

Posted 05 December 2007 - 05:46 PM

i just went out and checked, and it's not a lsd. so if i want a limited slip rear diff i'll need to find a rx or turbo xt drive line?

#5 john in KY

john in KY

    1000+ Super USER!

  • Members
  • 1,259 posts
  • KY

Posted 05 December 2007 - 06:07 PM

Lots of GL-10 turbo wagons had the LSD option. Just start looking under any GL-10 model and you'll eventually find one.

#6 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,075 posts
  • WV

Posted 05 December 2007 - 07:52 PM

so if i want a limited slip rear diff i'll need to find a rx or turbo xt drive line?

no, you'll need to find an LSD!! i already answered this:

the only model that always has an LSD is an RX - all the rest could go either way.



do a search for more LSD rear diff information, this place is loaded with information and options. EJ LSD's are easier to find, but they aren't typically clutch type (they are viscous) VLSD and not as beneficial in offroad/snow. so depends what you want it for too. racing or messy driving?

#7 nw_david

nw_david

    USMB Regular

  • Members
  • PipPipPip
  • 86 posts
  • ferndale

Posted 05 December 2007 - 11:42 PM

i guess i'll research more, thanks for clearing up my questions though




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users