Discussion Starter · #1 ·
Which would you choose as a pilot bearing for a TKX transmission the simple bronze bushing or a roller bushing?
Do your thing.In most cases, this is a porous bronze, pre-flexplate bushing rather than an actual bearing, as it is often called. A few applications still use an actual bearing and others use a needle roller type bearing, but by far, the most common type is bronze. You cannot use a roller bearing on a transmission shaft originally designed for a bronze bushing due to different type of heat treatment on the shafts.
I don’t think you’ve had a top loader out of an early Mustang for servicing with 30,000 miles on a roller input.You guys realize that every car made since like 1975 has roller pilot bearings and there is no stampede to get them replaced.
If you index your bellhousing, a roller bearing will work great. If you don't, a bronze bushing won't be the first thing to fail.
Yep…I’ve had a bearing fail and seize up on the input shaft…that wasn’t fun..Bronze bushing all the way in any engine / transmission combination where applicable.
Better support and no moving parts to fail.
I use a similar sealed bearing (like above) in my 434w due to the abrasiveness of the sinterned iron racing clutch disc material used in racing. These clutches are designed to be slipped during launch and gear shifts to improve ET's and to limit drivetrain breakage with ultra sticky tires.Yes, we do realize that modern cars have SEALED roller pilot bearings. They look like this one from a 2010 Corvette:
A couple of points, the OP was in reference to a Tremec TKX transmission, and yes, the Tremec input shafts are compatible with the needle bearing style pilot bearings and yes, the pilot bearings have a O ring seal facing the flywheel and are interference fit. so for all intensive purposes, are sealed against debris and clutch dust. The choice on whether to use one or the other is opinion.I don’t think you’ve had a top loader out of an early Mustang for servicing with 30,000 miles on a roller input.
Yes, we do realize that modern cars have SEALED roller pilot bearings. They look like this one from a 2010 Corvette:
View attachment 886751
Below is one like you’ll put on a top loader. Notice the exposed rollers, ready to eat your clutch dust? Notice it uses your input shaft as the bearing race, something it wasn’t hardened to do, indexed or not. The early crankshaft is also not machined or designed for the much larger diameter needed to house a sealed bearing with its own race. So this is what you get:
View attachment 886752