What year did Dodge/Cummins stop offering the non-intercooled trucks? Was the intercooler a popular option or was it to pricey? Did they always offer the I.C.? What would have made original owners not opt for the I.C.?

 

from what i herd they all came threw with intercoolers in 91.5 i think i could be roung. but they started doing them for emissions

 

First half of 91 had no intercooler.


I dont think it was ever an option. I could be wrong in that though....

 

It wasn't an option, all trucks built after mid-year 91 were intercooled, also had 7mm injectors, and that was when the a518 automatic overdrive transmission was introduced and 3.07 gears went away. Alot of that was done for fuel mileage as well as to make the truck pull better, with the 3.07's and automatic taking off was a chore and top speed was in the 65-75 mph range.

 

What gears did pre 91.5 have ? what size injecters did they have?

 

9mm injectors. 3.07 gears in the auto's, 3.54 and 4.11 in stick, rumor of 3.07 also available for stick.

 

I know of at least one non-IC truck with a 5 speed and 3.07's in it.....

 

I saw an 89' W-350 5spd that was intercooled, was this a swap? It was a BLM brush truck.

 

The intercooler was swapped in, could have used a factory intercooler, associated plumbing, and radiator. Or something like the Banks technicooler that was offered for these trucks. Hard to tell without actually seing the engine and tubing. We also forgot to mention the IIRC 7.71 gears with an auto in the aircraft tug 89-90's.

 

has any one ever swaped in the 9 mm injecters in place of the 7 mm. why did they use such high gears in these trucks i dont get it.

 

no, the 9mm inj will physically not fit in the 91.5 and newer 7mm head. you can fit 7mm into the older head with some fancy adapters. don't try to stuff them inthere without them....ask me how i know...

 

They used the 3.07 gearing because the automatics behind nonintercooled engines were 727s. stout as could be, but no overdrive. With 3.54 gears, you wouldnt be able to go over 55-60. Top speed 727/3.07 rear for me was 86 downhill in neutral . Now with the Getrag/3.07 combo () Ive had it past 100 to where it took a good 4-5 seconds to come back down.