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  #1  
Old 02-28-2008, 04:03 PM
6.5 Detroit Diesel's Avatar
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Default NV4500 Tranny Trouble

Okay, seems like one thing after another right now. I have my Dad's 95'
6.5TD needing a new TC, doing a tranny swap on my brothers Jimmy, (700-R4), and now my own truck tranny is acting up. Here are the symptoms.

Goes into gear okay when engine not running.
When running, have to basically jam it into Lo or first gear. When driving won't downshift unless you really shove it. Won't drop into second at all.
I used to always start off in 1st. Now, unless I start in lo, it will crowhop a bit as soon as the clutch engages. Going through a drive-thru, it wouldn't come out of gear at first. When the clutch is in and it is acting sticky, I hear what sounds like a whirring noise. Reminds me of the noise a forklifts hydraulics make when the load is to heavy to lift.

The clutch reservoir has plenty of fluid, but the level barely changes at all when the clutch is pushed in.
The clutch, (and flywheel), are still rather new. Just over 20,000 miles on them. The truck has never been used for loads over 8,0000 lbs. Any ideas as to what this could be?
Aggravating to say the least as I also have roofing jobs to get to!
Thanks
Ben
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #2  
Old 02-28-2008, 07:30 PM
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Default

Have you checked the trans to bell housing bolts to see if they are getting loose?

Other than that it could be a failin master or slave cylinder. Did you bleed the slave? Allen screw on top just ahead of where the line comes in.
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2006 K3500 D/A
94 6.5 4x4 5spd Sold
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  #3  
Old 02-29-2008, 12:29 PM
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Default Tranny

I will be checking it out. Thanks! Any other suggestions.
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #4  
Old 02-29-2008, 04:19 PM
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Default Tranny

Okay, so I disconnected the hose that runs up to the reservoir and plugged the bottom of the reservoir. I then filled up the reservoir with new fluid and tried the clutch. Basically no resistance, the clutch goes straight to the floor. So I am figuring that that is the problem, the master clutch cylinder. New one here and ready to go in! Also got a new slave cylinder as well as I am sure the old one needs to be replaced anyways. Hope that is the problem, though I can't see what else it could be!
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #5  
Old 02-29-2008, 06:51 PM
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dood, you shoulda called me up--I've got a brand spanking GM master cylinder in the box that I found in the back of that red and black truck I parted out . . . oh well.

Don't wreck your tranny :-)
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1982 GMC Sierra Grande Camper Special
6.5TD: ARP head studs, DSG girdle kit, DB2 turned up 1/8th, '97 Cummins intercooler, custom 3" downpipe to 4" straight exhaust, wastegate @12psi, boost and pyrometer, NV4500 with mech. clutch, twin-sticked NP205, D60 front/D70HD DRW with 4.10 gears, '93 serpentine belt setup
in progress

1997 Chev Express G3500
6.5TD 15 passenger van
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  #6  
Old 02-29-2008, 11:25 PM
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Default Tranny

Nice dood. I had known back when I was out there that this was going to happen, we could have avoided it, eh? Oh well, sure you will find use in your tranny swaps. I gotta get the truck back together tomorrow though.
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #7  
Old 03-01-2008, 03:44 PM
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Default Master Clutch

New master clutch in. Put half a liter of fluid through trying to bleed out the stupid line. Still won't go in when running. If you jam it in, sounds like it is making light contact with the plates. Clutch won't stiffen up. Removed the inspection bolt and found that the fork moves around half an inch with pedal fully engaged. ?????????
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #8  
Old 03-01-2008, 08:09 PM
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Default

Could be the pivot ball has gone away at the clutch fork. I've seen them wear clear through the fork. Sounds like time to pull the trans and check deeper. When moving the clutch line don't put any stress on it. DISCONECT AT BOTH ENDS before moving things around.
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2006 K3500 D/A
94 6.5 4x4 5spd Sold
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  #9  
Old 03-01-2008, 09:44 PM
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Default Tranny

Yea, sounds like it is time to move in. Did some research and found some people have had the fork actually bend after a while. Not sure how much of a possibility this could be though.
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #10  
Old 03-04-2008, 05:17 PM
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Default Problem?

Pulled the trans yesterday. Was to dark to see much so had to wait until today to get in close. The bellhousing is still attached to the block. I removed the throwout fork, bearing, and stud. The fork is cracked around the stud hole. The bearing is rather noisy. And the stud is worn down around the contact point. Also, there is apparently a keeper and a seat that go on the end of the stud that were no where in site. Anyone ever seen this before? Would the worn stud and missing seat cause it not to go into gear? I have pics.....
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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