Brandt Posted September 27, 2013 Share Posted September 27, 2013 I have had this truck for 8 years and have put very little into it. Next summer I may be working it daily and need to make it more reliable. '91 RD690S Maxidyne EM7 300 4 VH 12 speed TRTXL 1070B Mack diffs w/ 4.42 gears (CRDPC92, CRD93) Camel Back Double frame The syncro in the trans is GONE. Going up or down - everytime I move the button on the stick it grinds. It is particularly bad when I move the button to go down and the stick to go up a gear. My options are to replace it with a Mack 18 spd, replace it with an Eaton 18 spd (and have a new drive shaft made) or rebuild this trans. I like the Eaton idea as it will get me better fuel mileage, but the Mack 18 spd is built a bit stronger. Your thoughts?? I need more HP. I got spoiled with a 60 series 500 HP and now feel the Mack is under powered. I will be adding a Pittsburg Power muffler and maybe a turbo this winter. Any other hod rod ideas?? I want to pull a pup with this and will be grossing 92,000 lb. While a 300 may get me by in Ohio, it will be a real struggle at 5000' in the "hills" of WY and MT. My jake brake is weak. The truck didn't come w/ this, I added it shortly after I bought the truck. I got the parts from a salvage yard in IL. I was told that there is a kit to increadse the oil pressure and get a stronger jake brake. I have no other info. If anybody knows how to get more braking power out of my jake, I am very interested!! I also need several small parts. I recently blew a steer tire and it wiped out my passenger side headlight assy. The hood is mildly cracked but I can work with it. Other than the dealer is there a place that has Mack parts like this?? Aftermarket is OK as long as they are not chineese parts. Sorry for the lengthy post, but I always had the $$ to pay a mechanic when I was running over the road. Now that I am semi-local I want to do more myself as well as I don't have the money to pay somebody else. Quote Link to comment Share on other sites More sharing options...
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