Cascade Crew

aaron_sK · Posted: Mon Aug 06, 2007 7:45 pm Post subject: T56 sticking?

Took the IROC out for a little test drive blast around the neighborhood. Shifted through and hit 4th, then hit the brakes and came to a stop (still in fourth). Went to pull it into first and the shifter was stuck. Killed the engine, and stepped on the clutch a few times, then jammed the clutch and pressed (hard) on the shifter to pop it back out.

After that it seemed a little stiff through all the gears, so I ran the pattern a few times and it works fine now.

Is that just a fluke from me shifting it hard after sitting for three weeks, or is it a potential problem?

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

Make sure there's no air in the lines for your slave cylinder. Could also be a weak pressure plate, but I doubt it.

Demon · Posted: Tue Aug 07, 2007 1:44 pm Post subject:

from what I've been told, that was a common problem with T56's from 93-95 or 96ish even though the 93's had slightly different gearing inside them, the following few years had similar problems ...

other than that, it's not really normal from what I've experienced... could be a heat issue, or it could have been something jammed in the synchro's that got knocked loose again after it was worked through a few times... never know

aaron_sK · Posted: Tue Aug 07, 2007 5:59 pm Post subject:

Sellman -- Correct me if I'm wrong, but since it's an LT1 clutch wouldn't a pressure plate problem cause it to disengage?

Demon - It's a 1996 trans to the best of my knowledge. Could it be a lack of fluid distribution since it had been sitting?

Demon · Posted: Tue Aug 07, 2007 9:31 pm Post subject:

aaron_sK · Posted: Tue Aug 07, 2007 9:35 pm Post subject:

Well, the fluid has about fifteen miles on it. Embarassed

It probably wouldn't hurt to check and make sure it didn't leak a little while sitting though.

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

[quote="aaron_sK"]Sellman -- Correct me if I'm wrong, but since it's an LT1 clutch wouldn't a pressure plate problem cause it to disengage?

quote]

Well, I'm unsure about LT1 specific stuff, but (as I understand it atleast) the pressure plate keeps pressure on the clutch, keeping it engaged against the flywheel when the pedal is released and returning the pedal after pushed down. If the pressure plate teeth (where the TO bearing meets it) where weak they would flex just the teeth, as opposed to releasing the clutch. I've only seen that once in a 95 truck, most the teeth had been knocked out (how, I have no idea), and the clutch did all sorts of funky weird stuff, not to mention the noise of the teeth rattling around in there.

Again, I dont know if LT1's have the clutch system different or not though, and as I said, I doubt if it actually is a pressure plate problem. If it hasnt done it since, consider it a fluke, jot it down and hope it doesnt happen again lol.

Twilightoptics · Posted: Wed Aug 08, 2007 1:07 pm Post subject:

[quote="Sellmanb"]

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

[quote="Twilightoptics"]

aaron_sK · Posted: Thu Aug 09, 2007 6:36 am Post subject:

It's actually harder to describe than it is to work on. Laughing

Once you get under there it's easy to install.

aaron_sK · Posted: Thu Aug 09, 2007 12:16 pm Post subject:

Drove it again today. Fourth is working fine, but it was occasionally popping out of third when I let the clutch out, after I first started it up. Driving back from Lakewood (yes, I failed emissions AGAIN), third was working fine. Confused

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

OK, I'm on gmdealerworld, for the original complaint of it not going into 1st, I have the diagnostic trouble "tree" for transmission will not go into one gear:

Transmission Does Not Shift into One Gear
Step
Action
Value
Yes
No

DEFINITION:

The transmission does not shift into one gear.

1

Remove the transmission.

Refer to Transmission Removal or to Transmission Removal .

Check for worn or damaged gearshift components.

Are the gearshift components OK?
--
YES Go to Step 2
NO Go to Step 3

2
Disassemble the transmission.

Refer to Transmission Disassemble or to Transmission Disassemble .

Look for worn or damaged synchronizer assemblies.

Replace all worn or damaged parts.
--
--
--

3
Replace the worn or damaged gearshift components.

Refer to Transmission Disassemble or to Transmission Disassemble .

Will the transmission shift gears?
--
YES System OK
NO Go to Step 2

for second complaint of it jumping out of gear, I'm in the diagnostic trouble tree for "transmission jumps out of gear"

1
Check for low oil level in the transmission. Refer to Transmission Fluid Inspection or to Transmission Fluid Inspection .

Is the oil level OK?
--
YES Go to Step 2
NO Go to Step 3

2
Check the transmission for improper lubricant. Refer to Lubrication Specifications .

Is the recommended lubricant being used?
--
YES Go to Step 5
NO Go to Step 4

3
Replenish the oil to the level of the oil fill plug.
--
--
--

4
Drain and refill the transmission with the recommended lubricant.
--
--
--

5
Check for loose clutch housing bolts. Refer to Fastener Tightening Specifications .

Are the bolts tightened to specifications?
--
YES Go to Step 6
NO Go to Step 7

6
Remove the transmission. Refer to Transmission Removal or to Transmission Removal .
Disassemble the transmission. Refer to Transmission Disassemble or to Transmission Disassemble .
Look for the following list of causes:
Gearshift components are worn or damaged.
Transmission gears are worn or damaged.
Bearing components are worn or damaged.
Replace all worn or damaged parts.
--
--
--

7
Tighten the clutch housing bolts to the specified torque.
--
--
--

The one thing both of those have in common are gearshift components worn/damaged. And it seems like in order to check that you have to tear into the transmission. I hope this helps a little?