[OT] Synthetic Tranny Fluid

[Ron Schroeder]

Hi,

Seen this problem many times but not just with synthetic.  When you put a
GL-5 oil in a tranny that specs a GL-4 oil the syncros will not work as
quickly because the GL-5 oil has too much EP addative.  I have seen several
trannys ruined by someone putting in the ""better"" GL-5 oil.  I have found
Redline MT-90 synthetic oil to shift better than non synthetic oils.  The
MT-90 is a GL-4 oil specifically made for transmissions with syncros.  Some
GL-5 oils in addition to being too slick will also corrode the syncros.  

Putting a GL-5 oil in a diff or other gearbox without syncros that speced
GL-4 is ok and may improve its life but don't do it with a tranny.

Ron
'73 military troop carrier with GL-4 in the tranny and GL-5 everywhere else.


At 05:06 PM 8/28/01 -0400, you wrote:
<snip>
>FWIW, one of my buddies using the Manual Synthetic fluid, went back to the
>non-synth because "it was too slick." He claimed he could not speed stick
>the 4 speed in his vette at the drag strip because there was too little
>friction to get the gears matching speeds, apparently leaving the trans in
>neutral with engine going you know where. Making no changes except to go
>back to the non-syn "cured" the problem. YMMV.


Ron Schroeder
WD8CDH
E. E. S.
wd8cdh at bnl.gov
rjs at bnl.gov
ron at 112motors.com
631 344-4561 Day
631 286-5677 Nite
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