Lucky dogg

Hey all, I have a 1998 Mack rd 688s truck with a 350 etech motor. The truck has 700,000 miles and is an Oilfield truck pulling a semi dump on a highway project on site (oilfields a little slow). The truck was pulling around a corner empty when the driver said it just died. It did have a small fuel leak on the electronic fuel deal under the chrome plate on passenger side. We took the two Allen head screws out, pulled it out of the motor, replaced the o rings and bolts and fuel leak is now stopped but still refuses to start. We also changed fuel filters and check fuel pump and bled all injector lines. The truck will start on ether but quits immediately after. Any ideas what this could be? Please let me know if there is anyone who had this issue and what it might be. Thanks all

I'll keep that in mind for sure thanks for the information. When you say wide geared, are you referring to distance between gears or that you ride them out longer?

Hey all, I have a 1983 Mack superliner I bought at an auction. Someone restored this truck with a new cab, and put air ride suspension on the truck. It has a 350 e-6 I believe. It also has 4:17 gears and my Tire size is 11 r 22.5. I am in the oilfield and dump truck business. I would like this truck to cruise 65/75mph like modern trucks do. Currently top speed is 57mph at 2000 rpms. It currently has a twin stick 1071 I think in it. I have a 2080b now from spare parts. The twin stick is also popping out of high gear constantly so the tranny needs fixed regardless. Can anyone help me? Will the swap work? Will this truck be able to drive down the road and pull a load ok? A local guy told me this idea is suicide for this truck and a huge mistake? All I pull is frac Tanks, a semi dump, drill pipe, and move my d6 Cat once in a while. Please let me know any help is greatly appreciated