t56 pilot bearing

[thumper877]

I have a new crate motor ls3 525 hp I just got my t56 magnum close ratio 6 speed do I need to change the pilot bearing or will the factory one work thanks

[Oregon]

There are two different pilot bearings. One is larger outer diameter and sits closer to the transmission. The other is smaller and sits deeper in the crank.

http://www.lateral-g.net/tech_articles/LS7_install/0019.jpg

The way I checked was to install the bell-housing (and block saver plate) on the transmission and measure the length of the input shaft extending beyond the bell-housing.

From the GM performance parts catalog:
14061685 Pilot Bearing (not shown) Use with manual transmissions if the input shaft extends beyond the bell housing more than 20mm
12557583 Pilot Bearing (not shown) Use with manual transmissions if the input shaft extends beyond the bell housing 5mm or less (or recessed slightly)

[icemanrd19]

shouldn't have a pilot bearing installed. I have a extra one. I didn't know there was two options. pace performance sent me mine

[thumper877]

Thanks great info Oregon appreciate it

[badazz81z28]

Thanks great info Oregon appreciate it


It's the bellhousing that dictates the bearing. What bellhousing are you using?

[thumper877]

The quicktime steel housing

[badazz81z28]

The smaller bearing is the correct one.

[thumper877]

Thank u