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Old 08-23-2012, 09:25 PM
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454, what turns your crank?
 

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T56 6 Speed wont go into gear

Long time no post on here for me. Got a new problem to hit yall with. I got a buddy who has a 99 Trans Am with a very very healthy built LS1. Not sure of power output but the car runs high 10's. Anyway, he is starting to have some tranny issues. As stated its a T56 6 Speed and has had some work done inside to hold the power and clutch is a racing clutch. The problem is that it was having trouble going into first and shifting early in the morning on first start up, then after driving it shifts fine. THERE IS NO GRINDING ON SHIFTS! Just wanted to say again it does not grind when shifting it just doesn't like going into gear. Now today he called me and said that it wont go into reverses at all now, and when it is in gear and the clutch to the floor it wants to creep forward. Also he was having a soft pedal on start up and would go back to normal after driving a few miles. Now I am not failure with manuals at all and was thinking maybe the linkage is outa wack? Not sure what its like to have a clutch go out (I would think a lot of grinding) so I am really no help to him with this, so I am turning to you guys to see if someone might know what it could be. Thanks in advance.

Cory

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Old 08-24-2012, 02:45 AM
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If it is creeping with the clutch to the floor he has a clutch problem not a transmission problem. If adjusting the clutch does not help it will need to be replaced.

John L
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Old 08-24-2012, 07:05 AM
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454, what turns your crank?
 

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I knew the creeping problem was clutch related, I was stating it as a supplemental problem and to help aid suggestions of what it could be and if possibly the two problems were related to one another or if they are just two separate problems all together and fixing them would be done by two different means.
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Old 08-24-2012, 07:19 AM
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One of the old school tricks to see if a clutch is installed and adjusted properly is to try to shift in and out of reverse cleanly. Since its symptoms revolve around early start up/ drive issues; that particular problem is not the gearbox. Unless you had a shift interlock issue, but this would be CONSTANT. It could be improper or insufficient lubricant contribution to a 'notchy feel' but that doesn't sound like what you're describing.

Have him check his clutch and service the hydraulic setup. If he doesn't have it; he should look into the adjustable master cylinder setup by Joey @ Tick Performance in NC. If you go to the manual trans page on LS1Tech; its page after page of issues similar to this. A hallmark of the original GM design I suppose. The clutch system needs regular maintenance. If the car is continued to be driven with a shoddy clutch; he WILL hurt the gearbox.

Not knowing what shifter he has, he may want to back off all of the shifter stops, see if it exhibits any problems and if not, reset them. I highly doubt this is an issue, but its good to check them anyway

FYI: an FBody T56 ring kit (all the single/double cone synch rings, struts, springs and fork pads) will run you about 500 dollars. If it hasnt been done; he should also have the iron service replacement 3-4 fork (Tremec p/n TNEC0843) which is about 60 bucks.

If you guys want me to recommend a T56 specialist in your area, tell me where he's at and I'll see what I can do
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Old 08-24-2012, 07:40 AM
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Like John Long said. Clutch problem most likely. If the clutch plate is dragging then the pressure plate is still in contact with the clutch plate and gear changes will be hard as you describe. It could be because of damaged fulcrum springs,Throwout bearing disintergrated,or clutch slave or master linear travel issues preventing enough travel of the release fork. .
Al.
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Old 08-24-2012, 07:57 AM
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454, what turns your crank?
 

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Ok all of what you said makes total sense to me now. This car has a long history with me, i have known her for awhile and seen it change hands a few times. I know more about her than my other buddy who owns it now. At any rate the guy who built it used to drag race it down in Texas. He had just pulled out his monster LS7 that was in it and put in the mild built LS1 but didn't do anything to the tranny or clutch, so it would make sense that it could be starting to go out. Like I said I am an automatic guy so dealing with these manual issues is a little outa my range, I can work on them just can't diagnose them. We are over here in the Olympia area (just south of Seattle Washington) so f you know some one over here that is good with these trannys that would be awesome. I can do the clutch swap myself but it would take me longer than he could have the car outa commission.
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Old 08-24-2012, 08:29 AM
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No problem.

This guy isn't one of my customers (you're on the other side of the continent from me) but he comes highly recommended by the corvette/G8/GTO/CTSv tuner crowd.

I have no idea where Snohomish Wa is so forgive me.

You should talk to Ellis Groo at Speed Secrets. SSEFI.com is their website. I've heard his name for a few years, he was the late model trans guy for Kirkland Trans a few years back I believe. If he is too far away for you, they probably have the name of a guy in your neck of the woods.

Hey keep us posted on this will ya?
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Old 08-24-2012, 10:52 AM
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454, what turns your crank?
 

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That isn't too far from us at all. I wish this could have been something simple, but this is the name of the game. It really wouldn't surprise me that the clutch is going out either. Before the car had a monster LS7 and about 4 months ago the prior owner (who we also know very well) swaped it out for a mild built LS1 so that it could be more streetable but didn't do anything with the clutch or tranny. But I will report back when we figure out exactly what it is. Thanks for the help!
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Old 08-24-2012, 12:44 PM
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No problem; you may find that a simple hyd assembly flush, fill, readjust procedure will help but heres the rub: If the clutch is too worn, it may skew all your adjustments and you'll be back at it again. Definitely check the hyd fluid anyway. Without knowing the clutch and Hydraulics used on a detuned race car, I can't even give you help on the adjustment. I feel bad.

Ask Ellis if he can write down some service notes once he gets it dialed in. Maintaining the clutch should be easy after this for your buddy to do say twice a year or whatever.
PS let me know your guys experience with the shop, that way we can keep growing. Perhaps you can even point them to our board.

Nate
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Old 09-04-2012, 04:20 PM
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The "guy" chevy kid was referring to was me. Come to find out i over looked a tiny yet key detail. My master clutch resevior was bone dry ! I filled it up and pumped the preasure bake into my pedal and all is well again. I need to get it on a lift and do a full fluid flush before i store it for the winter, that is when ill empty refil and bleed all lines. Thanks for your response guys.
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Old 09-05-2012, 08:43 AM
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You're not the first guy to overlook that. Im a trans guy and I forgot to put fluid in a 4spd I was doing for my FATHER. We put it in at like midnight and didn't notice the howling until he put an exhaust system on the car (open headers cover up a lot of nagging noises). Any time it comes to fluids, I put a piece of blue painters tape on the aircleaner and on somewhere inside the car "No Fluids" When I R&R one of the fluids, I write it on my tape. LS1tech.com has a LOT of info on your HYD clutch setup. Most guys end up going to the adj. master cyl. eventually.
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Old 09-06-2012, 08:50 PM
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454, what turns your crank?
 

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I didn't even think of that either.. I was with everyone else in thinking the clutch was out, or something else crazy. Should start using the KISS method more often... (keep it simple stupid) lol
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Old 09-07-2012, 06:45 AM
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You might want to look into WHY it went dry. Was it because the previous owner never filled it, or do you have a leak somewhere. Glad you're back on track.
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Old 09-22-2012, 12:00 PM
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I think i have a slow leak somewhere. I have to get it on a lift and go over it ! Thanks im glad to be back to driving it.
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