CarsRFun

* Tremec Transmissions
Borg Warner transmissions are now owned by Tremec Corp, however, the design
remains unchanged between the two transmission lines. Borg Warner
transmissions, for the most part, use a single rail gear selector and carbon
fiber lined steel synchro rings, where the Tremec transmissions have a
single rail that selects and moves three shift rods internally. These three
rods have spring loaded detents that make the transmission feel notchy
during shifting. Instead of carbon lined steel synchro rings, the Tremec is
built with solid bronze synchros with no linings. It is for these reasons
that the Tremec does not like to shift well above ~6,500rpms unless
modified. There is a way to improve the shifting but is only used for drag
racing when down shifting is not needed.

Thanks
jason

thesource

iTrader: (60)

Its right on ......... but where are you going with it ?

calhoon

iTrader: (6)

Its pretty limited and not very accurate. If you are talking about the older TR3550 Tremec 5 speed, the statements are valid.The RPM limitations of brass alloy synchronizer blocker rings is nearly accurate. They will shift above 6500 but won't do it in a performance fashion. 5500RPM is a more accurate performance shift limit. There are many modification tricks that can improve this performance( can be applied to any synchronizer).Tremec has newer designs with "modern" blocker ring materials - carbon particle/ scintered bronze/ even plastic compounds. The new materials are designed to reliably shift in the 7200 RPM range. These are regularly used at the drag strip for 8200RPM shifts.
BTW It was Tremec that converted all T56 s to use the carbon -particle lined( carbon fiber is an incorrect term) synchronizer blocker rings. Borg-W arner had used the grossly inferior organic paper lining in many T56 applications for years.