Ford 9 inch gears are my nemesis. I have lost track of how many sets I have failed in my life. I do not think it is the fault of the diff assemblers. My data shows it is poor gear manufacturing. I attempt to use real Ford gears and they seem to be the quietest and most durable. Occasionally you will get a good aftermarket set of gears. I found out that most gear suppliers set up there tooling / gear grinding and let it run until it is way out of tolerance. So if you get an "Early" set they may be good and if you get one of the last ones they maybe bad.

US Gear is going to make some "Stealth Gear" that are suppose to be more to OE tolerances. My buddy has a set to test on how quite they using some "real" measuring equipment. (An actual engineering test).

I hope they are good and stay good. Our community needs a better solution than digging though junk yards to find usable old Ford gears to get a quite gear set.

Mark

Glad to see this. Thought it was just my set that is loud. It’s surviving for now but for how long I don’t know.

It is truly the luck of the draw. I went through 4 center sections from very good suppliers for Gunner, before I found a used set of gears on Craigslist. I found a retired Ford guy who had some used gears. For $150 bucks for the gear and $100 to set it up, I had a quite set of gears. I dropped off my perfect center section that I paid $2500 bucks for and he said "You got some nice parts here". He put in the used gear and - dead quite. I kept his phone number... lol

Once you get tuned in to the noise it will drive you crazy. I can't stand diff gear noise.

Mark

I was hoping you were going to give the magic bullet on Ford 9” gears. Mine isn’t loud but I can hear them.

Is there a reason everyone runs a 9 inch? The only benefit I see is the quick change of ratios if you want. You can build a 12 bolt that's pretty stout.

I'm not looking to start a fight, just looking for some more knowledge on the subject!

I did 9" as it was a DSE piece i found a deal on with quadralink brackets in it. And it will support the 1000+rwhp it can make on a regular basis.

I can't stand it either. We seem to have the most luck out of Yukon gears, but like you said, nothing beats a factory set for quiet.

I purchased a Currie Enterprises narrowed 9” for my DSE QLink application and selected their micro polish service ($150 option). My rear end is extremely quiet and I am very satisfied. I understand that GearFX also offers a similar service.

The noise isn't limited to 9" Fords. I had a 12 bolt Chev in my last Camaro that had the same issue. I had them replaced with a set of aftermarket gears (don't recall the brand, and it doesn't seem to matter). Had them set up by a local guy that was a GM driveline mechanic for over 40 years. He has done literally thousands of rear ends. They howled like mad. He shrugged his shoulders & said it's the gears. I could buy another set, but I'd likely have the same result. Same story Mark said...they make some good sets, and a bunch of bad ones. I spoke to every gear manufacturers' reps, and they all said they hear noise complaints all the time. This was 15 or so years ago.

I read somewhere many years ago 9" Fords were quieter because of the greater hypoid angle. Seems to make sense that the greater hypoid angle provides the opposite effect of straight cut gears, which are extremely noisy.

My current Camaro has a 9". I had a 60-70 mph neutral-load whine which drove me nuts. I finally decided to have John's (they advertise in the GG Gazette), build me a QUIET pumpkin.
I was told they have a testing vehicle that has microphone(s) mounted on the axle and speakers in the cab, so they can listen for gear noise like with a stethoscope. For a nominal extra fee, they will install your pumpkin, & drive it to make sure it is quiet before shipping. I thought that was no brainer. They also told me they keep track of gear supplier lot numbers, and when they get a noisy set, they log the lot# and black list that lot. This way, they have a pretty good idea of good & bad sets.
Well, my pumpkin was returned to me in late fall, and when I drove it, the gears seemed perfectly quiet. I only put maybe 20-30 mile on them before winter storage. The next spring, aflter driving maybe 50 miles, the howl was back. I called John, and he said this has been happening, he thinks it is related to heat treating. He said he is going crazy trying to get good gears from ANYBODY, but he would stand behind them & give me another rebuild. This time he wanted to put a 3.60 set in instead of the 3.50's I had because he said he had a known good lot. I agreed & he sent me a very quiet (so far) pumpkin. I have several hundred miles on this one, and so far, so good.

Sorry for the long winded reply.

Bill

Mark,

Just curious, what brands/types of gear oil have you tried ? Also, what weight gear oil?

I try to use non synthetic oil. 95w120 I think.


