Sidekick Gearing
Here is a table that shows the various gearing combinations with this setup. Thanks to Mike Strickland for the template spreadsheet that he provided for this set of tables. These numbers are based on the following configuration:
High Range Table
|
Gear
|
Overall
Ratio |
5 |
10
[mi/h] |
20
[mi/h]
|
30
[mi/h] |
40
[mi/h]
|
50
[mi/h] |
55
[mi/h]
|
60
[mi/h] |
65
[mi/h]
|
|
1
|
21.510
|
1063
|
2126
|
4251
|
6377
|
—
|
—
|
—
|
—
|
—
|
|
2
|
11.468
|
567
|
1133
|
2267
|
3400
|
4533
|
5666
|
6233
|
—
|
—
|
|
3
|
8.381
|
414
|
828
|
1657
|
2485
|
3313
|
4141
|
4556
|
4970
|
5384
|
|
4
|
5.890
|
—
|
582
|
1164
|
1746
|
2328
|
2910
|
3201
|
3492
|
3783
|
|
5
|
5.095
|
—
|
503
|
1007
|
1510
|
2014
|
2517
|
2769
|
3021
|
3273
|
Low Range Table
|
Gear
|
Overall
Ratio |
0.5
[mi/h] |
0.75
[mi/h] |
1
[mi/h] |
2
[mi/h] |
3
[mi/h] |
4
[mi/h] |
5
[mi/h] |
7.5
[mi/h] |
10
[mi/h] |
|
1
|
91.204
|
451
|
676
|
901
|
1803
|
2704
|
3605
|
4507
|
—
|
—
|
|
2
|
48.624
|
—
|
—
|
481
|
961
|
1442
|
1922
|
2403
|
3604
|
4805
|
|
3
|
35.537
|
—
|
—
|
—
|
702
|
1054
|
1405
|
1756
|
2634
|
3512
|
|
4
|
24.974
|
—
|
—
|
—
|
494
|
740
|
987
|
1234
|
1851
|
2468
|
|
5
|
21.602
|
—
|
—
|
—
|
427
|
640
|
854
|
1067
|
1601
|
2135
|
The 4.240:1 low range is obtained through the use of Calmini’s new JI platform transfer case gear set. These are still prototype gears at this time, I’d expect Calmini will be selling these to customers soon as they have added a section to their website describing the gear set and displaying a picture of the gears themselves.
There is an alternative set available through an Australian company (http://www.rockhopper.com.au) but I will try the Calmini gears as they will be easier to get since they are local to this continent. I expect the Calmini gears will be cheaper as well, even after factoring in the U.S. to Canadian dollar exchange rate.
The fifth gear ratio shown in this table is also lower than the ratio that is currently in my truck. This lower ratio was apparently available in the short wheelbase JI trucks. I still have to confirm this as a fact but it is not a show stopper if it is not available.
The intent was to get the RPMs up a little higher so that the engine is at the root of the power band when cruising at highway speeds. I’d rather tip into the gas and get some appreciable accelleration on four lane highways as opposed to down shifting. The higher RPMs may be a little buzzy in the interior but with some strategic use of sound deadening materials this shouldn’t be a big deal.