75gmck25
Full Access Member
- Joined
- Oct 13, 2016
- Posts
- 2,235
- Reaction score
- 2,152
- Location
- Northern Virginia
- First Name
- Bruce
- Truck Year
- 1975
- Truck Model
- K25 Camper Special TH350 NP203
- Engine Size
- 5.7
It is possible that your truck has 4.56 gears, since it’s a one ton.
Changing from 16” to 17” rims is not the key measurement. You need to look at tire height, not rim size. In most cases a 33” tire will fit with no mods (originals tires were about 31”), and 35” will fit with only a 2” lift.
For a transmission, make sure you consider the transfer case adapter spline count. For example, if it was originally a TH400, it may not be a direct swap to a 700R4, but a 4L80 may be fine.
Changing from 16” to 17” rims is not the key measurement. You need to look at tire height, not rim size. In most cases a 33” tire will fit with no mods (originals tires were about 31”), and 35” will fit with only a 2” lift.
For a transmission, make sure you consider the transfer case adapter spline count. For example, if it was originally a TH400, it may not be a direct swap to a 700R4, but a 4L80 may be fine.
