4wd transmission proplems, broke gearbox then diff and transferbox updated with broken gear selec Options

[tufy]

2 months ago i broke my gearbox, because i coulnt find stronger gearbox for daily use, i installed a 2nd hand standart gearbox which was slightly shorter... after i installed this g.box, traction of my car was more like front wheel drive.. (%60 front and % 40 rear. thats what i feel). then when i make a quick start i started to feel that rear diff. is slipping gears. after 3000 km i break my rear differential.
does anybody knows if ratio of g.box diff ratio and rear diffrential ratio change it make diff stress and broke easier. or my diff. broke from too much power.
simply;
does it make proplem in a 4wd car if i have shorter ratio gearbox without changing diff..
sorry for my bad english. and thanks for your help.

This post has been edited by tufy: Apr 17, 2007 - 9:49 AM

[Driveby]

ST205 gearboxes tend to be weak over 500bhp, rear diffs are also prone to break when launched at these levels, fensport now run a dog box with a cusco rear diff assembly if I remember right to prevent the failures that plagued them with the Corolla.
I think the gearboxes are £5000 each but they havent had one fail yet to my knowledge.

[tufy]

ST205 gearboxes tend to be weak over 500bhp, rear diffs are also prone to break when launched at these levels, fensport now run a dog box with a cusco rear diff assembly if I remember right to prevent the failures that plagued them with the Corolla.
I think the gearboxes are £5000 each but they havent had one fail yet to my knowledge.

thanks for good info guys..
i called fensport a few times and mailed them about their dogbox, also mailed to a few people that are using this dog box. the proplem is i use my car every day at least 50 kms. and some times i use it hard they dont recomend me a dogbox for daily use. i am working on an other solution. like sequrential shifter with straitcut gears and secronize engagment. unfurtunately there is no sequrential shifter kit for our cars.
now i am planning to buy a cusco 1.5 way rear lsd. its available for st205. but the think is, are they made for my old gearbox or the one i have now:/ i mean will the ratios fit with cusco lsd?

This post has been edited by tufy: Dec 23, 2006 - 9:31 AM

[Coomer]

i am working on an other solution. like sequrential shifter with straitcut gears and secronize engagment. unfurtunately there is no sequrential shifter kit for our cars.

Wouldn't a tranny with straight-cut forward-driving gears be pretty loud, like our cars are when they're in reverse?