US-Gear 12-bolt pro gear issues ???

Kevin Panzino · 09-22-2024, 05:49 PM

Again, thank you all very much for the replies. Going through my records over the years, I have had from .023 to .032 pinion shim, and in the beginning I didn't even measure pinion depth, I just started with a .020 and focused on pattern and went from there. So I tend to think my .032" is not likely in left field. I do believe I got myself crossed up though with the cheap Proform tool that had my depth off by .008" compared to a ground flat bar, and a depth mic which is what I just did this time to look into it further, (albeit using the cap face as Centerline, which I still have to look into and understand.)

But I have good preload on pinion and carrier, I have a good looking drive paste pattern, and .008" backlash. So the axles are going back in and its all get buttoned up to run the Dutch.
I do think I will be ordering a Richmond set to put in over the winter however. It will be very interesting to see how that set is with essentially the same setup values.

I must admit, I am still somewhat wondering if my housing has had some warpage/movement over the years, because I will say I always have had a loud coastdown after clicking it into clean neutral. Its just that with this set, it is crazy loud, and I really got concerned when I could feel individual vibration pulses as it coasted to a stop, and as I gravity rolled down the staging lanes at the grove last week..

Thanks again to everyone. This forum is a blessing. Googling this kind of detail gets you pages of some guy on a Chevelle or Camaro street forum talking about how great so and so company is that he bought his entire rear-end from...

Kp

09-22-2024, 05:49 PM	#7
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 576 Likes: 298 Liked 748 Times in 137 Posts	Re: US-Gear 12-bolt pro gear issues ??? Again, thank you all very much for the replies. Going through my records over the years, I have had from .023 to .032 pinion shim, and in the beginning I didn't even measure pinion depth, I just started with a .020 and focused on pattern and went from there. So I tend to think my .032" is not likely in left field. I do believe I got myself crossed up though with the cheap Proform tool that had my depth off by .008" compared to a ground flat bar, and a depth mic which is what I just did this time to look into it further, (albeit using the cap face as Centerline, which I still have to look into and understand.) But I have good preload on pinion and carrier, I have a good looking drive paste pattern, and .008" backlash. So the axles are going back in and its all get buttoned up to run the Dutch. I do think I will be ordering a Richmond set to put in over the winter however. It will be very interesting to see how that set is with essentially the same setup values. I must admit, I am still somewhat wondering if my housing has had some warpage/movement over the years, because I will say I always have had a loud coastdown after clicking it into clean neutral. Its just that with this set, it is crazy loud, and I really got concerned when I could feel individual vibration pulses as it coasted to a stop, and as I gravity rolled down the staging lanes at the grove last week.. Thanks again to everyone. This forum is a blessing. Googling this kind of detail gets you pages of some guy on a Chevelle or Camaro street forum talking about how great so and so company is that he bought his entire rear-end from... Kp Last edited by Kevin Panzino; 09-22-2024 at 05:53 PM.