Limited Slip Def?
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Joined: Dec 2004
Posts: 15
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From: WNY
Limited Slip Def?
Ok, I am having a blonde day. I have a 2002 F-150 two wheel drive standard transmittion. What is limited slip, and how do I know if I have it.
Char
The reason I am asking is cause I was reading some posts about Thud noises and I am having that only when i use my brake but not every time I use my brake. It usually happens when my gas tank is full. I am due to get my truck inspected this month and was wondering if I should have them look at something specific while inspecting the truck.
Char
The reason I am asking is cause I was reading some posts about Thud noises and I am having that only when i use my brake but not every time I use my brake. It usually happens when my gas tank is full. I am due to get my truck inspected this month and was wondering if I should have them look at something specific while inspecting the truck.
Member
Joined: Jan 2005
Posts: 56
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From: gray, ga
a limited slip differential is somewhere between an open and a locking differential. it helps keep both rear wheels turning, rather than letting one start to slip, and then all the power being transferred to the spinning wheel. limited slips can be overcome, but it is more difficult than an open diff. both tires would have to break loose, unless one tire happened to be in the air. on the other hand, a locker actually locks both axles together, and if one wheel is turning both are turning.
does your clunk happen when you accelerate, particularly from a stop? i am not sure what your full fuel tank may have to do with it, but perhaps it is just the fact the truck is carrying more weight. anyway, i'd have the u-joints in the driveshaft checked out. sometimes they get a little worn and let the shaft slop around, resulting in a thud.
-matt
does your clunk happen when you accelerate, particularly from a stop? i am not sure what your full fuel tank may have to do with it, but perhaps it is just the fact the truck is carrying more weight. anyway, i'd have the u-joints in the driveshaft checked out. sometimes they get a little worn and let the shaft slop around, resulting in a thud.
-matt
Senior Member
Joined: May 2004
Posts: 5,409
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From: Sunny FL
Look on the bottom of the driver side door pillar there will be a white sticker with information on it. (build date, VIN, axle code, etc. etc.) Here is a list of axle codes.
Axle Codes
non-limited slip
X27 – 3:31
X19 – 3:55
X26 – 3:73
X25 – 4:10
limited slip
H9 – 3:55
B6 – 3:73
B5 – 4:10
some more info
Auburn Gear Positraction
The highly efficient torque transfer capability of the Auburn Gear limited-slip differential is achieved through the use of cone clutches coupled to beveled side gears. As torque is transmitted through the differential side gears to the axle shafts, the side gear separating forces and spring pre-load firmly seat the cones into the differential case. The cone design, along with the applied force, determines the torque transfer capability of the differential. When torque levels decrease, as in a cornering maneuver, the gear separating forces also decrease, allowing the axle shafts to rotate independently. Also, in order to address the non-rebuildable components within the Auburn Gear differentials we are offering the NEW D-REX PROGRAM. If your Auburn Positraction wears out, , you can send your old unit back with a copy of your original receipt within 4 years and for approximately $100(varies by application) you will receive a brand new unit.
Eaton Positraction
Muscle cars, hot rods and mild off-road vehicles should look to Eatons limited-slip differential for their traction answers. And the fact is, Eatons Positraction units are virtually bullet proof. They have precision forged gears for high impact strength and durability, Formula One race-bred carbon friction discs for lifelong, chatter-free operation, and a spring pre-load pack combined with a field proven, high performance cast iron case for unbelievable durability. Eaton Positractions are rebuildable and can be upgraded to 200lb, 400lb, or 800lb springs and plates. You can also upgrade the clutch packs from 14 discs to 18 or 22 steel discs for more aggressiveness.
Detroit Truetrac Positraction
The Detroit Truetrac provides a controlled amount of resistance to a one-wheel spinout, so that the other wheel (with traction) receives sufficient power to keep the vehicle moving. It uses pairs of "Helical" gear sets and no clutch packs to wear out, it is an aggressive unit yet smooth and quiet on the street, the torque bias ratios of 2.5 to 3.5:1 range, and is ideal for 4WD front axles or rear axles, as well as 2WD light trucks, SUV’s, cars.
