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> Jeep Articles > General - Product Reviews > Advance Adapters Heavy Duty SYE

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General Articles - Product Reviews

Advance Adapters Heavy Duty SYE

Article written by Dr. Jones

Date Added: 07/16/2006

Long term test

While the Tom Wood?s SYE is a great product, we have had a couple problems with the output seal leaking on the standard SYE. The seal he uses is a couple of rubber donuts held in place in the tail housing by a sealant/adhesive. Over the years the quality of the seal has been improved, and we haven?t yet tried the latest version. When the last one started leaking, we rebuilt the seal with RTV and so far (almost one year later) it?s still holding. Since this XJ is a daily driver, we didn?t want to have to worry at all about the seal leaking.

We definitely wanted a Tom Wood?s driveshaft, so we decided to get the Advance Adapters Heavy Duty SYE and driveshaft from him.

The AA heavy duty kit is a totally different setup. It uses a full replacement main shaft, not a machined stock shaft. It is larger diameter and 32 spline vs. the stock 27 spline. Even the replacement tail housing is beefy. The seal used on the heavy duty kit is a separate, replaceable piece. It presses in place much like an axle seal and should be available aftermarket through most parts stores (though you will need the number off the seal).

We have driven this setup almost every day for the past year. It has four trips to Moab on it and numerous local wheeling trips. The seal hasn?t leaked a drop the whole time.
This isn?t an installation article, but we?ll give you a couple tips. Get a good pair of heavy duty snap-ring pliers. Don?t even waste your time messing with small ones. As with any installation that involves some disassembly, keep careful track of the parts you took off and where they go. Pay particular attention to the placement of the shift fork and the oil pump.
Here you can see the difference between the stock main shaft and the heavy duty one.
Here is the standard Tom Wood's SYE on the Barney TJ.
Here is the AA Heavy Duty SYE. Notice the difference in the tail housing.
The strength of the combination of the HD SYE and the Tom Wood?s driveshaft is unbeatable. We probably pound this Jeep a little too hard for a daily driver, so personally I?m very glad it?s in there.

Final Thoughts

The standard Tom Wood?s SYE is great most of the time. We have never broken one or had any problems besides the leaking seal. But, if you can afford the price difference, we would definitely recommend the heavy duty SYE. With the extra strength of the Heavy duty kit and the Tom Wood?s Driveshaft, we can hammer the throttle without a care in the world.

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