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I am currently building a 9" for my truck, but the problem is that the proper pinion depth cannot be achieved. The pinion does not go deep enough into the case for a proper gear pattern. This is what I have...
1. Small bearing 2.890 N case aftermarket from a Nascar vehicle. Center line at saddle 1.441
2. Daytona pinion support, using a solid spacer and no shims. Yoke torqued 200 ft lb, preload at 22" lbs no seal. Actual pinion depth measured from the saddle is 1.0175"
3. Richmond helical gear carrier, new.
4. Richmond 3:50 gear set low mileage very good condition.
5. Ring gear backlash is .0009 to .0012
Drive side pattern at toe. Coast side pattern at heel. The pattern on my set up matches pretty close to the second pattern set in this diagram. I have no pinion shims to remove to correct this pattern. I have an idea to correct it and short of replacing parts IE case, gears and or pinion support. Remove and shim the inner pinion bearing away from the gear to increase pinion depth.
Maybe any members here have had this problem??
You might be getting a "False Deep" pattern. I have never had one that didn't take a shim. The only way for that to happen is grossly mis-machined parts.
Try a standard thickness pinion shim and see where it ends up with backlash in normal range (.006 to .010")
.0009 to .00012" is way too tight for a street vehicle. I used to set race gears up as tight as I could with no tight spots, but we didn't care about noise.
If it won't go deep enough with the solid spacer.
The spacer maybe needs to be chucked up in a lathe and face cut?
Rinse and repeat until you get it to the depth you need.
I agree with Mikey that's way too tight. Shop manual says .008-.012 with max .003 variation between teeth. Tell us that isn't rust on those ring gear teeth!
If it won't go deep enough with the solid spacer.
The spacer maybe needs to be chucked up in a lathe and face cut?
Rinse and repeat until you get it to the depth you need.
The spacer Lizard refers to is the pinion bearing spacer, which goes between the two major pinion bearings and determines pinion bearing preload. Used instead of a crush sleeve. A pain to set up, but once done, it can be repeatably disassembled without buying a new crush sleeve. Has nothing to do with pinion depth.
I agree with Mikey that's way too tight. Shop manual says .008-.012 with max .003 variation between teeth. Tell us that isn't rust on those ring gear teeth!
No sir, that is grease I tried for a pattern with no success, there is no rust on this gear set. .335 shim .008 backlash DRIVE .335 shim .008 backlash COAST
Mikey, .290 shim .009 backlash. DRIVE Coast .290 shim .009 backlash
I tried a .290 shim and got this pattern. Tomorrow I will try a .250 shim and that should bring the DRIVE and COAST patterns closer to center. I also want to widen the backlash to .10-.013. I will post tomorrows results. Thanks a bunch for your suggestions guys.
Yup that's what I meant. Forgot the 0 in the shim #'s. I should have this wrapped up tomorrow and get it installed by end of next week. I will have the patterns posted by tomorrow. Thanks again Mikey!!
Yup that's what I meant. Forgot the 0 in the shim #'s. I should have this wrapped up tomorrow and get it installed by end of next week. I will have the patterns posted by tomorrow. Thanks again Mikey!!
Glad to help.
You'll get it. Sometimes it can be tedious.
One of the rules I Iive by..
I've learned far more from the mistakes I've made or doing it wrong than I ever have from getting it right the the first time. And brother, I've learned a BUNCH in my time!
