SOUTHERNAUTOTRANS Posted August 1, 2013 Share Posted August 1, 2013 I HAVE A T2090 THAT GRINDS WHEN HIGH RANGE IS SELECTED.REMOVED COVER ON TOP OF TRANS AND CHECKED THE ACTUATOR FORK AND COMPONENTS AND ALL SEEMS GOOD.ANY INPUTS AS TO HOW TO APPROACH THIS THING? Quote Link to comment Share on other sites More sharing options...
keg1 Posted August 2, 2013 Share Posted August 2, 2013 I have a Fuller 9 speed in my Superliner that does the same thing sometimes. Quote Link to comment Share on other sites More sharing options...
Superdog Posted August 2, 2013 Share Posted August 2, 2013 synchronizers going bad Quote Link to comment Share on other sites More sharing options...
RFCDrum Posted August 3, 2013 Share Posted August 3, 2013 Yep synchro Quote Link to comment Share on other sites More sharing options...
turckster Posted August 3, 2013 Share Posted August 3, 2013 There are 2 types of 2090 transmissions, long box and short box. Short is synchronized and long has a sliding clutch. If it has the sliding clutch then yes, it will grind. Low range is for 1st, 2nd and 3rd only. With the rear lid off, make sure the fork pinch bolt is tight-these are notorious for being loose. Make sure the air psi to the range cyl. is same as truck air psi. You can see the high range clutches and range sliding clutch teeth with the rear lid off, if there is chipping/damage to the sliding clutch teeth or the clutch discs look burnt/have alot of slack then its bad. If you choose to fix it yourself, it will be a chore to repair. It requires special tools to remove the synchronizer in chassis. Some dealerships let customers borrow tools.If, by chance, this has just the sliding clutch, removal of the transmission is your only option for repair. There are no tools for in chassis removal of the rear section on a non synchronized trans. good luck Quote Link to comment Share on other sites More sharing options...
Challenger Posted August 3, 2013 Share Posted August 3, 2013 Synchronizer failure. Mack came out with new updated/improved parts that are suppose to prevent premature synchro and related gear failures. Lately we have been replacing trans for synchro failures. Part prices are up and reman trans prices are down. If you take it to a dealer I would price the repair and compare it to the price of replacing and make your decision. Parts guess about $2500 labor guess $1000. Quote Link to comment Share on other sites More sharing options...
oilburner Posted August 7, 2013 Share Posted August 7, 2013 I drove one once that done the same thing but if you did not pre select it pull it out of gear then put it in high range it would not grind. I like the nine speed Mack. It has a good low and a overdrive that will put you in the clouds. Quote Link to comment Share on other sites More sharing options...
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