GC8 wrx gearbox whine

[r338me]

so ive got an nz new 1998 wrx that ive been told has the RA gearbox but not too sure. during this week ive had the center diff out, welded, and front cv\'s removed so obviously now its rear wheel drive.

for about 2 hours it was great, drove awesome but then started developing a whurry/ whining noise from the gearbox. its not a crunching noise or anything its a smooth CONSTANT whining noise thats quickly getting worse.

it never stops and it goes with road speed, not engine speed. so in any gear it stays the same, just gets higher pitch and louder the faster i go.

could it be a bad center differential bearing from welding it? or something just coincidentally wore out? thanks for any help in advance

[Eight_dollar]

Just put it back to how it\'s meant to be and enjoy awd.

[r338me]

thats not an option... its horrible in awd. i know its not "because ive modified it", ive seen plenty of people including a friend who drifts an rs run this set up for a long time with no issues, somethings just gone bad this time...

[tebbyj]

Sounds like an output shaft bearing, does it get worse on overrun or acceleration?

[funkytown]

 r338me said:

for about 2 hours it was great, drove awesome but then started developing a whurry/ whining noise from the gearbox.

and how did you treat it once suddenly RWD... beat the living snot out of it id imagine, and had some sustained loss of traction..?

[r338me]

it stays the same constantly, only changes as the car speeds up or slows down, where i put the accelerator pedal doesnt make any difference.

no i didnt thrash it, its been treated a lot worse while in awd and never gave any issues. it gave out straight after being converted and it wasnt beaten so i suspect it has something to do with the way i did it or put it back together rather than how i drive it.

it could be the output shaft bearing... it could also be the center diff bearing couldnt it? perhaps the way the guy welded it damaged the bearing?

[loner]

is it a clean and constant whine, or more of an intermittent rumble? Does it do it more when decelerating? do

you have hard gearbox or rear diff bushes?

[r338me]

it is a constant whine that never stops. no, as far as i know all the bushes are standard.

[hijacka]

 r338me said:

could it be a bad center differential bearing from welding it? or something just coincidentally wore out? thanks for any help in advance

Thats exactly what it is, Combination of weld splatter getting in to the bearing and excess load, they are not designed for rwd application that roller bearing on the centre diff is not going last either way.

If your in chch i can fix it for you.

[ADIKT]

You fucked with an RA gearbox? Shame on you

[nickch]

 loner said:

is it a clean and constant whine, or more of an intermittent rumble? Does it do it more when decelerating? do

you have hard gearbox or rear diff bushes?

loving the whine with hard rear diff bushes..