Tranny Swap Questions

[El 'Jefe]

Will a six speed manual from a 7.3 PSD bolt onto a 7.3 IDI? Also, does anyone know the gear ratios from this trans vs. the ratios from a ZF5 Manual trans...The reason i ask is that if the six speed is strung out a bit farther, i would like to lower my rpms for economy purposes while maintaining the power i would lose with a taller rear end gear.

[osufireman]

Here's what I found out with some searching online and on the forum:

ZF6 ratios
Low 5.79:1
First 3.30:1
Second 2.10:1
Third 1.31:1
Fourth 1.00:1
Overdrive 0.72:1
Reverse 5.23:1

Standard gear ratios on the ZF S5-42: 4x4 and 4x2

Close Ratio

1st Gear:

4.14

2nd Gear:

2.37

3rd Gear:

1.42

4th Gear:

1.00

5th Gear:

0.77

Rev Gear:

3.79 Wide Ratio

1st Gear:

5.72

2nd Gear:

2.94

3rd Gear:

1.61

4th Gear:

1.00

5th Gear:

0.76

Rev Gear:

5.24
The ZF S5-42 main case cast number is “1307”


Standard gear ratios on the ZF S5-47:
Close Ratio - 7.3L Diesel

1st Gear:

5.08

2nd Gear:

2.60

3rd Gear:

1.53

4th Gear:

1.00

5th Gear:

0.77

Rev Gear:

4.66 Wide Ratio

1st Gear:

5.72

2nd Gear:

2.94

3rd Gear:

1.61

4th Gear:

1.00

5th Gear:

0.76

Rev Gear:

5.24 The ZF S5-47 main case cast number is “1317”

As to whether a ZF6 will bolt up to a 7.3L IDI

Here's a link I found on a nother TheDieselStop thread about zf5 to zf6 swap, a writeup that one of the other members did on his swap experience. ZF5-ZF6 swap