hi guys just wanna pickle ur brains a little.

does anybody know if its is possible to replace the centre diff of a normal sti gearbox, to that of a dccd type? providing you have dccd wiring loom, ecu and thumbwheel?? and would the variable diff feature work?

the reason i ask this, is because my v3 type r had gearbox code TY752VB4CA with the dccd. Now the dccd never used to work. Everytime i would alter the diff ratio with the thumbwheel the car would clunk to death and refuse to move at all!! Later on i read up about it, and apparently that gearbox code is linked to wrx/type ra/sti version 2.

My car should have had the gearbox code:
TY752VB5CA which is version 3/4

im just thinking that maybe it wasn't the actual centre diff that was buggered on my gearbox, rather that gearbox was not compatible with the dccd unit??

any help would be great

cheers

 

looks like nobody knows mate. wish i could help

 

Do you know if the rear diff was also changed to match the Ver2 gearbox? Because a Ver2 STi type Ra gearbox would have a 3.9 final drive ratio, with the same ratio rear diff.
Your type R would have a 4.444 final drive, so that could be your problem. As the Dccd is open in the bottom position, the car would drive, but as you locked the diff the different ratios front and rear would fight against each other.

 

i think u may have a very valid point ma friend... hhmmm... im forever learning with these cars!!!

 

i think u may have a very valid point ma friend... hhmmm... im forever learning with these cars!!!

 

The centre diffs from all the 5 speeds are interchangable, as long as you include the centre casing as well. Problems arise trying tho build a DCCD into a gearbox using its original non DCCD casing.

If its a JDM car then the transfer ratios between non dccd and dccd are the same , so no issues there - problems arise with EU/UK cars witht different transfer ratios (1.1:1) to the JDM/ DCCD ratio (1:1)

A dccd will work without the ECU and thumbwheel etc, it will be open all the time, i.e torque split 35F 65R.

 

Rereading the thread, DCCD or not - if your rear diff is different from the front you're doing damage!