I know the MTAs have different tolerances inside them.(At least from what others have posted on here.)
You CANNOT run 90 wt in an MTA,400,450 !!!!
It would be the equivilent of putting 90 wt in an automatic trans!Smoke the T/A
HYTRAN is NO comparison to gearlube as an ACTUALL "clinging" gear lube.(like a 90 wt 140 weight grease.) You use HYTRAN because you HAVE to in certain situations.
The WHOLE reason for running HYTRAN (AKA; A variation of ATF) is to keep from destroying the planetarys.Those planets wont live in gear grease.You couldnt even shift them in 90 wt.(try that on a 40 deg or less day!) Also,in newer tractors,90 wt will not work as hydraulic fluid either.
The ONLY other factor is the LOW RPM of the final drive.If the rear axles were a "high speed" rear end like a car,they wouldnt make it.
Newer cars do use ATF in their transmissions,but the tolerances are different.
End of story:If it doesnt have a T/A,DO NOT use HYTRAN! Unless you live in ALASKA and the tractor usually runs in -20 weather all the time.
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