Noise in 4 wheel Drive
02-02-2017, 06:48 AM
#11
Registered
I was hoping to learn that from the VIN number but so far I haven't been able to get the information-- I'm stopping by a GMC dealer tonight. It's a GMC 2004 Durmax 2500 club cab short bed- white with gray leather. Lord willing I'll test drive it Saturday and maybe drive it home Saturday afternoon. Do the designations that you reference LLY or LBZ have anything to do with the Transmission?
thanks
3pointstar
thanks
3pointstar
02-02-2017, 09:32 AM
#12
Registered
Which is more desirable, and for what reasons? Thanks.
02-02-2017, 10:08 AM
#14
VIP Member
It's called "pump rub". There was at least one TSB about them.
https://www.google.com/webhp?sourcei...q=pump+rub+tsb
There is a fix kit for it.
Basically, the oil pump inside the transfer case rubs the casing, eventually causing a hole. The transfer case fluid drains out, and blows the transfer case.
02-02-2017, 10:10 AM
#15
Registered
I think opinions will vary. The knock on the LB7's was if the injectors leaked, you had diesel in your crankcase. It has been quite a few years since I followed the diesel sites so I'm not sure if the newer generation injectors all but solved that issue. As stated above, the LLY's had issues with overheating. I personally never had an overheating problem with my LLY but I only towed 10K in pretty flat land. If you towed heavy and in any kind of elevation it was a problem. LLY's also had some injector problems but they would not put diesel in the oil like the LB7's would. VVT's can have their own set of issues. I think it comes down to how much you are going to tow and what level of power you desire. I ran both a 40 and 60 HP tune (Diablosport Predator) on my LLY with no other mods and it was plenty for my needs. In fact, I couldn't keep tires on it as it was also my daily driver so a lot of in town driving would just roast the right rear. I'd get just a little over 20K out of a set of tires rotated every 5K. IMO, the LBZ was the best engine as it solved a lot of the problems the LLY had and was pre-DPF. But those are hard to find and command a premium.
Last edited by Knot 4 Me; 02-02-2017 at 10:12 AM.
02-02-2017, 10:12 AM
#16
Registered
Correct. Another thing to look out for. There were also some wiring issues with LLY but the problem escapes me at the moment. A quick search on dieselplace.com would find all the major issues.
02-02-2017, 11:29 AM
#17
Registered
8th digit on the VIN will tell you the engine. (1) will be LB7 (2) will be an LLY.
If it is an LB7 here are some things to lookout for from my experience.
Change your fuel filter every single oil change. The injectors are way too sensitive on the LB7 engine and any little bit of dirt will trash them. To replace all of them is usually between $3000 to $4000. Fuel filters are much cheaper. Also, if the do go out, call GM they extended the warranty on these injectors to 7 years/200,000 miles and have been known to reimburse past that.
Pump rub in the transfer case is possible, you will have no idea if yours is an issue until it is too late or if you open it up and have a look.
If you start feeling like the transmission is not shifting right whenever you put it into gear, then look at replacing the Neutral Safety Back-up switch on the side of the transmission for $80. They can go bad.
If the O/D button does not work it is more than likely and broken wire in the column where the gear shifter pivots. This happened on mine.
Injector cups can fail. It will look a lot like the same symptoms as head gaskets which will pressurize your cooling system and puke coolant. This can be tested for if the issue does present itself.
If it is an LB7 here are some things to lookout for from my experience.
Change your fuel filter every single oil change. The injectors are way too sensitive on the LB7 engine and any little bit of dirt will trash them. To replace all of them is usually between $3000 to $4000. Fuel filters are much cheaper. Also, if the do go out, call GM they extended the warranty on these injectors to 7 years/200,000 miles and have been known to reimburse past that.
Pump rub in the transfer case is possible, you will have no idea if yours is an issue until it is too late or if you open it up and have a look.
If you start feeling like the transmission is not shifting right whenever you put it into gear, then look at replacing the Neutral Safety Back-up switch on the side of the transmission for $80. They can go bad.
If the O/D button does not work it is more than likely and broken wire in the column where the gear shifter pivots. This happened on mine.
Injector cups can fail. It will look a lot like the same symptoms as head gaskets which will pressurize your cooling system and puke coolant. This can be tested for if the issue does present itself.
02-02-2017, 01:39 PM
#18
Registered
Make sure you have it looked at up in the air before you buy 100%! As above they either need, or have had fuel lines and brake lines replaced. Metal retainers at the top of the tanks rot out and piss fuel. Cab corners, rocker panels, and lowers of the doors need a good inspection or it will cost you some coin! Love the trucks though, front seats are just as comfortable as a Lazyboy
02-02-2017, 07:52 PM
#19
Registered
Sydwayz - thank you so much - I feel like an idiot to some of these questions - an old fart is supposed to know this but I just don't have the experience. I hope this deal really goes thru - the truck looks like it came out of the box - it has 170k -- We have a couple of diesels - and to be honest they really don't get "really" going until after 100K. Our Benz E320 CDI 2006 has 135K and to be very honest at 125K it was like the car got hit with the fountain of youth -- fuel economy went up- which was great before, the get up and go is the best ever. down side it seems that I can't blow any smoke out the exhaust-- URGH
is there anything else that I should be looking at the trucks within a year or two
again thanks so much for your help
3pointstar
is there anything else that I should be looking at the trucks within a year or two
again thanks so much for your help
3pointstar
02-02-2017, 09:21 PM
#20
Registered
Thread Starter
[QUOTE=billpor930;4525487]Re. the Benz E320 CDI 2006
Fellow Benz owner -- yes, I can't brag enough about how it is running. It seems every time we go somewhere it gets better and better- I tease my wife and tell her -- they get this way right before they blow up! I'm really hoping that this GMC that I'll look at is everything the pics and documentation show -
only a couple more weeks till the boat splash season!!!
Be safe
3pointstar
Fellow Benz owner -- yes, I can't brag enough about how it is running. It seems every time we go somewhere it gets better and better- I tease my wife and tell her -- they get this way right before they blow up! I'm really hoping that this GMC that I'll look at is everything the pics and documentation show -
only a couple more weeks till the boat splash season!!!
Be safe
3pointstar
