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post #1 of 31 Old November 13th, 2014, 08:31 PM Thread Starter
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Gear backlash question

So I just put some ford racing 3.73 gears in my car..pinion preload was set and after I set the backlash the pattern was perfect but they make a lot of noise. I'm a gm guy and in the gm rear ends we set backlash by feel..we tighten till we can feel/hear the gear clicking but can barely see movement so that's how I did it on my car. Does this not work on the fords? Or could my side bearing preload be off?
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post #2 of 31 Old November 13th, 2014, 09:03 PM
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When you set the preload was the seal out? How did you determine the correct preload...inch pds.? I use a dial gauge for backlash...maybe someone that does it daily can do it by feel, but not me. Did you use a new crush sleeve?

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post #3 of 31 Old November 13th, 2014, 09:16 PM Thread Starter
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New crush sleeve and ya the seal was in. What backlash spec do you use?
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post #4 of 31 Old November 13th, 2014, 09:25 PM
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guy that does mine sets gears up by feel, but he does like 3 a week (owns a shop)


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post #5 of 31 Old November 13th, 2014, 09:27 PM
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Generally you expect the backlash to be in the range of 0.008" to 0.012" .

To be honest I've never heard of the "set the backlash by feel approach", maybe it doesn't work well on Ford rears or requires a "different feel".

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post #6 of 31 Old November 13th, 2014, 09:35 PM Thread Starter
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Oh wow I'm way tighter than .008 that's I quite a bit more than the gm set ups so I bet that's what's wrong
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post #7 of 31 Old November 13th, 2014, 10:43 PM
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No offense but The old feel trick is usually used by what I like to call redneck garages because it literally takes one minute to hook up that indicator and lock it onto the rear for a reading. It is imperative that the backlash be set properly with a dial indicator or you'll get a lot of road noise and other issues.


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post #8 of 31 Old November 13th, 2014, 11:01 PM Thread Starter
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None taken although I disagree it's worked perfect for us on the gm vehicles. I'll loosen it up and hopefully that will take care of that
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post #9 of 31 Old November 14th, 2014, 12:07 AM
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When I did mine there was no way I could "feel" the difference between 0.009" (where I set my backlash), 0.004" (first try) and 0.015" (second try).

My gears are silent.

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post #10 of 31 Old November 14th, 2014, 07:12 AM
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Quote:
Originally Posted by Mootang View Post
New crush sleeve and ya the seal was in. What backlash spec do you use?
As mentioned...I go .010 plus or minus a snitch. I always crush the sleeve with the pinion seal out and use the old nut so the seal does not skew the torque value. Then I pull the nut off, install the seal, and use the new nut with the Loctite and tighten it down below the torque used to crush.

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post #11 of 31 Old November 14th, 2014, 08:05 AM Thread Starter
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ok so its sounding like I need to get that backlash loosened up. Thanks everyone!
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post #12 of 31 Old November 20th, 2014, 10:23 PM Thread Starter
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Ok so the wear pattern was perfect and I reset the backlash to .010 and it still makes a lot of noise. I'm very frustrated and need some help here. About ready to take it to a ford shop and pay to have it done. I've taken it apart 3 times now
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post #13 of 31 Old November 20th, 2014, 10:29 PM
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Any pictures of the gear pattern? what did you use to mark the gear pattern?


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post #14 of 31 Old November 20th, 2014, 10:36 PM Thread Starter
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I used the stuff that came with the kit from am. I didn't take a pic but it was right in the center is that correct?
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post #15 of 31 Old November 21st, 2014, 11:15 AM
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They are suppose to be in the middle on both sides of the gear going both directions. If they go any deeper then half you have in both depth and side to side you have some adjusting to do.

One side is the drive side and the other is the Coast side did you check both sides? make sure the gears are not contacting to fast and starting to sharpen the tooth of the gear.


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post #16 of 31 Old November 21st, 2014, 11:39 AM Thread Starter
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I don't think I checked both sides. It makes noise around 40-50 under very light throttle and coast.
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post #17 of 31 Old November 21st, 2014, 11:45 AM
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I think you just found the problem you need to look at the pattern on your coast side which is the concave side of the gear or the backside.


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post #18 of 31 Old November 21st, 2014, 10:47 PM Thread Starter
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So pinion prolly needs adjusted?
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post #19 of 31 Old November 22nd, 2014, 09:06 AM
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more then likely but unfortunately youll have to crack the cover to see exactly what is out of adjustment.


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post #20 of 31 Old November 22nd, 2014, 10:07 AM Thread Starter
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Dang. I've had this thing apart 3 times already. Fluid cost 50 bucks with the friction modifier. Getting frustrated but guess there's nothing else to do
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