Sonnax just came out with an updated spacer for preventing front seal leaks.

[BrooklynBay]

Sonnax just came out with an updated crankshaft to flywheel spacer to prevent front converter seal leaks, and damaged flywheels. 2 different models are listed on page 99 in their new (volume 6) transmission specialties catalog. The part #s are: Sonnax 56000-CS6 6 bolts. 56000-CS8 8 bolts. The OEM version is powdered metal. Their version is billet steel. Their part adds 1/16" of pilot support compared to the OEM version, and helps prevent vibration, cracked flywheels, and converter misalignment. I called Sonnax 2X trying to find out which applications use the 6 bolt, and 8 bolt versions. They said that they would call me back once they have the information. So far, they are stumped. I called the Ford dealer, and they said my 93 with a 4.0 uses the 6 bolt spacer. Which vehicles use the 8 bolt version? Nobody knows. My ATSG A4LD update manual states on page 11 that the 6 bolt spacer is used on 2.8L, 2.9L, and 4.0L engines only. It recommends replacing this spacer when there is continuous front seal leakage, premature converter hub wear, bushing wear, and pump gear damage.

 

[BrooklynBay]

There is an article on WWW.Atra.Com that explains how low engine coolant could cause the front seal to leak! Here is the link: Dead Link Removed

 

[Glacier991]

The flywheel spacer reaplcement is covered in the A4LD diary. Sonnax just came out with a billet model is all.

 

[BrooklynBay]

Which applications use the 6 bolt style, and 8 bolt styles? From what I've found out so far, it seems that most applications use the 6 bolt model. The Sonnax model adds 1/16" of pilot support. Since their model is a little bit larger, it seems that there would be less of a gap for leaks to occur. The billet style is some sort of steel material, but I'm not sure exactly what it is. It has a look like chrome, or stainless steel, but doesn't have as much of a shine. I know that performance pulleys are also the billet style.