So I finally have competely taken apart my old tranny outa my r and assesed the damages. One day coming out of a parking lot one at like 30-40mph I hear a loud pop and i think i just broke a axel so I park the car and look underneath the car and see nothing wrong, everything was fine, but the car was not drivable so i got it towed. When i cracked the case on the tranny I notice lots of metal shavings everywhere inside the tranny, then i notice the bearing on top of the counter shaft. It was pretty much in peices just sitting there. Who ever had my car before me had a 4.9 fd installed and im pretty sure they reused the old thrust shim which let the main and countershafts "walk" side to side in the tranny. Im pretty sure this is why the bearing went to hell. Has anybody else have this happen to there tranny before?
So now gotta replace the bearings and get rid of all those metal shavings.

Well at least now i can put some gear-speed sychros in.




whats left of the bearing


metal shavings!


damage to diff bearing from chunks of the countershaft bearing

 

erm.

were you able to find the used thrust shim in there?

i dont see it in the picture.

 

Are you gonna replace the diff or leave it be? Sorry to hear what happened. The way I look at it is if I'm already inside the trans, why not replace what I can ie. bearings, syncro's. Why do things half *** when your already there?

 

yea im gonna replace pretty much all the bearings and the synchros and anything else thats out of spec, the diff seems ok other than the bearings, so im goin to keep in there.

 

wow. wish i was still there to see all this in person. My final drive is going in this winter.
keep me posted Tim.

 

There is nothing wrong with reusing those shims - there is a shim on the input shaft and the diff, and since you dont change either of those when you do a FD install there's no reason to replace them.

Looks like the previous owner did the install wrong somehow.

 

The shim on the input shaft is just a spring washer and a washer, the shim i am talking about sits inside the tranmission housing where the mainshaft bearing sits on, you have to measure the clearance of the top of the mainshaft from the top of the clutch housing to get the right 72mm thrust shim, there are like 34 different part numbers for different shims depending on what the measurement is. It should be measured and replaced if the measurement is not the same as new anytime the mainshaft comes out of the tranny.

 

Yeah there is nothing wrong with re-using the shims, mine were reused before and i had no issues. The install definitely went wrong somewhere!

 

Someone probably damaged the bearing trying to remove it off the stock countershaft...either way, looks like you got a hold on things

 

Any pics of this shim? The only shim that I know of that he might have to mess with is the one for the diff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trc_R &raquo;</TD></TR><TR><TD CLASS="quote">The shim on the input shaft is just a spring washer and a washer, the shim i am talking about sits inside the tranmission housing where the mainshaft bearing sits on, </TD></TR></TABLE>

Mainshaft = Input shaft

When you install a FD ring gear/countershaft set, you dont mess with the input shaft so there is no reason not to reuse it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">Any pics of this shim? The only shim that I know of that he might have to mess with is the one for the diff. </TD></TR></TABLE>

Why wold you mess with the diff shim? You're not changing anything.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RJ &raquo;</TD></TR><TR><TD CLASS="quote">Why wold you mess with the diff shim? You're not changing anything..... </TD></TR></TABLE>

exactly, the diff/carrier bearings haven't changed, so you don't need to mess with the thrust shim.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trc_R &raquo;</TD></TR><TR><TD CLASS="quote">The shim on the input shaft is just a spring washer and a washer, the shim i am talking about sits inside the tranmission housing where the mainshaft bearing sits on, you have to measure the clearance of the top of the mainshaft from the top of the clutch housing to get the right 72mm thrust shim, there are like 34 different part numbers for different shims depending on what the measurement is. It should be measured and replaced if the measurement is not the same as new anytime the mainshaft comes out of the tranny.</TD></TR></TABLE>

you are talking about the thrust shim between the carrier bearing on the diff and the bellhousing, which has no contact with the input shaft or counter shaft. this would no be effected by installing a new FD.