Last post on Oct 17, 2006 at 8:34 PM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, Truck
#915 of 1497 Transmission Problem
Dec 11, 2005 (5:31 am)
Sorry if this is a duplicate posting. I own a 1999 chevy silverado 1500 4x4. The other day I was driving approx. 55 mph and began to slow down to approx. 45 mph. When I went to accelerate back to 55, I felt a jerking in the truck. This has happened several times now but only when at higher speeds than like 45 mph. It feels like the truck is not downshifting out of overdrive when slowing down and then is jerking while trying to get back to speed. It feels like starting out in 3rd gear on a manual trans. Any suggestions on what the problem is. The truck has 73k miles on it and has never had a problem like this in the past. I have never changed the trans fluid either.
#916 of 1497 Manual trans noise
Dec 11, 2005 (10:06 pm)
I have a 2006 silverado 1500 work truck with a 4.8v8 and a 5spd trans, when I get going from a stop my truck makes a ton of trans noise, and when I push in the clutch it makes a weird double cluck noise, (clunk,clunk), and still has a whole lot of whining noise, could you please tell me this normal noise for a work truck, or am I going to see soon transmsition problems? Thanks
#917 of 1497 95 Silverado starting problems......
Dec 12, 2005 (7:20 pm)
I own a 95 Silverado with a 350 engine 145,xxx miles. It has been running great until last week. I got in one morning and it would not start. It has been real cold here in Illinois so I automatically thought it was the battery. but then I notice my lights and radio and all were working fine, plus when i would turn the key i could hear it hitting the starter. I went ahead and had the battery tested and it is fine (630 cold cranking if i remember right). The truck will not start on its own but if I use another car to jump it, it will start every time. Im not sure what to check next? Maybe the starter? If anyone has any ideas that could help please let me know.
#918 of 1497 Re: 95 Silverado starting problems...... [jesse_224]
Dec 13, 2005 (7:34 am)
Check you battery cable terminals. Sometimes corrosion occurs internally, so you do not see it. Also, check the battery cable connections to the starter (positive cable) and to the engine block (negative cable). You could have corroded or loose connctions there. You may want to consider replacing the battery cables at this stage. It is not that expensive and may solve your problem.
People tend to clean the cable terminals at the battery, but often forget the other cable ends, which are just as important. For example, if the negative battery cable connection to the engine block is loose or corroded, current will not flow properly and starter needs a lot of current.
#919 of 1497 Re: Manual trans noise [tmachines]
Dec 13, 2005 (6:52 pm)
I had the same truck (2003 Sierra 4.8, 5 speed 4x4) and the transmission made plenty of noise. Two GMC dealers said that the noise was 'normal' and that there was no way to fix it.
There is some info on the web (try searching for NV3500 gear rattle). You might also check Dodge forums as the NV3500 is/was used in the Dakota and 1500.
The NV3500 is the weak link in a 1/2 ton truck drivetrain (really a mid-size truck tranny, GM won't even install it in an extended cab 4x4). Look at the tow ratings with 5 speed vs auto. The 5 speed is ~2,000 lb less (limited to 10,000 lb CGVW, if I recall correctly). Perhaps if GM installed an adequate transmission, it might operate a little more smoothly.
#920 of 1497 Re: Manual trans noise [joe29001]
Dec 14, 2005 (7:46 am)
This explains why they did not offer a manual transmission in trucks with 5.3 liter engines. Incidentally, not long ago I saw a customized new Silverado truck with a 5 speed manual and supercharged 4.8 liter engine for sale on eBay. This was being sold by a GM dealer with full factory warranty. I wonder if they beefed up the transmission to match the 350+ HP output of the engine? If not, this truck will be a major diapointment for the new owner.
Why don't they just use a heavy duty manual 6 speed transmission that they use in the 2500 series, in the half ton version? The 6.0, 8.1, and Duramax engine trucks are all available with heavy duty 6 speed manual tranmsisions (and I assume heavy duty clutch too). The clutch is typically the weak link that limits the tow rating capacity with a manual tranmission. The best manual transmission in a pickup truck IMO is the Dodge Cummins pickup 6 speed manual. This Getrag tranmsission is supposedly also used in larger commercial trucks and the tow rating is something like 13,000 lbs.
#921 of 1497 A/C and heat won't blow
Dec 14, 2005 (8:13 am)
We have a 98 Silverado. Back in the summer, the A/C blower began working intermittently. Sometimes, the fan/blower would work at all settings. Other times, it would only work on high. Sometimes, it wouldn't work at all at any setting and then would kick in after we drove for awhile. The same thing is happening with the heater now, which had been working fine all fall. After the truck is warmed up, it radiates heat, but the blower isn't forcing any kind of air out of the vents at any setting.
#922 of 1497 Re: A/C and heat won't blow [cchild03]
Dec 14, 2005 (9:18 am)
It might be the blower motor resistor. I have a 2000 Silv and my blower began only working on level 3 & higher. There is a plug in resistor in the motor housing underneath the dash on the passenger side. It was very easy to change and only costs about $15.00 for the part. Not sure with your 98 if it's exactly the same but my guess is that it's at least similar. The resistor solved my problem and now the blower works on all settings.
#923 of 1497 Re: Manual trans noise [p100]
Dec 14, 2005 (5:33 pm)
The 5 speed isn't offered with a 5.3 because it can't handle the torque. The NV3500 is rated for 300 ft-lb (the 5.3 produces 335 and the 4.8 produces 295). Supercharging a 4.8L/NV3500 seems like a bad idea that would definitely void the transmission warranty. Maybe they installed an upgraded transmission (NV4500?), hopefully so.
It's unfortunate that GM uses a transmission unfit for the power or CGVW of a well-equipped truck. Let's hope they address this in the 2007 redesign.
It's clear why the weak NV3500 is only available on small-motor, regular cab trucks, but (somewhat off-topic) Can someone please explain why they don't offer a plow-prep package on 1/2 ton, extended cab models?
#924 of 1497 Hard shift
Dec 14, 2005 (6:37 pm)
2002 Silverado 1500, 4x4, auto transmission, 4.8L engine.
Most of the time the shift from low to second is very hard. Very seldom the shift is so smooth you almost can't feel it. Harder acceleration will usually make the shift smoother but no guarantee. Hauling a load will usually give a smoother shift. I've tried for 40,000 miles to learn the "trick" for getting a smooth shift but can't figure it out. As usual the dealer service department does not have a clue. Anybody got any ideas on how to make this transmission shift smoothly?