S4 NA GXL Transmission Dissection Photos
#1
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S4 NA GXL Transmission Dissection Photos
The short story is, I was driving an 88 gxl, everything was working fine. I stopped to make a left turn, put the car in neutral. When it was clear to turn, I attempted to put the car in 1st gear and the shifter would move freely without selecting any gear.
I swapped the transmission and took apart the broken one to see what went wrong. Here are the pictures.
I swapped the transmission and took apart the broken one to see what went wrong. Here are the pictures.
#4
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#6
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I don't know the names of all of the parts.
I found the selector on the end of the rod that the shifter controls broke clean off.
Half of one of the gear movers broke off.
At least one brass gear (synchro?) was broken.
It happened without any noise or feeling while the car was idling in neutral. Or it happened without me noticing shortly before I stopped.
I found the selector on the end of the rod that the shifter controls broke clean off.
Half of one of the gear movers broke off.
At least one brass gear (synchro?) was broken.
It happened without any noise or feeling while the car was idling in neutral. Or it happened without me noticing shortly before I stopped.
#7
Senior Member
Thread Starter
If you look closely at the shots (sorry I didn't get more, I had to take my gloves off each time), you can see 3 rods control semicircular pieces that just rest on top of 3 smooth silver cylinders. When you shift into a gear, the selector picks one of those rods and slides the cylinder either forward or backward to overlap with the gear. The brass synchro gear sits between the idle gears and the drive gears.
That's what I could gather from looking at it. This is the first time I've seen the inside of a transmission.
The gear mover that was broken only lost half of itself, the rest was still in place against the cylinder that moves. The broken half was floating around loosely inside.
That's what I could gather from looking at it. This is the first time I've seen the inside of a transmission.
The gear mover that was broken only lost half of itself, the rest was still in place against the cylinder that moves. The broken half was floating around loosely inside.
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#9
^^ pretty much.
Destruction in my honda DD. all thats outta the tranny. I pulled 50+ magnet tips of metal shavings. And they were super fine stuff too not large chunks like the 3 pieces in the first pic.
~TDR
Destruction in my honda DD. all thats outta the tranny. I pulled 50+ magnet tips of metal shavings. And they were super fine stuff too not large chunks like the 3 pieces in the first pic.
~TDR
#14
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Manual transmissions are actually pretty easy to rebuild once you are able to understand what it is you are looking at and how it all works.
Automatics on the other hand, a bit more complicating.
Automatics on the other hand, a bit more complicating.
#16
Lives on the Forum
Yeah, looks like a selector fork and a synchro got eaten...
Broke with no warning?
That's odd.
This is the kinda damage misshifting or speed shifting would do to the trans.
Maybe from previous owners?
The gears looks pretty clean with no damage...
-Ted
Broke with no warning?
That's odd.
This is the kinda damage misshifting or speed shifting would do to the trans.
Maybe from previous owners?
The gears looks pretty clean with no damage...
-Ted
#18
Rupanrx
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I would have no problem replacing all the soft parts and my tranny and even doing a rebuild video and a writeup but I don't have the cash or the time right now.
For now I can make a photo of the powerflow for every gear if you guys want to understand more how it works.
it's not rocket science it's physics
all a tranny does is torque multiplication and torque division(and reverse).
ex. big gear driving a small gear means a lot of torque and low speed
a small gear driving a big gear means more speed less torque
For now I can make a photo of the powerflow for every gear if you guys want to understand more how it works.
it's not rocket science it's physics
all a tranny does is torque multiplication and torque division(and reverse).
ex. big gear driving a small gear means a lot of torque and low speed
a small gear driving a big gear means more speed less torque
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