i recently bought a gsl-se 's rear-end for my 81.i haven't received it yet but as some of you have told me,the gsl-se's is an open style diff(not lsd).is possible to fit a 84-85(non se) lsd on the gsl-se housing.what mods should be needed?

 

If its an SE type rear end you got on its way its already got a lsd in it.... unless somebody took it out... also if your car is an 81 you will need to buy a 84/85 driveshaft , the flange is bigger on the 84/85....Is your car a GSL model??? if not you need the parking brake cables and the softline [brakefluidline] also... p/s the wheels have a different bolt pattern on the SE models [4X1 .1.25] i believe

 

if you live in Greece, like your location says ... then double-check the bolt patterns. i believe i heard that some of European Rx-7s had the SE bolt pattern, even though they didn't have the SE.

 

in the case it won't contain a lsd i thought that i should buy the torsen diff(mztx-torsen1) from mazdatrix.i hope that it could handle the 250rwhp of my 13bt.what do you think?what are the differences between my stock brakes(81-w/rear discs)and the se's?

 

Not sure about Eurospec SE's but the Canadian model has LSD.

 

i think it was all series 3 other than north america came with a 12A, 12A turbo and a 4x114.3 bolt pattern. only the GSLSE which is a NA only vehicle, was the one that came with the 13B EFI engine and 4x114.3 bolt pattern.
i hope that made sense

 

well, first you would have to confirm if you guys have the bigger bolt pattern or not.

however, over here, the SE brakes are larger than the regular 12A units. they measure 9.8 inches up front and 10.1 inches in the back (versus the 8.9 inches and 7.9 inches of the 12A cars) - and they use different calipers.

both the GSL and GSL-SE rears should be able to handle that power as long as you don't use a killer clutch, AND don't constantly beat the hell out of it. i can confirm that they have used up to 450 HP (flywheel) from a 13B-T before, so that's just something to consider ...

but again, it would be best if you'd confirm what hardware you have in terms of brakes/rear ends in Europe, because i'm not SURE, and trecebe didn't sound absolutely positive either ...