TeraFlex 60 vs. Currie Rock Jock 60 vs. Dynatrac
12-03-2008, 05:24 AM
#13
JK Junkie
12-03-2008, 06:31 AM
#15
JK Super Freak
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Dynatrac makes good stuff as well
although different beast in their pro rock line then the Currie and Teraflex lines
not sure if it is fair to compare them
although different beast in their pro rock line then the Currie and Teraflex lines
not sure if it is fair to compare them
12-03-2008, 06:40 AM
#16
Sponsoring Vendor
Dynatrac
We have installed around 10 sets of DynaTrac Pro Rocks this year. They handle great on road as an every day driver as well as their Legendary track record of being the premier off road axle due to its strength and awesome ground clearance. They also provide excellent customer service and stand behind their product 100%. My customers have been very happy with them.
The New Dyna Trac 44 pro rock is Awesome and will be a great way to gain ground clearance and axle housing strength and use all your Rubicon internals if you want or even up grade to 35 spline
Mel Wade
The New Dyna Trac 44 pro rock is Awesome and will be a great way to gain ground clearance and axle housing strength and use all your Rubicon internals if you want or even up grade to 35 spline
Mel Wade
Last edited by Evolution; 12-03-2008 at 06:42 AM.
12-03-2008, 09:25 AM
#17
Former Vendor
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The Currie Rock Jock 60 and Terra CRD60R are the only 60's in the market that use the large pinion bearing on both sides of the pinion. Hi-Pinion axles were originally designed by Dana to be used as a front axle only.
When a Hi-Pinion axle is used on the front of a vehicle, the forces on the pinion "push" the pinion away from the ring gear putting a load on the large (inside) pinion bearing.
The opposite happens when a Hi-Pinion is used on the rear, the forces on the pinion "pull" the pinion towards the ring gear putting a load on the small (outside) pinion bearing.
The small outside pinion bearing was not designed to take the extra load. The extra load can cause the bearing to over heating leading to premature failure.
Currie designed the Rock Jock 60 to accept the large bearing on both sides of the pinion and took it a step further and improved the oiling system to keep a constant flow of oil on the front and rear of the pinion bearings.
Last edited by David @ Currie Ent.; 12-03-2008 at 09:28 AM.
12-03-2008, 01:31 PM
#19
Sponsoring Manufacturer
This post will probably be a little lengthy, but will help to explain some of the TeraFlex philosophy and history that goes into our heavy duty axles.
Before anything is said, we firmly believe that the TeraFlex 60CRD and the Currie axle are great products, and both will exceed your expectations.
Now for the technical meat.
Both axles are based on the Dana 60 high pinion front axle used in the larger Ford trucks. If you build a rear axle based on that housing you would have three areas of concern;
1- efficient oiling,
2- outer pinion bearing life and
3- ground clearance.
To the degree that these three areas are addressed says a great deal about the manufacturers understanding of the product, and the intended use of the product.
1- Efficient oiling. Because the pinion angle is flat/low in the front Ford application the oil system is basically a slosh type that bathes the bearings by virtue of its oil level, filling into the bearing cavity. When the axle is placed in the rear the pinion angle incline is increased from 5 to15 degrees or even more. The oil now has to reach a bearing that is several inches above the oil level and out of the splash zone. A quick test drive on the freeway will show you that the oil flow is inadequate. Teraflex designed the 60CRD oiling system with a high-flow tri-chamber system that uses an industry first Oil Skimmer which shaves the oil off the ring gear pressurizing the larger chamber that feeds into the outer bearing cavity first, this cavity also keeps a reservoir of oil which helps in extended slow, steep hill climbs. All the oil flows through the most critical bearing first and then the inner bearing with its reservoir second before returning to the main cavity. The Oil Skimmer and the larger cavity maintain a healthy flow of oil to dissipate any concerns with oil getting to hot in the heavily loaded outer bearing. We also have cooling fins cast into the housing to dissipate the heat away. We proved the oil flow design before selling it, (For some video of our oil flow testing follow this link CRD60R oil testing Note: The various RPMs and incline degrees represent the range of lifts for Jeeps and various trail & freeway speeds).
