Freeway driving: TJ doesn't want to go faster than 75 mph

[Pcleaners2]

Anyone experience that once you get up to around 75mph with your tj that it doesn’t really go any faster or have any more “getup” when flooring it. I have a 5sp 4.0
Just wanna know if this is a normal thing or just mine ?!

 

[Jerry Bransford]

What size tires and what ratio gears are inside your axles?

 

[toximus]

75mph is a point where the throttle doesn't have much more left without a long distance. Ie. 75 to 80 takes a bit longer than 70 to 75.

 

[Pcleaners2]

75mph is a point where the throttle doesn't have much more left without a long distance. Ie. 75 to 80 takes a bit longer than 70 to 75.

3.73 31” tires

 

[Pcleaners2]

Tune up has been done already - healthy engine

 

[tworley]

Shoot I caught myself going 90 a few weeks ago. My speed sensor has either failed or the nut needs torqued to spec on the output shaft of the tcase (speedo is all over the place). It seemed to be sticking near 70 but it felt fast so I turned on my gps, clocked myself going 90.

 

[Pcleaners2]

wow i dont think i could get up to 90 unless i hold down for a bit

 

[Tray Burge]

I must have a really healthy 4 cyl. because I can hit 75 easily on the highway?

 

[Pcleaners2]

What about from 75-80
If going uphill ? Can you honestly say it has “get up”

 

[jodomcfrodo]

Maybe my TJ is just junk, but asking a brick with 180HP to accelerate going uphill at 75 mph just seems like a bit much to me.

 

[Pcleaners2]

lol

 

[Pcleaners2]

Mine doesn’t accelerate uphill unless I drop in 4th gear but rpm will be so high
4.0

 

[jodomcfrodo]

Mine doesn’t accelerate uphill unless I drop in 4th gear but rpm will be so high
4.0

Are you seriously expecting your TJ to accelerate going uphill in 5th gear? You're going so fast uphill that you're winding out 4th gear?

 

[Pcleaners2]

Well I don’t do that unless I need to pass a car

 

[Pcleaners2]

Maybe I need 4.10s

 

[tworley]

Dont be afraid of high RPMs, I can cruise all day at 3k

 

[jodomcfrodo]

Maybe I need 4.10s

What you probably need is a turbo LS swap and one hell of an insurance policy.

I'd maybe just take it a bit slower and lower your expectations. A TJ is not a rocket ship.

 

[Pcleaners2]

True well it’s been in the garage for a year . Trying to clean out the pipes

 

[Jamison C]

This is my uphill cruising speed/RPM. I just drop it into 4th until the terrain levels out. Handles the revs just fine.

 

[Rob5589]

Did you adjust your speedometer for the larger tires?