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Have been reading alot, but this is my first post. Would like to change 3.42/ G-80 to a 3.90 and Trutrac. Have noticed most are 3.73 or 4.10 in this range, and was wondering if it was a tuning issue or are 3.90's just unpopular ? My cam is stock but I plan on a mild upgrade in the near future.
Thank you in advance.
I was going to go with that same gear swap and agonized over it for months before going to the 3.73s. BUT, I wanted to do this for towing a camper. I wound up getting 2 255/65/16 tires along with the gear change. when I plan on towing the camper I just swap the 65 series tires from the front to the back. The 1" difference in diameter brings me very close to the rpms I would be turning with the 3.90s. When I'm not towing I don't pay a penalty in mileage. It works fine for me.
Bob
3.90s are a good in between gear but they are more money than 3.73s or 4.11s. $50-60 more.
Im changing my gears from 3.42/g-80 to 3.90 trutrac! ha I'll let you know how it is.
Great ! Good luck with your install. I'll be watching.Quote:
Originally Posted by wholeshot
I plan on going from 3.42 to 3.73 soon. Should make a bit of a difference.
3.42 to 3.73 isnt worth it imo...i did it (swapped rears, cuz new one had a locker) the couple hundred rpm isn't enough to really help