We also had some of the best rockcrawlers do some ‘light’ torture testing on the product to further reinforce the axle dominance, dependability and durability, Through several full competition seasons these axles held up, and continue to run the rockcrawling and rockracing circuits.
2- Outer Pinion Bearing Life; when the high pinion axle is used in the rear application the load used to go forward is transferred to the outer pinion bearing which is smaller and has a lower bearing life rating. To address this it becomes necessary to upgrade this bearing. To upgrade the bearing it has to be bigger. To do this and retain the original and very common pinion seal we made a removable seal holder which allowed us to upgrade to a big bearing and keep the popular seal. It’s real handy if you have to open up your axle for a gear change or locker change.
3- Ground Clearance; TeraFlex’s CRD or “Constant Radius Design” was the first on the market way back in 2000 and featured our answer to the bulky Ford housing problem. It does have better than a Dana 44 ground clearance (a Teraflex first). The rotated cover is a standard 60 size but you won’t need to worry about that since we include our extreme cast steel Teraflex cover. Both the Rock Jock and the CRD60 achieve great ground clearance without sacrificing oil volume.
4- Other notes of Importance-
Our axle shafts really set the CRD60 apart from other brands; typically axle shafts are made of 1541 which is the material the factory uses, then for an additional charge you can get the stronger 4140 Alloy steel shafts. Our standard axle shafts are 4140.
Another TeraFlex feature seldom seen in aftermarket shafts is shaft profiling which reduces the body of the shaft to a smaller diameter giving it a torsion benefit to dampen shock loads. Proper axle shaft profiling will yield the highest axle shaft strength. The below image is from "Engineer To Win" by Carroll Smith P.120, and explains in brutal honesty the three main designs of axle shafts.
(for a really good tech article on axle shafts check out Billavistas write-up over on Pirate).
We also feature rolled splines, which increases the strength by as much as 25%. Our shafts are standard with the JK lug pattern and the popular 5 on 5.5”.
We have chose to use the very popular Set 20 bearing because it has such an impressive track record and is used on many full size pick up trucks. This helps in several ways- the main reason being that the local parts store will have them on the shelf, but you’ll probably never need one, as they are much stronger than the set 10 factory bearing.
In conclusion, there are many different aftermarket axle offerings available. Each one follows a different philosophy. We feel that because of the innovations and direction that we have taken with our Heavy Duty CRD60R axle line, many have been forced to follow and emulate. The TeraFlex CRD60R, was the first aftermarket high performance, high pinion Dana 60 application specific for Jeep vehicles, and continues as the industry leader.
Before anything is said, we firmly believe that the TeraFlex 60CRD and the Currie axle are great products, and both will exceed your expectations.
Now for the technical meat.
Both axles are based on the Dana 60 high pinion front axle used in the larger Ford trucks. If you build a rear axle based on that housing you would have three areas of concern;
1- efficient oiling,
2- outer pinion bearing life and
3- ground clearance.
To the degree that these three areas are addressed says a great deal about the manufacturers understanding of the product, and the intended use of the product.
1- Efficient oiling. Because the pinion angle is flat/low in the front Ford application the oil system is basically a slosh type that bathes the bearings by virtue of its oil level, filling into the bearing cavity. When the axle is placed in the rear the pinion angle incline is increased from 5 to15 degrees or even more. The oil now has to reach a bearing that is several inches above the oil level and out of the splash zone. A quick test drive on the freeway will show you that the oil flow is inadequate. Teraflex designed the 60CRD oiling system with a high-flow tri-chamber system that uses an industry first Oil Skimmer which shaves the oil off the ring gear pressurizing the larger chamber that feeds into the outer bearing cavity first, this cavity also keeps a reservoir of oil which helps in extended slow, steep hill climbs. All the oil flows through the most critical bearing first and then the inner bearing with its reservoir second before returning to the main cavity. The Oil Skimmer and the larger cavity maintain a healthy flow of oil to dissipate any concerns with oil getting to hot in the heavily loaded outer bearing. We also have cooling fins cast into the housing to dissipate the heat away. We proved the oil flow design before selling it, (For some video of our oil flow testing follow this link CRD60R oil testing Note: The various RPMs and incline degrees represent the range of lifts for Jeeps and various trail & freeway speeds).
