Input shaft problems?
This is a discussion on Input shaft problems? within the Manual Transmission forums, part of the Drivetrain category; Has anyone ever had a problem with their input shaft destroying damn near every slave cylinder? on the 5th one ...
10-29-2012, 07:57 PM #1
Input shaft problems?
Has anyone ever had a problem with their input shaft destroying damn near every slave cylinder? on the 5th one since 2007. My trannny, clutch and slave cylinder all shit the bed in '07. Needless to say new tranny was installed and immediatley the next 2 slave cylinders installed (brand new) the slave cylinder throw out bearing "popped" I got it home and the tranny was removed yet again and a new clutch was installed.....car worked for 4 years and put 25k miles on the new tranny and then last year in 2011 the slave cylinder popped when i gunned it out of a autozone parking lot. Not only that but i believe i only had 15k miles on tranny when the 4th gear started popping out upon acceleration. fastforward again, and they replaced the slave cylinder 2 more times, and the same thing happened...slave cylinder popped. and they would pop maybe 1 to 2 miles down the road....the shop that originally pulled it said that the input shaft could be the reason why it kept destroying the slave cylinders....so any suggestions or ideas as to what it could be? or is it the input shaft? btw after removing it and inspecting the input shaft it had a little play in it. Also another note to add. The slave cylinder that did last for those 4 years and 25k miles was worn to hell on the inside before its detonation.
Last edited by RedFenix_68; 10-29-2012 at 08:17 PM.
10-30-2012, 04:00 AM #2
- Join Date
- Jun 2011
- Branchville, NJ
Silver & Blue
- 02 Camaro SS, 04 GTO
I do not believe you should have any play on the input shaft. I do not know what else to tell you. I had my T56 rebuilt last year and everything is fine except I forgot to do the drill mod. Good luck, I know someone on this site will have a better answer for you.My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 75k
10-30-2012, 07:40 AM #3
- Join Date
- Feb 2009
- Ugy Lower Corner of AL
Navy Blue Metallic
- 98 T/A Not Stock Anymore!
could need a shim on the slave.
10-30-2012, 09:32 AM #4
10-30-2012, 10:21 AM #5
Coming from my experiance from working with other type manual transmissions RWD and FWD.
The input shaft should'nt have any play up or down or side to side or in and out.
To me, it sounds like the pilot bearing is/was hammered which can let the clutch disk get clamped off center.
This can put a bind on the input shaft. Not good.
You can rebuild the trany over and over or replace it over and over, but if the pilot bearing gets over looked each time you're asking for trouble out of every trany you bolt up new or used.
The pilot bearing keeps the input shaft in line with the engines crank.
IMHO if you do deside to rebuild personally I'd be suspicious of your trany case integrity now especially at the input shaft bearing seats.
Just my .02
10-30-2012, 11:22 AM #6
Last edited by RedFenix_68; 10-30-2012 at 11:24 AM.
10-30-2012, 08:36 PM #7
The pilot bearing is pressed into the back of your crank shaft.
There is a nipple race at the very end of the input shaft before the splined portion.
This nipple goes into and rides on the pilot bearing within the crank.
Without it or if worn you can tear up a trany pretty quick especially under a load.
It looks like this:
And it goes into the back side of the crank shaft. You can see it here in the center of this LS crank that has the flywheel removed.
10-31-2012, 02:02 PM #8
10-31-2012, 04:27 PM #9
as far as rebuilding the t56 goes, I had mine rebuilt and honestly i wouldnt be afraid to do it now if it needs to happen again in the (distant) future. as long as the bearing are fine you can leave them on the shaft and this allows you to skip the end play adjustments. they really arent that complicated inside if you have the service manual and some basic know how.
10-31-2012, 04:38 PM #10
10-31-2012, 04:40 PM #11
this is why i called my car nightmare....seemed like every turn i was making or doing on this car was leading me down a dark alley....but at the time my lack of knowledge and know how were really my nightmare...not the car...but the name is sticking with her
- - - Updated - - -
this is why i will research my ass off from now on so i do not look stupid to myself or anyone else.
10-31-2012, 06:58 PM #12
As a personal preferance I have never reused an old pilot bearing or bushing.
That does'nt mean you can't just I do not.
I am not aware of the allowable input shaft play for the t56.
However, I can tell you personally, I don't install any manual trany with questionable input shaft side play, or any play for that matter.
For instance none of the old style 4 and 5 speeds I've installed had any input play, non of the 5 and 6 speeds on my bench now have any at all.
However they are brand new units not rebuilt.. I can only rock the shafts left to right between the gear pitch.
Again, I don't know what the allowable input shaft play specs are for the T-56 so it could be just fine.
The fact that you stated your throw out bearing is so heavily worn, and you have replaced a number of clutches and throw outs at such low mileage intervals makes me wonder about the cause and the input shaft play though.
Last edited by Smittro; 10-31-2012 at 07:07 PM.
10-31-2012, 08:24 PM #13
12-20-2012, 05:24 AM #14
well i have decided to walk down this road and tear apart the tranny im going to post up a forum about it..well i might but it looks like there are plenty on here. i have still been able to get the car up and pull the clutch and check the pilot bearing.
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