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Camaro LT5
 

More sheet metal Matic from Matt at Sled Alley]https://uploads.tapatalk-cdn.com/201...b73a32f81c.jpghttps://uploads.tapatalk-cdn.com/201...bf1e6d94b7.jpghttps://uploads.tapatalk-cdn.com/201...055c39da86.jpghttps://uploads.tapatalk-cdn.com/201...1677173712.jpghttps://uploads.tapatalk-cdn.com/201...77b8fb52aa.jpghttps://uploads.tapatalk-cdn.com/201...8b266ba714.jpghttps://uploads.tapatalk-cdn.com/201...8d818cc4c7.jpghttps://uploads.tapatalk-cdn.com/201...0f2c0331e6.jpg


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Amazing !!!!!!!!!!!!

Ahh! Another Stielow build on Lateral G! Does it get any better?

uuuhhhh,
NO
LOL

That's some attention to detail right there, quality work :thumbsup:

Seems Rick's should be making THREE fuel pump locations in their next build for Mark :poke:

I never thought about 3 pumps. That would be easier than the twin Hellcat set up I was planning.

Thanks

Mark

couldn't help myself

Twin Hellcat pumps is a LOT of fuel. I'm sure that LT5 will need it. Interested to read up more on the fueling on this setup as I'd be willing to modify my fuel system as it's the limitation of my current setup being twin CTS-V.

Looking at the numbers it looks like the hellcat puts out 40% MORE than the V at same pressure and voltage. And on top of that, looking at the flow chart for the pump it's flow doesn't drop off as fast with fuel pressure increase.

**EDIT**
Looking at the numbers, two pumps can support around 1700hp comfortably on E85:bow:

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The have the new QA1 shock and the new Holley LT5 accessory drive mocked up. The shocks are cool because the have big knobs for quick running. The other set up required removing the wheels. I look forward to testing them.

The new Holley LT5 accessory drive uses the GM LS9 power steering pump. The power steering pulley has its own large bearing to take the blower belt load. The power steering pulley is splined and inserts into the power steering pump.


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Have you run QA1 shocks before?

I have not. The parts look nice and I like the idea of driving to an open track day on soft shock calving. The cranking the shocks to a track set up.

The JRIs are great shocks but you need to pull a front wheel to adjust them.

I’ll find out next summer how they work.

Mark


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Sled Alley is timing up all the sheet metal. This always takes longer that I expect.


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What intercooler pump did you use this time or in the past? Also any need for a icebox or do you just typically run a factory supercharger reservoir?

WOW........that blower lid is up there! Is the plan your trademark cowl hood? Enjoying the build as always.

Mark, are you using any electronic traction control? If so, which system?

I am wondering if the Lingenfelter LNC-2014 RPM Limiter Timing Retard Launch Controller GM Gen V DI Engines LT4 LTI L86 L8 will work with the Davis system and the LT5?

I don’t use traction control. I do it the old fashion way... with my foot.


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Matt is doing a great job on the sheet metal. It alway amazes me the you buy a rust free California car and all the stuff that needs attention. Car had sat for years and was in primer. 95% solid but it the last 5% that eats all the time.

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Is Sled Alley doing the paint, or are you having Dutchboys shoot it?

JD

Still getting quotes


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Clears the hood!


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Did you ever run a icebox or no real need? Also what front and rear spring rate have you been running ?

Great read, thanx for the link.

I run a big intercooler with no issues. Iceboxes are more of a drag race thing.

For rear spring rates I like 200 lb/inch with the DSE set up. Ok for the street and Ok for the track. A lot of the Goodguys AutoX crowd have moved to around 400 lb/inch. If you want to do well in AutoX then make the car real stiff.


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I went in between. I pulled the 250s off and went with 325. What are you running in the front with the supercharger weight? I currently have 550lbs

I run 550s lb/in in the front. If you put 325 lb/in on the back then my swag not knowing your rear sway bar would be 700 lb/in. On the new Rival S 1.5 with the correct shock valving that is close to what the DSE track cars have on them.

They ride like crap on the street BTW. I trey that setup in Gunner and hated it.

My (soft) set up on Gunner won the Motorstate Challenge road course segment for Vintage last year. I lost the AutoX because you need the 315 tire on the front for AutoX to do real well. And you need to practice AutoX which I don’t do.

Good luck

Mark


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Do you still have any sets of the C&R 40mm thicker bricks and spacer from JA 2.0 you’d like to sell? I know a guy looking for a set.

Sorry sold the last set 10 months ago.


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