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Tire Size...?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by jimmup, Feb 26, 2002.

  1. jimmup

    jimmup Registered Member

    Oct 16, 2001
    Likes Received:

    I am currently running 33-inch BFGs with 4.10 gears and a th-350 tranny. I am finding that at roughly 55 to 60 mph I am turning around 3,000 rpms. This seems kind of high and I don't want to damage my motor, etc...! Anyway, my questions are as follows:
    1) How many rpms can I expect to drop at say 60 mph by switching to 35 inch tires?

    2) I have a 4-inch lift + 1-inch off-raod design lift shackles in the front and have pretty good clearance with my 33s. Can I squeeze 35's on my Jimmy without any problems (i.e. rubbing)?

  2. ntaj*ep

    ntaj*ep 1/2 ton status

    Feb 4, 2002
    Likes Received:
    Evergreen state
    jimmup, I also had a 4" lift w/4.10s and 35" BFGs, my only rubbing, on the street was at the leading edge of the rear fenders. I only had to cut about a quarter of an inch. by six inch. piece out. Now as far as RPMs are concernd, with the same drive train as yours and 35s I was at about 2800 at 60, the diffrence between 33s & 35s (as far as BFGs) is not that great. My solution to that among other problems was to install a 700r4 trans. I'm now at about 2100rpm in lock-up at 60. But soon I'll be back to the 3000rpm range with (hopfully) 37" tires and 4.56 or 4.88s.

    The Red Beast
  3. Triaged

    Triaged 1/2 ton status

    Feb 21, 2001
    Likes Received:
    CA (LA/OC area)
    <a target="_blank" href=http://www.4lo.com>www.4lo.com</a>

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>

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