No worries, its not posted... until NOW :
Aisin AR5 Transmission
1st:3.75
2nd:2.26
3rd:1.37
4th:1.00
5th:0.73
R:3.67
4L30E
1st: 2.86
2nd: 1.62
3rd: 1.00
4th: 0.72
Rev.: 2.00
To answer your question, the OD is about the same but think about all the extra power you'll have going in reverse!