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this is from my tranbrake trans. no sign of wear anywhere but here and the thrust washer between the front hub and the direct drum. fwiw it's a '01 case and stock internally (hardparts-wise) other than the billet shafts.
I've had this happen with a billet main shaft that was slightly longer than stock. Using a thicker washer or bearing will help.
that was the only washer that showed any real wear. even the planet thrusts looked great. (well the center support to reaction carrier sleeve bushing was medium bad, but apparently par for the course with a transbrake)
I do measure the main shafts against a stock one now as this has actually come up lately using early (hollow) shafts in late-style lube geartrains
Are you using a Torrington-Bearing between the Forward-Hub and the Direct-Drum?
Are you using a Torrington-Bearing on the Center-Support to support the Direct-Drum?
The Torrington-Bearing must be Shimmed to lift and support the Direct-Drum off of the stock Sun Gear Shaft.
If you look closely, you can just make out the Torrington-Bearing (as the black side is facing upwards).
When built this way, I shorten the Intermediate-Shaft 0.050" - 0.075" at the front end.
When changing the Thrust-Path, I do not want the Intermediate-Shaft making contact and transferring thrust down further in the Unit.
I want everything in the front end of the Unit to transfer all the thrust into the Center-Support, and not further back.
Last edited by vorteciroc; Jun 12, 2021 at 03:58 PM.
If you want it stopping at the center support, you must be modifying the center support for a bearing?
I cut a pocket in the center support and let the direct drum rest against that bearing rather than the shoulder of the sun gear tube.
A bearing between the fwd hub and direct drum is great for their differential speeds in 1st and 2nd gear, but the thrust will still get transferred to the rear geartrain via the sun gear tube.
I also will use custom made Sun-Gear Shafts that have a slight press-fit into the Direct-Drum, that are shortened as needed to prevent additional thrust into the Torrington-Bearings below the Sun-Gear.
Everything in combination will reduce as much as possible, the Front-Section placing additional thrust/ Force into the rear-Section.
Hahaha, the old green loctite trick! Back in the day some builders use to loctite the sungear tube shaft onto the direct drum to keep it running center line. CK performance then started manufacturing billet sungear tube shafts with a press fit. He also added a bushing to the direct drum to to center line the forward hub with bearing and a bearing in the center support. Looks like he did find a market for it.
ive done the full roller treatment on my new personal transbrake transmission, but I dont intend to do it on customer units. people dont like to pay for machine time.
I'll just have to keep an eye on mainshaft OAL. As far as i can tell that was the only mechanical issue with this unit after 100's of launches on the brake. (well the IM steels were spotted too but probably unrelated)
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4L80e carnage 
