In case no one has noticed..

There are very few issues with the Allison.

I mean... it's just about dead quiet on Allison problems.Edited by: hoot

I had one this weekend with burnt up C2 and C3's... Only had 11k on it too! Manufacture defect? nope, too many boxeshttp://www.dieselplace.com/forum/smileys/HiHi.gif


Its fixed up now with a big ol purple convertor and a few non stock parts in ithttp://www.dieselplace.com/forum/smileys/Wink.gif

I have one that will be on the ground for me tommorrow morning with no C3 clutch apply. The fluid looks good though.





But you're right Hoot, I don't see many problems with Allisons. Just NSBU switches.Edited by: GMCSID

Mine will be dead in a few more weeks,http://dieselplace.com/forum/smileys/Big%20Smile.gifhttp://dieselplace.com/forum/smileys/Big%20Smile.gifhttp://dieselplace.com/forum/smileys/Big%20Smile.gifhttp://dieselplace.com/forum/smileys/Big%20Smile.gif although so-far, I havn't been able to get it to slip. At least not enough to Zing or Limp.

Eric, you have another one in the shop that has a shot tq converter and I'm sure the clutches are burnt!

I posted problems on here earlier about my tranny going into limp mode (NSBU switch).


I had it happen again, and while they were changing the NSBU, they checked the oil and it was badly burnt again. ONLY 1000 KMS AFTER THE LAST CHANGE/FLUSH!! Thats with normal driving-no towing.


I should hear the verdict tomorrow.

I was planning to change my spin on allison filter. Will there be a lot of oil comming out or will it just be the oil in the filter I will loose??. Will the oil keeping draining out with the filter off??

I was planning to change my spin on allison filter. Will there be a lot of oil comming out or will it just be the oil in the filter I will loose??. Will the oil keeping draining out with the filter off??





You will loose a bit of oil as well. Maybe 1/2 quart? Probably not even that much.

just got my truck back today -- 51,000 miles -- new nsbu switch -- cost me $342.52 at the chevy dealer

my friend got his back -- 58,000 miles -- new nsbu switch -- $400.00 including the tow bill

There must be a problem out there and Allison is not taking responsibility for this part failure!!!

$340 to $400 beans for an NSBU switch!!!http://www.dieselplace.com/forum/smileys/Wacko.gif I know that includes the install but man that's nuts!

OK I am missing something here..


Is the NSBU switch not a warranty item?

OK I am missing something here..


Is the NSBU switch not a warranty item?








Not after 3/36

Changing the Allison spin on yields about a pint ....


They are some pricy NSBU switch replacements at the dealer .... I've heard just over a couple hundred bucks .... Even at that it's pricy for an hours labor plus part ....


Mac

dealer says warranty only covers internal transmission problems -- external switches, electrical -- not covered!!


Since Allison revised this part and made some changes -- I think it should be covered -- at least 50%

I just replaced my NSBU last week, this is not a difficult task, took me about 1/2 hour crawling in the snow/mud.


Buy the switch at the Allison dealer NOT the local GM Dealer.


NSBU cost @ Allison Dealer - $ 47.00


NSBU cost @ GM Dealer - $159.00

what the heck is a nsbu switch

Anyone have a pic where this switch is located?





Also who/where is a good allison dealer to buy a new switch?

Anyone have a pic where this switch is located?





Also who/where is a good allison dealer to buy a new switch?





Do a search in this forum, there are a few threads w/pics. Switch is on drivers side of transmission.


Go to Allisontransmissions.com, there is a dealer locator on the site.

what the heck is a nsbu switch


Neutral Safety Back Up switch.

Again, anytime you are over 36K (out of warranty) and need Allison work take it to an Allison dealer (unless you live in Michigan and you already know where to take it).

Again, anytime you are over 36K (out of warranty) and need Allison work take it to an Allison dealer (unless you live in Michigan and you already know where to take it).








I dont mean to ask a stupid question, but where in MI?http://www.dieselplace.com/forum/smileys/Confused.gif

Anyone have a pic where this switch is located?





Also who/where is a good allison dealer to buy a new switch?

The black unit with the lever and wire harnesses attached.

http://www.uscom.com/~hoot/cars/duramax/gmc/allison/allisunder.jpg

When I changed the oil (dropped the pan and cleaned it, minor build up on the internal magnet) at 16,000 and changed the spin on filter (2nd time), I noticed the tan NBSU. Next stop was at Mr Goodwrench. With the TSB in hand I told them that I spend far too much time in the back country crossing rivers and creeks and mud holes to be worried about a failure so far from home. Also reminded them that the tow bill from BFE was on the General, and I have noticed that the ONSTAR unit seems to work about everywhere. I also reminded them that I have the GM extended warranty. Zip, Zap, Zowie part replaced. Nice to have the upper hand now and then!


And thanks to places like this and the 'other diesel site', I always visit with knowledge & they always treat me with respect.

Oh Yea, back to Hoot's original comment, in the 3 years that I have been monitoring the original diesel page and this one, there are so few Allison issues, it just confirmed my conviction that this drivetrain is the best matchup going! My 13 years in the oil patch working around pulling units and Halliburton and Dowell and others, I was convinced that if Allison ever got into pickups, I will have one.


They did and I did.

Again, anytime you are over 36K (out of warranty) and need Allison work take it to an Allison dealer (unless you live in Michigan and you already know where to take it).








I dont mean to ask a stupid question, but where in MI?http://www.dieselplace.com/forum/smileys/Confused.gif





dmaxalliTech


GM/ASE Master Certified Mechanic


Grand Rapids, MI

what does the switch do?

what does the switch do?


Alot. The switch tells the computer which gear you have selected so it know what commands to give the Ally. Once the shift lever goes beyond D position, the manual valve no longer moves (this means the linkage is only moving NSBU switch contacts) and the rest is smoke and mirrors. Example; if the NSBU switch is defective, computer may think Ally is in nuetral. It will not give any commands to shift, it may not give any commands to move.

The tan switch is the replacement for the black switch. The tan switch has a bit of additional shielding from the elements around the selector shaft. It's the tan switch that you want to have installed if you have to have one replaced.