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Losing power

Discussion in 'Wrangler TJ (1996-2006)' started by Bus driver, Jan 16, 2017.

  1. Jan 16, 2017 at 2:40 PM
    #1
    Bus driver

    Bus driver [OP] Member

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    Ricardo
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    2000 wrangler
    3.5 inch lifted
    Hello everyone I'm new to jeep and just bough 2000 Wrangler 3.5 inch lifted allready and had small tires i decide to swap to a 33 and it seems like it loses power. The car doesn't go over 62mph on the highway.

    Can anyone advise me on why that happened? Thanks in advance.

    Almost forget I have a 4 cylinder engine, automatic tranny
     
    Last edited: Jan 16, 2017
  2. Jan 16, 2017 at 6:58 PM
    #2
    C2T

    C2T Well-Known Member

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    Richard
    Helena, Montana
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    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    What size tires did it have on it and what is your axle gearing?
     
  3. Jan 16, 2017 at 7:09 PM
    #3
    Bus driver

    Bus driver [OP] Member

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    3.5 inch lifted
    The previous tires were 255/55R18 and I think the Jeep it's stock the previous owner looks like made some minor changes
     
  4. Jan 16, 2017 at 7:10 PM
    #4
    C2T

    C2T Well-Known Member

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    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    Essentially, when you changed to larger tires, you changed the gearing of the Jeep. With the small 2.5 and a 3 gear auto, these changes can make a MASSIVE difference with what may seem like a moderate change in tire size.
     
  5. Jan 16, 2017 at 7:13 PM
    #5
    Bus driver

    Bus driver [OP] Member

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    What will be you suggestion to downsize tires or do some other modification
     
  6. Jan 16, 2017 at 7:18 PM
    #6
    C2T

    C2T Well-Known Member

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    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    Ricardo,

    That depends upon what YOU want to do. You could take the tire size back down or regear to make up for the difference.

    Do you know what your current axle gear ratio is?
     
  7. Jan 16, 2017 at 7:22 PM
    #7
    C2T

    C2T Well-Known Member

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    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
  8. Jan 16, 2017 at 7:23 PM
    #8
    Bus driver

    Bus driver [OP] Member

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    3.5 inch lifted
    Idk like I say before I'm new to a Jeep
     
  9. Jan 16, 2017 at 7:44 PM
    #9
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    The original tires on the 2000 Wrangler were 30" tall and a 4.10 gear ratio I believe. If you went up to 33" tires you will need to have 4.56 gears to have the same factory ride. Here is the formula:

    New tire X Old gear ratio= New gear ratio
    Old tire

    33 X 4.10=4.51 Round up to 4.56 gears
    30

    You might consider going to 4.88 gears just for a little extra Umph. I don't think it will hurt your top end fuel mileage much, and you'll have a lot more get up and go from stop.
     
  10. Jan 16, 2017 at 7:48 PM
    #10
    Bus driver

    Bus driver [OP] Member

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    2000 wrangler
    3.5 inch lifted
    Thanks a lot guys I'll keep in touch I want to learn all about jeeps
     
  11. Jan 20, 2017 at 7:15 PM
    #11
    Bus driver

    Bus driver [OP] Member

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    2000 wrangler
    3.5 inch lifted
    Thanks a lot for you advice offgrid thanks also to c2t my jeep it's at the shop it had 3.73 and upgrading to 4.88 I will post some pictures when it's done thanks again guys
     
    C2T likes this.
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