Allison Trans. Gear Ratios

[Raptorrider2001]

I was at an aurthorized Allison dealer today and picked up a chart showing the gear ratios of the 1000 series. Don't know if this has been posted here or not.

1st gear = 3.10:1
2nd gear = 1.81:1
3rd gear = 1.41:1
4th gear = 1.00:1
5th gear = 0.71:1
Reverse = -4.49:1

It then listed Ratio Coveage (whatever that is)?
Front = 4.37

[Colorado Kid]

Ratio Coverage is 3.10/0.71 = 4.37

It gives a feel for how "wide" the transmission is, the spread between the highest and lowest ratio. The Allison is VERY wide for an automatic, only the 4L60-E/TH700-R4 are similar.
(4L80-E for example is 3.35)

ZF-6 ratios:

1st gear = 5.79:1
2nd gear = 3.30:1
3rd gear = 2.10:1
4th gear = 1.31:1
5th gear = 1.00:1
6th gear = 0.72:1
Reverse = -5.23:1

Coverage = 5.79/.72 = 8.04 Which is about a wide as manual trannys get outside of big rigs, and yet a slightly taller high and a lower low (particularly in reverse) would be nice. Some of us are hard to please!

[NickLeinonen]

and if you do want to slip in a big rig trans, how about the mack 306g tranny..

1-7.50
2-4.08
3-2.41
4-1.50
5-1.00
6-0.71
R-8.84

10.50:1

[Colorado Kid]

That sounds about right, but then I'd miss the tight 4/5 split.