Let me know, if this does work I will continue on. I can go on and on with the diagnostics but start with these things first and download the manual. Peterbilt 379exhd with 10' Straight Pipe Stacks busting Jakes and Shifting through the traffic in Montego Bay.525hp Red Top N14 Celect Plus Cummins with Supe. On my 18spd the filter was plugged up so after cleaning that it worked fine, if that little filter is plugged up and you clean it better check your air dryer to find out whats up. On the big rubber ones only one end will have a swivel fitting for removel they can be a pain. This is a 1981 Peterbilt 359 with a big cam 2 cummins and a 12513 3 position splitter 13 speed (lo(direct), direct. If you need to switch the spaghetti lines look at the fittings real close, on the newer ones you will have to push the sleeve down that the line goes into, once you have that pushed down hold it down and pull the line out. This is a 1981 Peterbilt 359 with a big cam 2 cummins and a 12513 3. Try out those few things first before you tear into anything else. I had it swapped in coming from a Eaton fuller 8LL. Initially it was still operating as a 8speed where I had to flip the splitter and the high/low to engage the high gears. if you are not near a dealer to get a new one spend some time with some brake cleaner and clean it up real good and put it back it. I am having an issue with the high side of my Eaton Fuller RTO 14613 (used), 13 speed. Next on the back of the trans there is a regulator, on top of the regulator there is a nut I believe is 1 1/2 inch socket, doing this from memory, it is right on top and what it is, is a big cap with a filter underneath of it inside a small well. Check the manual and it will have a diagram for these also, check them out to make sure they haven't been switched. As writer Adam Belz of the Star-Tribune wrote, regional and local trucking companies that use older trucks may hold on to manual transmissions longer, but the days of a trucker gear-jamming down the interstate in a 36-speed are coming to an end. Next, there are some large rubber hoses that look like they are running all over the place on the trans, they are no big deal either. Make sure there is not air leaking around the knob itself, these knobs are not to big of deal to work on but if you do not like tiny o-rings and springs a new generic knob can be purchased for under $100 if yours has a problem. There will be one that is not hooked to anything and that is the vent. The manual will have the airline diagram in it, make sure all of these are in the correct position and not kinked or leaking. 18 Speed, Sleeper, 13,200lb Front, 40,000lb Rears, Sliding 5th Alum Wheels, Air Ride Susp, Dual Fuel Tanks, Recent Radiator, Recent Compressor, Factory 285. Lets start at the top, a 13spd shift knob has a red splitter button, trace these lines down to the fittings on the trans. Browse a wide selection of new and used PETERBILT 389 Trucks for sale near you at Login Dealer Login VIP Portal Register. There is a downloadable manual on google that has trouble shooting guide in it.
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