I have a friend who is asking about his 5 MT on decel you can feel a thumping sound in the steering wheel and it goes away on accel.. However the gearbox makes like a sound that's hard to describe that sounds like a bearing noise but not a whining sound but deeper but coming from the transmission box.

I have a friend who is asking about his 5 MT on decel you can feel a thumping sound in the steering wheel and it goes away on accel.. However the gearbox makes like a sound that's hard to describe that sounds like a bearing noise but not a whining sound but deeper but coming from the transmission box.

 

 

any work or damage done before this?

any work or damage done before this?

 

Not that I know of.. I don't know when he's last did a fluid change.

Most common problem on the MT is the main shaft roller bearing.

How many miles on this thing? Mine took the dirt nap at 190k. Got a FWD trans with ~190k that is about to go. Trans it replaced had ~225k and I can move the main shaft fore/aft far enough to engage 4th and 5th gear.

When the car is stopped with the transmission in neutral, foot off the clutch. Does it make the offending sound?

It sounds kind of like putting an egg beater in a box of rocks and putting it on low speed.

Among many of its problems, my old dual range did that.

Edited March 8, 201214 yr by 987687

mainshaft rear berring if noise gos away when clutch is pushed in [ berring is weak ]

When the car is stopped with the transmission in neutral, foot off the clutch. Does it make the offending sound?

It sounds kind of like putting an egg beater in a box of rocks and putting it on low speed.

Among many of its problems, my old dual range did that.

As far as I can remember it only happens in gear when the car is moving but not on the throttle and coasting.

 

mainshaft rear berring if noise gos away when clutch is pushed in [ berring is weak ]

 

 

I don't think it mattered how the clutch was as long as the car was coasting off throttle you would hear it but as soon as you got back on it stopped.. I will know for sure when I go back to see him on Saturday.

When it gets worse it'll do it stopped in neutral too... Unless it's a main bearing on the output shaft, but that's sorta unlikely.

Hmmm, what year and model is this car?

99 Forester S

Uh-oh... The center diff might be asploded. Or getting ready to.

http://www.ultimatesubaru.org/forum/showthread.php?t=128615&highlight=Transmission+squeal

well that's not good.. How much does just the case with the gears in weigh in at?

well i just picked a whole manual tranny for a 95 by myself and im not a big dude...... the whole thing is prolly a lil over 100 lbs ( drained of course)

I know the total weight is 125 Lb but I'm talking about with the transfer case off and about to be split.. seems like no more then like 50-80 Lb?

I would definitley look into the center diff before splitting the case. I didn't weigh mine when I took mine out but it is a managable weight unless you have an injury.

 

Problem with mine (02 outback 5mt) was the viscous coupler was going bad and the retainer band that holds it together started coming out, got into the two main gears in the center diff and broke some teeth. My theory is that in the midst of a torque bind, the retainer ring started to pop out and got caught in the gears breaking teeth and grinding up part of the retaining ring. All of this could have been found by disassembling the center diff. I tore down the trans too, just to be sure before I started buying expensive parts for it. The gears and bearings were fine in the trans.

The only thing that has to come off to inspect the center diff is the tail housing assembly. The transfer housing stays put. Trans doesn't even have to be removed from the car. The tail housing comes off then the center diff and transfer gears can be removed.

No clue when the front fluid was changed, and the rear prolly was never touched either.- barely a quart of fluid. While back there, look for tell tale oil seeping either out of the top breather vent or axle sides. Look at what’s left of the fluid- metal flake? All this to eliminate a possibility that fooled me twice into changing out two separate trans (same 90 leg) that I clearly heard the accel deccel howl growl up front. I just knew it was the “bad” used trannies I was buying. Yup, it was the rear diff transmitting its problems up to the front diff,- noise would go away/ change on turning a corner as well.