I know this has been asked a few million times, but alot of us 1st gen owners have never done this and it seems that is a good thing to do. What needs to be done? and where? Pics would be helpful to most I'm sure. I will be doing this shortly, and I'm sure others will too if the "old experts" here can help us along the way. My old girl is a 91.5 intercooled 5 speed with 4.10 gears and 136k on the odo. She will get to about 78-79 on the highway. Thats fast enough for me, but I think this would help all around the speed range. (I also run 265/75/16 tires, if anyone cares.) Thanks in advance for the help.
P.S. When I do this I will take pics and give a write up on my findings along the way.

 

Alright, I guess I'll just use my vast wisdom and try to tackle this one on my own. I'll search some more.

 

triton, To adjust linkage, find the throttle rod that connects to the throttle arm at the pump and bellcrank/throttle cable area. I don't know how to load pics on here, or I would show you.

The throttle rod has two 10mm left handed nuts. Have someone or something push the go pedal to the floor in the cab. Watch the throttle movement. See if it hits the stop screw/high idle screw on the pump. If not, if needs adjustment. If it hits it, and looks as though you have more travel, but the the screw is the limiting factor, it just has a 10mm nut holding it. Loosen the nut, then back out the screw to where ever you want. I prefer to back it all the way out. Then adjust the throttle rod for the most movement. By loosening the two 10mm nuts on the throttle rod, you can lengthen or shorten the rod by turning the two throttle rod ends. Bet pics would be nice eh??

Be careful the stock throttle rod ends are plastic and break easily. There is an upgrade kit with new metal ends and a new rod, available from the dealer or Cummins for ~$22. Part number is in the tech facts.

Once you get all the movement/travel you can at the pump, then you can look to the pedal in the cab. You can unhook the cable at the pedal, place a couple washers around it, to bring the pedal off the floor. Then when you want more, you can remove the pedal assembly and use some heat and bend the pedal up off the floor even more.

 

bgilbert, thanks for the insight, it gives me a good starting point. Now I just need to get the old lady to go out and push on the skinny pedal for me (harder than it sounds). Thanks again, I'll give it a go.

 

How about a couple of bricks? Hopefully the old lady won't get jealous.

 

She would get jealous, plus I would like to be able to watch the range of motion as it is pressed and released.... BUT it may end up coming to that!