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marshall_mosty

Rear gear setup thoughts for AI

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marshall_mosty

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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lonewolf583
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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marshall_mosty
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...

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marshall_mosty
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...

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lonewolf583
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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B-MAC

Backlash is a little tight. Shoot for .011-.015 next time. i.e., for road racing.

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