AlxJ64
Rust is Paint
Has anyone ever had issues with gear clatter in an NP205 after about 15 miles or so of driving? I am chasing a noise and can't seem to pinpoint it. The NP205 in the truck was a well worn unit when it went in for rebuild so wondering if something internal is just worn out and after the fluid gets a little warm and a little displaced, if its making noise and not the transmission. - More details below for anyone who wants the in depth story and doesn't follow my thread in the other builds section.
I've been chasing a drivetrain noise in this truck for a while.
Its on the 3rd Allison 5 speed; the first one died in 250 miles because it was used and the converter I installed was sent with it and turns out it was trashed.
The next one was a donor out of an '01 Duramax that I swapped the SAE3 bell housing on to mate with the ISB170 Cummins.
That transmission did okay but seemed really noisy when it got warm. I figured it was a high mileage issue or something else. It was a $300 Allison to get me on the road until I had something built.
Last summer I had Grendel source and build me a really nice Allison 5 speed. I installed it last fall and was only able to put about 100 miles on the truck, in short trips at the time and this past year has just been other things in life, and on the truck so it sat. I just recently started driving it longer distances and the same exact noise is now apparent in this setup. Which makes me wonder if it is something else and not the transmission. Also, it shifts great, doesn't slip, doesn't shudder or do anything strange, its just the noise. The temps get up around 150 after cruising 75 mph on the interstate. The T-case is running cool though and I've only seen it like 110 one time in the testing.
So, different transmission with a known dyno test with fresh converter, cooling hoses and cooler, etc. all new. I changed the engine mounts, flattened the driveline angle, changed the transmission mount, sound deadened the front floors and transmission tunnel, but yet still the same noise is occurring and still at the same audible level and ONLY after the whole thing gets up to a warm temp or has been driven for a distance. Its nice and quiet for the first few miles.
This lends me to the question if its something else now; or if its the tune on the TCM. A few questions in an Allison FB group and they all say that its something else in the driveline of the truck.
Experiences with noisy 205s?
I've been chasing a drivetrain noise in this truck for a while.
Its on the 3rd Allison 5 speed; the first one died in 250 miles because it was used and the converter I installed was sent with it and turns out it was trashed.
The next one was a donor out of an '01 Duramax that I swapped the SAE3 bell housing on to mate with the ISB170 Cummins.
That transmission did okay but seemed really noisy when it got warm. I figured it was a high mileage issue or something else. It was a $300 Allison to get me on the road until I had something built.
Last summer I had Grendel source and build me a really nice Allison 5 speed. I installed it last fall and was only able to put about 100 miles on the truck, in short trips at the time and this past year has just been other things in life, and on the truck so it sat. I just recently started driving it longer distances and the same exact noise is now apparent in this setup. Which makes me wonder if it is something else and not the transmission. Also, it shifts great, doesn't slip, doesn't shudder or do anything strange, its just the noise. The temps get up around 150 after cruising 75 mph on the interstate. The T-case is running cool though and I've only seen it like 110 one time in the testing.
So, different transmission with a known dyno test with fresh converter, cooling hoses and cooler, etc. all new. I changed the engine mounts, flattened the driveline angle, changed the transmission mount, sound deadened the front floors and transmission tunnel, but yet still the same noise is occurring and still at the same audible level and ONLY after the whole thing gets up to a warm temp or has been driven for a distance. Its nice and quiet for the first few miles.
This lends me to the question if its something else now; or if its the tune on the TCM. A few questions in an Allison FB group and they all say that its something else in the driveline of the truck.
Experiences with noisy 205s?