Track-lok Positraction
The Track-lok is a mild and smooth Positraction that can be found in most Ford, Dodge, and Jeep differentials equipped with the factory limited slips. It uses flat and bevel clutches for preload. It is a less expensive unit and recommended for cars and trucks without a lot of horsepower and is simply towing a small trailer or boat.
Power-lok Positraction
The Power-lok is an extremely strong and durable Positraction. It utilizes a 2-Piece carrier case with four pinion gears instead of the traditional two pinion gears. Older Power-lok’s came with steel drive and driven clutches. Later model Power-lok’s come with carbon fiber clutches to avoid noise and chatter when driving on the street. Stock Power-lok’s usually come with the clutches set-up smooth, but by restacking the clutches in different orders and with more bevel discs, you can make it more aggressive. This Positraction works great in many applications except for rock crawling
Axle Codes
non-limited slip
X27 – 3:31
X19 – 3:55
X26 – 3:73
X25 – 4:10
limited slip
H9 – 3:55
B6 – 3:73
B5 – 4:10
some more info
Auburn Gear Positraction
The highly efficient torque transfer capability of the Auburn Gear limited-slip differential is achieved through the use of cone clutches coupled to beveled side gears. As torque is transmitted through the differential side gears to the axle shafts, the side gear separating forces and spring pre-load firmly seat the cones into the differential case. The cone design, along with the applied force, determines the torque transfer capability of the differential. When torque levels decrease, as in a cornering maneuver, the gear separating forces also decrease, allowing the axle shafts to rotate independently. Also, in order to address the non-rebuildable components within the Auburn Gear differentials we are offering the NEW D-REX PROGRAM. If your Auburn Positraction wears out, , you can send your old unit back with a copy of your original receipt within 4 years and for approximately $100(varies by application) you will receive a brand new unit.
Eaton Positraction
Muscle cars, hot rods and mild off-road vehicles should look to Eatons limited-slip differential for their traction answers. And the fact is, Eatons Positraction units are virtually bullet proof. They have precision forged gears for high impact strength and durability, Formula One race-bred carbon friction discs for lifelong, chatter-free operation, and a spring pre-load pack combined with a field proven, high performance cast iron case for unbelievable durability. Eaton Positractions are rebuildable and can be upgraded to 200lb, 400lb, or 800lb springs and plates. You can also upgrade the clutch packs from 14 discs to 18 or 22 steel discs for more aggressiveness.
Detroit Truetrac Positraction
The Detroit Truetrac provides a controlled amount of resistance to a one-wheel spinout, so that the other wheel (with traction) receives sufficient power to keep the vehicle moving. It uses pairs of "Helical" gear sets and no clutch packs to wear out, it is an aggressive unit yet smooth and quiet on the street, the torque bias ratios of 2.5 to 3.5:1 range, and is ideal for 4WD front axles or rear axles, as well as 2WD light trucks, SUV’s, cars.
Track-lok Positraction
The Track-lok is a mild and smooth Positraction that can be found in most Ford, Dodge, and Jeep differentials equipped with the factory limited slips. It uses flat and bevel clutches for preload. It is a less expensive unit and recommended for cars and trucks without a lot of horsepower and is simply towing a small trailer or boat.
Power-lok Positraction
The Power-lok is an extremely strong and durable Positraction. It utilizes a 2-Piece carrier case with four pinion gears instead of the traditional two pinion gears. Older Power-lok’s came with steel drive and driven clutches. Later model Power-lok’s come with carbon fiber clutches to avoid noise and chatter when driving on the street. Stock Power-lok’s usually come with the clutches set-up smooth, but by restacking the clutches in different orders and with more bevel discs, you can make it more aggressive. This Positraction works great in many applications except for rock crawling