ducatijay Posted September 25, 2010 Share Posted September 25, 2010 got a '93 ch with a eaton 9spd. just bought it a couple of weeks ago. transmission shifted fine until about 3 days ago. now everytime i click onto the high side (4th to 5th) it makes a grinding noise then it clicks in. no matter how i shift it it stil grinds. any ideas? a friend of mine said it might be a syncro. i'm hoping i can make some kind of adjustment.... Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/ Share on other sites More sharing options...
fjh Posted September 25, 2010 Share Posted September 25, 2010 got a '93 ch with a eaton 9spd. just bought it a couple of weeks ago. transmission shifted fine until about 3 days ago. now everytime i click onto the high side (4th to 5th) it makes a grinding noise then it clicks in. no matter how i shift it it stil grinds. any ideas? a friend of mine said it might be a syncro. i'm hoping i can make some kind of adjustment....Your friend is correct. Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64222 Share on other sites More sharing options...
theakerstwo Posted September 25, 2010 Share Posted September 25, 2010 Also when you get the synchro replaced also check if its a air ride the air bag height cause if the rear ends have a incorrect ujoint angle it can break the pins in the scychro. In fact that is about the only thing that breaks the pins. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64225 Share on other sites More sharing options...
peterj Posted September 26, 2010 Share Posted September 26, 2010 When we took the back off my 9sp , to convert to 13, the pins were laying in the bottom. We think it was caused by the driveshaft spline being FROZEN solid. Really had to be beaten to move it to get it out. It shifted up ok , but down, almost had to stop, the it had a LOUD clunk. Quote peterjhttp://forums.aths.org/Instantforum2010/topic72786.aspx57 mack h67 Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64258 Share on other sites More sharing options...
ducatijay Posted September 26, 2010 Author Share Posted September 26, 2010 Also when you get the synchro replaced also check if its a air ride the air bag height cause if the rear ends have a incorrect ujoint angle it can break the pins in the scychro. In fact that is about the only thing that breaks the pins.funny you should say that, i blew a bag on the highway drove it for about 2 miles to parking area. is it hard to change the synchro? can the transmission stay in? Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64276 Share on other sites More sharing options...
techdog68 Posted October 2, 2010 Share Posted October 2, 2010 funny you should say that, i blew a bag on the highway drove it for about 2 miles to parking area. is it hard to change the synchro? can the transmission stay in?[/quote]Yes you can leave the trans in and it is not an easy job to change the syncro but there are some things to be aware of . You need to mark the gears and 'time' them correctly or you will have big problems ,and you must shim the countershafts to get correct end play. If you go to Eatons web site you can get all the info you need as well as an electronic parts catalogue and any updates for your trans as well . Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64631 Share on other sites More sharing options...
ducatijay Posted October 2, 2010 Author Share Posted October 2, 2010 just got a price of $1400-$1800 to fix it. you guys think that's a little high? anyone have an idea how much it would be around to convert to a 13spd? i looked on roadrangers website and it looks like the conversion kit has an updated synchro included. maybe i can kill two birds with one stone............. Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64648 Share on other sites More sharing options...
theakerstwo Posted October 2, 2010 Share Posted October 2, 2010 just got a price of $1400-$1800 to fix it. you guys think that's a little high? anyone have an idea how much it would be around to convert to a 13spd? i looked on roadrangers website and it looks like the conversion kit has an updated synchro included. maybe i can kill two birds with one stone.............You need to start with a direct drive 9 speed or other wise you would end up with a RTOO. double over drive.big time over drive. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64649 Share on other sites More sharing options...
ducatijay Posted October 6, 2010 Author Share Posted October 6, 2010 THE MODEL # IS RTX14709HANY IDEA OF THE COST OF CONVERTING IT???? THANKS Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64882 Share on other sites More sharing options...
theakerstwo Posted October 6, 2010 Share Posted October 6, 2010 THE MODEL # IS RTX14709HANY IDEA OF THE COST OF CONVERTING IT???? THANKSThat is a o/if a kit is to be had.d trans. Go to the eaton website and check to see Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64887 Share on other sites More sharing options...
Bollweevil Posted October 7, 2010 Share Posted October 7, 2010 got a '93 ch with a eaton 9spd. just bought it a couple of weeks ago. transmission shifted fine until about 3 days ago. now everytime i click onto the high side (4th to 5th) it makes a grinding noise then it clicks in. no matter how i shift it it stil grinds. any ideas? a friend of mine said it might be a syncro. i'm hoping i can make some kind of adjustment.... I have encountered the same problem, on a high mileage transmission, that was due to badly worn splines on the main shaft and auxiliary drive gear. Have you ever noticed a little sticker beside the shift pattern sticker, that say's, 'Do Not Change Range While In Reverse"? Doing so can damage the sync. the least of which, is to throw the springs out of the assembly. Quote Link to comment https://www.bigmacktrucks.com/topic/15894-eaton-9spd-grinds-clinking-on-to-the-high-side/#findComment-64915 Share on other sites More sharing options...
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