We also had some of the best rockcrawlers do some ‘light’ torture testing on the product to further reinforce the axle dominance, dependability and durability, Through several full competition seasons these axles held up, and continue to run the rockcrawling and rockracing circuits.
2- Outer Pinion Bearing Life; when the high pinion axle is used in the rear application the load used to go forward is transferred to the outer pinion bearing which is smaller and has a lower bearing life rating. To address this it becomes necessary to upgrade this bearing. To upgrade the bearing it has to be bigger. To do this and retain the original and very common pinion seal we made a removable seal holder which allowed us to upgrade to a big bearing and keep the popular seal. It’s real handy if you have to open up your axle for a gear change or locker change.
3- Ground Clearance; TeraFlex’s CRD or “Constant Radius Design” was the first on the market way back in 2000 and featured our answer to the bulky Ford housing problem. It does have better than a Dana 44 ground clearance (a Teraflex first). The rotated cover is a standard 60 size but you won’t need to worry about that since we include our extreme cast steel Teraflex cover. Both the Rock Jock and the CRD60 achieve great ground clearance without sacrificing oil volume.
4- Other notes of Importance-
Our axle shafts really set the CRD60 apart from other brands; typically axle shafts are made of 1541 which is the material the factory uses, then for an additional charge you can get the stronger 4140 Alloy steel shafts. Our standard axle shafts are 4140.
Another TeraFlex feature seldom seen in aftermarket shafts is shaft profiling which reduces the body of the shaft to a smaller diameter giving it a torsion benefit to dampen shock loads. Proper axle shaft profiling will yield the highest axle shaft strength. The below image is from "Engineer To Win" by Carroll Smith P.120, and explains in brutal honesty the three main designs of axle shafts.
(for a really good tech article on axle shafts check out Billavistas write-up over on Pirate).
We also feature rolled splines, which increases the strength by as much as 25%. Our shafts are standard with the JK lug pattern and the popular 5 on 5.5”.
We have chose to use the very popular Set 20 bearing because it has such an impressive track record and is used on many full size pick up trucks. This helps in several ways- the main reason being that the local parts store will have them on the shelf, but you’ll probably never need one, as they are much stronger than the set 10 factory bearing.
In conclusion, there are many different aftermarket axle offerings available. Each one follows a different philosophy. We feel that because of the innovations and direction that we have taken with our Heavy Duty CRD60R axle line, many have been forced to follow and emulate. The TeraFlex CRD60R, was the first aftermarket high performance, high pinion Dana 60 application specific for Jeep vehicles, and continues as the industry leader.
12-03-2008, 05:42 PM
#20
JK Super Freak
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Ok.. I was leaning toward the Dynatrac 60's front and rear. Do Currie and Teraflex offer the option of a locking front hub? I'm planning on stub hubs, detroit rear locker, arb front locker, and 5.38 gears.
I love this forum.. All you manufacturers chime in and help us in our decisions with your awsome discriptions of your products. And I never feel like your trying to sell it. Just inform. You guys rock.
Things I'm looking for out of a 60. Lockers obviously. Maximum strenght and longevity. (highway and offroad). Flexablility of Shock/ track bar mounting. Skids on the control arm and shock mount brackets. Front Locking hubs.
I know this may be a real stupid question but, no one has mentioned it and I want to know. Are these axles full floating? I would think so because they come from a 1 ton app.
I love this forum.. All you manufacturers chime in and help us in our decisions with your awsome discriptions of your products. And I never feel like your trying to sell it. Just inform. You guys rock.
Things I'm looking for out of a 60. Lockers obviously. Maximum strenght and longevity. (highway and offroad). Flexablility of Shock/ track bar mounting. Skids on the control arm and shock mount brackets. Front Locking hubs.
I know this may be a real stupid question but, no one has mentioned it and I want to know. Are these axles full floating? I would think so because they come from a 1 ton app.