Highest Gears avaliable for Dana 60/70?

[ARAMP1]

I've tried searching the forums and couldn't find this. What is the highest (numerically lowest) gear set that you can get for a Dana 60 and Dana 70?

Just doing some googling, I've found 3.54 for each. Anyone know of anything higher (say around 3:1)?

 

[tarussell]

Dana 61's offer a 3.00:1 gear but I think that a D60 only goes down to 3.54 and some odd variants of the D70 go as low as 3.07.


Tom

 

[ARAMP1]

Cool. That's what I thought. Thanks. Need the front and rear to match.

 

[tarussell]

Cool. That's what I thought. Thanks. Need the front and rear to match.

Easiest way that I can think of would be to find donor axles from a 1989-1990 Cummins equiped Dodge W250/350 that came with a 727 tranny . They came with 3.07's D60/70 combo .


Tom

 

[ARAMP1]

Easiest way that I can think of would be to find donor axles from a 1989-1990 Cummins equiped Dodge W250/350 that came with a 727 tranny . They came with 3.07's D60/70 combo .


Tom

So then you think I should be able to find just the gears?

 

[tarussell]

So then you think I should be able to find just the gears?

Sure - the gears are available but the question is will they fit the housings you want tp put them in ???
In some cases you can mix-n-match carriers and gears in certain housings but not in all cases - it all depends on what you got .


Tom

 

[ARAMP1]

Well, I'm pretty sure that 4.10 and lower are all the same carrier. I have 4.10s now. You'd think that they'd fit.

 

[tarussell]

Well, I'm pretty sure that 4.10 and lower are all the same carrier. I have 4.10s now. You'd think that they'd fit.

NO - I do not know what you have as far as axle housings . The carrier should be the same but it is the pinion offset that matters . The housings are casted differently for the econo gears,

What are you working with ? Tom

 

[ARAMP1]

What are you working with ?

Front/rear Dana 60/70 out of a 1990 V3500 dually. I'm going diesel and need some better gearing.

 

[nvrenuf]

Like Tom said, the 3.07 stuff is for specific housings. He can answer better than I but I imagine that (if they're available for the rear) 3.54's would work in your axles.

 

[tarussell]

Front/rear Dana 60/70 out of a 1990 V3500 dually. I'm going diesel and need some better gearing.

O.K. You have got an HD 70 and there ain't no such gear for that housing in the 3.07 range ( might be possible to figure out a way to use HD70-3 gears but I have never thought much on if you could or not ) .
Seems like 3.54's would be just fine and a 3.XX gear would not be worth it and make for some un needed strain when loaded .
I understand about keeping the RPM's down for the low RPM range of a diesel motor but give it enough gear to do its job.
ARe you using a GM/Detroit motor or are you going with another make ?

Tom

 

[ARAMP1]

I'm using a 4-71 Detroit two stroke motor, so I'll be capped out at about 2200rpm. A guy I know who built up the same truck kept his 4.10s but used a brownie box mounted in backwards so it was effectively a .50:1 overdrive. It drove around great with effectivly a 2.05:1 rear ratio. I've though about doing the same, but was looking at how high I might get without it.

I guess 3.54:1 would work. Using a calculator, at 70 mph with a 37 inch tire and .80:1 overdrive, it's 1800 rpm.