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PostPosted: Tue Jun 21, 2016 12:30 pm 
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Joined: Tue Sep 14, 2004 9:39 am
Posts: 115
Background:
Mustang with 8.8" rear

Backlash
I've read anywhere between 0.008-0.012. Not sure if tight or loose is better for racing

Pinion Depth
Does everyone setup their pinion depth for a wear pattern in the middle of the gear, or do you favor the heel or toe of the gear?

Pinion Drag
I've seen anywhere between 16-24 in-lbs on a new bearing... High side or low side of that range??

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Marshall Mosty
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PostPosted: Thu Jun 23, 2016 10:43 am 
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Joined: Sat Jan 29, 2011 10:17 pm
Posts: 8
Location: Seymour, IN
marshall_mosty wrote:
Background:
Mustang with 8.8" rear

Backlash
I've read anywhere between 0.008-0.012. Not sure if tight or loose is better for racing

Happy medium on this guy. Too loose invites more shock loading and noise when you transition from acceleration to deceleration and vice versa. Too tight invites a smaller oil film for lubrication and cooling. Anywhere in that range should be fine.

Pinion Depth
Does everyone setup their pinion depth for a wear pattern in the middle of the gear, or do you favor the heel or toe of the gear?

Right in the middle. Ever so slightly biased towards toe is ok. More safety margin in the toe.


Pinion Drag
I've seen anywhere between 16-24 in-lbs on a new bearing... High side or low side of that range??

Can't comment here.


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2010 Camaro SS - "Budget" AI Build In Progress


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PostPosted: Mon Jun 27, 2016 1:11 pm 
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Joined: Tue Sep 14, 2004 9:39 am
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lonewolf583 wrote:
marshall_mosty wrote:
Background:
Mustang with 8.8" rear

Backlash
I've read anywhere between 0.008-0.012. Not sure if tight or loose is better for racing

Happy medium on this guy. Too loose invites more shock loading and noise when you transition from acceleration to deceleration and vice versa. Too tight invites a smaller oil film for lubrication and cooling. Anywhere in that range should be fine.

Pinion Depth
Does everyone setup their pinion depth for a wear pattern in the middle of the gear, or do you favor the heel or toe of the gear?

Right in the middle. Ever so slightly biased towards toe is ok. More safety margin in the toe.


Pinion Drag
I've seen anywhere between 16-24 in-lbs on a new bearing... High side or low side of that range??

Can't comment here.



Ended up with 0.0075 backlash, wear pattern right in the middle and 26 in-lbs for the pinion drag... It's been about 11 years since I've setup gears and forgot how much assemble/check/disassemble/repeat there is...

_________________
Marshall Mosty
AI Series Director
NASA/TX AI #67


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PostPosted: Mon Jun 27, 2016 1:11 pm 
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Forum Hot Lapper
Forum Hot Lapper

Joined: Tue Sep 14, 2004 9:39 am
Posts: 115
lonewolf583 wrote:
marshall_mosty wrote:
Background:
Mustang with 8.8" rear

Backlash
I've read anywhere between 0.008-0.012. Not sure if tight or loose is better for racing

Happy medium on this guy. Too loose invites more shock loading and noise when you transition from acceleration to deceleration and vice versa. Too tight invites a smaller oil film for lubrication and cooling. Anywhere in that range should be fine.

Pinion Depth
Does everyone setup their pinion depth for a wear pattern in the middle of the gear, or do you favor the heel or toe of the gear?

Right in the middle. Ever so slightly biased towards toe is ok. More safety margin in the toe.


Pinion Drag
I've seen anywhere between 16-24 in-lbs on a new bearing... High side or low side of that range??

Can't comment here.



Ended up with 0.0075 backlash, wear pattern right in the middle and 26 in-lbs for the pinion drag... It's been about 11 years since I've setup gears and forgot how much assemble/check/disassemble/repeat there is...

_________________
Marshall Mosty
AI Series Director
NASA/TX AI #67


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 Profile  
 
PostPosted: Tue Jun 28, 2016 5:27 am 
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Joined: Sat Jan 29, 2011 10:17 pm
Posts: 8
Location: Seymour, IN
marshall_mosty wrote:
lonewolf583 wrote:
marshall_mosty wrote:
Background:
Mustang with 8.8" rear

Backlash
I've read anywhere between 0.008-0.012. Not sure if tight or loose is better for racing

Happy medium on this guy. Too loose invites more shock loading and noise when you transition from acceleration to deceleration and vice versa. Too tight invites a smaller oil film for lubrication and cooling. Anywhere in that range should be fine.

Pinion Depth
Does everyone setup their pinion depth for a wear pattern in the middle of the gear, or do you favor the heel or toe of the gear?

Right in the middle. Ever so slightly biased towards toe is ok. More safety margin in the toe.


Pinion Drag
I've seen anywhere between 16-24 in-lbs on a new bearing... High side or low side of that range??

Can't comment here.



Ended up with 0.0075 backlash, wear pattern right in the middle and 26 in-lbs for the pinion drag... It's been about 11 years since I've setup gears and forgot how much assemble/check/disassemble/repeat there is...


It's definitely tedious!

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2010 Camaro SS - "Budget" AI Build In Progress


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PostPosted: Wed Jul 13, 2016 1:38 pm 
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Joined: Tue Apr 21, 2015 4:18 pm
Posts: 5
https://performanceparts.ford.com/downl ... 4209-8.pdf

I used this and it helped alot. As far as high or low end of preload, i'd say higher end since new bearings wear in and might loosen a hair.


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PostPosted: Fri Sep 02, 2016 3:18 pm 
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Joined: Sat Nov 17, 2007 1:24 pm
Posts: 35
Backlash is a little tight. Shoot for .011-.015 next time. i.e., for road racing.


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