One thing of note, you can get your O/D built to your engines Torque.
Cheapest would be a bolt in 2004r. Has a .67 overdrive.
With lock up, can really help with economy, drive ability.
GM used 3.42 with Overdrives as standard in the 90's, 2000's .
The highest you want is a 3.08 If cruising, the 3.08 can really increase your range.
I run a 3.42 with a stage 3, 2004r and lock up, stock rpm converter. Can do spirited driving, and get 80 mph at 1990 rpm.
PAID FOR ITSELF IN 3 YEARS with fuel cost savings.
Can do s
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