Hi All
Does anyone know what gear ratios were available in 1984 in a 1 ton with a cummins?

We put one in a old ambulance and are trying to match the rear gear ratio.

 

Here is a video on how to do it...Mark

 

Cummins motors where put in Dodges from the factory starting in '89.
'89-'93 1 ton Cummins truck gearing choices are 3.07, 3.54 and 4.10

 

If it has overdrive, put 3.55 in it. If it doesn't have overdrive, put 3.07 in it

 

Run 410's ? won't hurt sound's like it's a 4x4 I would run 410's and big tires

 

The engine is actually in a old Ford Ambulance that we use as a parts vehicle now. It also hauls a Modified race car in a 26' enclosed trailer. So based on what you all have said I am leaning toward the 4.10 but will have to figure out what the RPM will be at 65 with at 1 to 1 final on the trans?

 

well what size tire are you going to run ? give me that and I can give you a better idea of RPM . example is 410's with 1-1 ratio with 37 in tall tires rpm's at 65 are roughly 1800