Precision or Yukon?
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Precision or Yukon?
First things first.
I've read multiple posts here about trying to get 4.56:1 ring & pinion sets from Ford Racing for 9.75 rear end. Most asked question has been: When will Ford Racing actually have them versus just listing them on their website? Answer: They're now available. Second most asked question: Are they Ford OEM? Answer: No. Ford Racing tech says they're made by Motive Gear.
Based on all the HIGHLY VALUABLE input here (shameless brown-nosing) I'm getting 4.56s to go with the 325/65R18 Nitto T/Gs (and Rancho 4") on my '06 Black FX4 SCAB.
Top choices look to be Precision or Yukon.
Wanted to know what you guys think before I take the plunge.
Don't want to have to whine about whine later.
I've read multiple posts here about trying to get 4.56:1 ring & pinion sets from Ford Racing for 9.75 rear end. Most asked question has been: When will Ford Racing actually have them versus just listing them on their website? Answer: They're now available. Second most asked question: Are they Ford OEM? Answer: No. Ford Racing tech says they're made by Motive Gear.
Based on all the HIGHLY VALUABLE input here (shameless brown-nosing) I'm getting 4.56s to go with the 325/65R18 Nitto T/Gs (and Rancho 4") on my '06 Black FX4 SCAB.
Top choices look to be Precision or Yukon.
Wanted to know what you guys think before I take the plunge.
Don't want to have to whine about whine later.
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Joined: Jul 2005
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From: Temecula, CA
Precisions whine too. 
But, either set is good. Are you doing the install or a local shop? If a local shop is doing the install, get a waranty on them and it wont matter which set you get. Even Genuine is a good set with a warranty.
I have some gear whine at highway speeds when "coasting". I have a warranty on the gears so the truck is going in after Thanksgiving at no charge to me.
But, either set is good. Are you doing the install or a local shop? If a local shop is doing the install, get a waranty on them and it wont matter which set you get. Even Genuine is a good set with a warranty.
I have some gear whine at highway speeds when "coasting". I have a warranty on the gears so the truck is going in after Thanksgiving at no charge to me.
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Much thanks for the input you guys!!!
Based on bigtruck311's extensive r&p experience, sounds like Precision would be the way to go with Yukon a close second.
I've heard conflicting opinions on whine:
1. "All r&p gears over 3.73 or so will whine somewhat. It's the nature of the beast."
2. "A well done r&p install won't whine even with 4.88s and beyond."
Per your question brypink2 - I'd planned to have the dealership do it. Service Mgr is a friend and chief mechanic came in #2 in Ford's national mechanic's competition. I figure that improves my odds. Don't know that they'll formally "warranty" their work per se, but expect they'd make it right if it's not the first time.
Based on bigtruck311's extensive r&p experience, sounds like Precision would be the way to go with Yukon a close second.
I've heard conflicting opinions on whine:
1. "All r&p gears over 3.73 or so will whine somewhat. It's the nature of the beast."
2. "A well done r&p install won't whine even with 4.88s and beyond."
Per your question brypink2 - I'd planned to have the dealership do it. Service Mgr is a friend and chief mechanic came in #2 in Ford's national mechanic's competition. I figure that improves my odds. Don't know that they'll formally "warranty" their work per se, but expect they'd make it right if it's not the first time.
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Joined: Jul 2004
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From: oceanside C.A.
Originally Posted by rcullinan
Much thanks for the input you guys!!!
Based on bigtruck311's extensive r&p experience, sounds like Precision would be the way to go with Yukon a close second.
I've heard conflicting opinions on whine:
1. "All r&p gears over 3.73 or so will whine somewhat. It's the nature of the beast."
2. "A well done r&p install won't whine even with 4.88s and beyond."
Per your question brypink2 - I'd planned to have the dealership do it. Service Mgr is a friend and chief mechanic came in #2 in Ford's national mechanic's competition. I figure that improves my odds. Don't know that they'll formally "warranty" their work per se, but expect they'd make it right if it's not the first time.
Based on bigtruck311's extensive r&p experience, sounds like Precision would be the way to go with Yukon a close second.
I've heard conflicting opinions on whine:
1. "All r&p gears over 3.73 or so will whine somewhat. It's the nature of the beast."
2. "A well done r&p install won't whine even with 4.88s and beyond."
Per your question brypink2 - I'd planned to have the dealership do it. Service Mgr is a friend and chief mechanic came in #2 in Ford's national mechanic's competition. I figure that improves my odds. Don't know that they'll formally "warranty" their work per se, but expect they'd make it right if it's not the first time.
a skilled mech that takes his time will be able to get a RP to not whine, but it will have to be a perfect pattern for anything above a 4.10 and than only alittle off throttle(coast side) would be aceptable to me, i have 4.88 and i have just a tiny bit of off throttle whine and i have a perfect pattern when i did my ring and pinion, i used genuin gears because it was the only 4.88 avaliable at the time and i have heard they have a tendancy to have alittle off throttle whine, just make sure you have a good tech. do the install and you should have no problems, good luck
