Red Line
Peanut Butter
Full Time Jeeper
- Posts
- 2,591
- Media
- 37
- Resources
- 1
- Thanks
- 15
- Location
- Boerne, Texas
- Vehicle(s)
- 1979 Jeep CJ7 TH400 Automatic 258 I6 Quadratrac Amc 20 rear & Dana 30 front, 32 x 11.5 x 15 tires. Currently a Complete Custom Rebuild in progress.
Also I own a 2001 Jeep Cherokee, White, all stock with 4.0L. automatic, and police package. Best part of that is it came with leather seats! This package also has the NP242 Transfer Case, 8.25 rear end, and trailer towing package.
Keep in mind that I'm not planning to go drag racing or any such thing!
I'm just wondering what the red line is for the AMC 258 i6 / 4.2l and 4.0 engines.
I was going through a gear calculator and got curious.
My best guess was 3400 to 3500 rpm, but I'd like to hear from the experts here. 



