Hi All, I've been getting some help on setting up my 9" over on hotrodders.com, but the guy says he can't read the pattern with Prussian blue. To my eyes, it's much more pronounced than the yellow paste that came with the gear set. Anyways, it's all I have to work with as the yellow stuff is gone. Any help on this would be appreciated, I'll prolly be having shoulder surgery soon and would like to get this finished and stored before that happens... Here are the latest two pix in case the link requires membership. Russ
it looks pretty good. whats your back lash. if its below 0.080 open it up to thats. if your at that or higher then leave it alone. the depth looks almost perfect. their may be a hint of it being deep but that is good with performance. it will deflect on to the face.
Looks good to me too. Bryant knows his stuff though. If you used the pinion shim that came with the case you're usually ok a good percentage of the time. That's not a rule though and it always should be checked. How did you measure your bearing preload?
Yukon says 0.006" to 0.010" and this one's at 0.008". The pinion face says 1.028" but that wasn't gonna happen. It would have been a shim stack of 0.064"! I ended up trying what was in the case originally (0.020") and that's what this pattern is from. Pinion preload is 12 in/lbs with a solid spacer, carrier bearing preload is...a lot, enough to add noticeable drag to the assembly. Prolly 2 "adjuster holes" past snug. After running out of paste, I scraped off as much as I could and mixed that with white lithium grease which left more of a smear instead of a pattern. I liked that I could paint 3 teeth with the Prussian and after 5 or 6 turns, all teeth were covered evenly.
I'm definitely not an expert like Bryant but I've used Prussian blue before and it worked fine for me. Just like you I coated a few teeth and let it spread.
oops that was a typo. 0.008 is what i meant their are several factors that need to be considered when setting pinion bearing preload. are the bearings new or used and are they dry, coated in oil, or grease. i set the preload with a sticky bearing grease. new bearings get 22 inch lbs and used bearings get 15 inch lbs. never do it dry. with oil you need to lower the rolling resistance. the numbers on the end of the pinion head are for pinion depth. it takes a special tool to measure it. setting the depth off of pattern is just fine.
Not everyone has a pinion depth tool. And even if you use one you have to check the pattern anyway...
Thanks, guys! Pinion bearings are new and oiled. I struggled a bit with this, just a 0.001" shim change went from 42# to 0# so I ended up turning off a few 10 thousands in my lathe to end up at 12#. Whenever my shoulder gets a little strength back, I'll button it up for storage. MRI results should be back today or tomorrow, then I can get this business scheduled. I'd rather be laid up over the summer when it's too hot to work than waste good fall & winter weather!
Good information I got my 9 inch back from the speed shop late last year but have yet to unwrap it from the plastic. They changed my 3.55 to 3.89 and put everything new in it. Since seeing your pattern, I think I'll have a look at mine tonight. I should be able to see their paint on the teeth.
