Author Topic: TJ RPMs??????  (Read 2153 times)

0 Members and 1 Guest are viewing this topic.

GOVT MULE

  • Guest
TJ RPMs??????
« on: August 29, 2010, 05:17:16 PM »
2001 2.5L TJ w/automatic

31" tires, 3.73 gears....At 55 MPH, Im almost at redline on RPMs.

What should my rpm range be at highway speeds? Does anyone else's rev high?

Im curious if it is a transmission issue? It shifts fine, but the RPMs are crazy. 

Blew a 2.5l last month, bout to drop another one in, just want to sort it out.....

thoughts/feedback??

Offline Jeffy

  • Administrator
  • Member
  • Posts: 14934
Re: TJ RPMs??????
« Reply #1 on: August 29, 2010, 05:52:04 PM »
First thing would be to calibrate your speedometer.  If you haven't changed it, it's reading slow.

At 3000 RPM you should be doing 75 MPH.

You can check it at http://jeeptech.com/javaAps/gta.html

Gear     Ratio
1    2.74
2    1.54
3    1.00
R    2.20
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline sharpxmen

  • Chief Squirrel BlowerŪ
  • Member
  • *
  • Posts: 7093
Re: TJ RPMs??????
« Reply #2 on: August 29, 2010, 06:17:30 PM »
2001 2.5L TJ w/automatic

31" tires, 3.73 gears....At 55 MPH, Im almost at redline on RPMs.

What should my rpm range be at highway speeds? Does anyone else's rev high?

Im curious if it is a transmission issue? It shifts fine, but the RPMs are crazy. 

Blew a 2.5l last month, bout to drop another one in, just want to sort it out.....

thoughts/feedback??

sounds like the converter doesn't lock up (i think, not an expert on autos)
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Torch_Ind

  • Guest
Re: TJ RPMs??????
« Reply #3 on: August 29, 2010, 06:45:44 PM »
sounds like the converter doesn't lock up (i think, not an expert on autos)


Or your trans is slipping!!

GOVT MULE

  • Guest
Re: TJ RPMs??????
« Reply #4 on: August 29, 2010, 07:57:15 PM »
My speedo is correct, I checked it with a GPS.

Yea, my concern/thoughts are that it may be a tranny issue. 

Anybody had any similar problems?

Offline sharpxmen

  • Chief Squirrel BlowerŪ
  • Member
  • *
  • Posts: 7093
Re: TJ RPMs??????
« Reply #5 on: August 29, 2010, 08:24:28 PM »

Or your trans is slipping!!

oh, and another one - does it shift thru all the gears?
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

RT

  • Guest
Re: TJ RPMs??????
« Reply #6 on: August 30, 2010, 10:27:45 AM »
oh, and another one - does it shift thru all the gears?

+1 sounds like you're getting stuck in 2nd

GOVT MULE

  • Guest
Re: TJ RPMs??????
« Reply #7 on: August 30, 2010, 12:56:24 PM »
oh, and another one - does it shift thru all the gears?

Yes, it shifts through all the gears, and will even downshift when I give it gas, or climb a hill on the highway, pass a car, etc...

runs good at idle, but on the road, it hovers near the redline, and thats keeping it below 55-60.

Offline sharpxmen

  • Chief Squirrel BlowerŪ
  • Member
  • *
  • Posts: 7093
Re: TJ RPMs??????
« Reply #8 on: August 30, 2010, 01:09:00 PM »
try to shift manually 1-2-D and see how the rpms drop (standing start in 1 and gain some speed, shift in 2 and gain some speed again and then shift in D - note the rpm drop between 2 and D and report back). Also, you might want to disconnect the kick-down cable for a test. That's as far as my knowledge goes with autos, there are a few guys here that are good with these and they might jump in with some suggestions. 
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline aw12345

  • Member
  • Posts: 3065
    • my jeep picture page
Re: TJ RPMs??????
« Reply #9 on: August 30, 2010, 02:44:58 PM »
Are you sure it has 3.73 gears?
2006 Jeep Wrangler TJ SE
2004 Jeep Wrangler TJ SE

Offline dwtaylorpdx

  • Member
  • Posts: 1038
Re: TJ RPMs??????
« Reply #10 on: August 31, 2010, 12:15:43 AM »
A auto does not have to slip very long to turn the fluid dark and give it a burnt smell.

Fluid should be clear pink and clean.     .... ??  8)

Dave

94 YJ - 2.5 Hesco Cam B&B Ported - AX5 Trans w/Centerforce Dual Friction Clutch - 4" Rough Country Lift W/Skyjacker Shocks - D44 Rear/ARB - D30/ARB - ARB Compressor - Warn M8000 in Custom Bumper - Reunell Rear Bumper - Metalcloak 6" Body Armor Kit - Tuffy Console - 265x85-16 Tires - 2M Radio

Offline aw12345

  • Member
  • Posts: 3065
    • my jeep picture page
Re: TJ RPMs??????
« Reply #11 on: August 31, 2010, 05:11:34 AM »
Well as far as the auto goes do a stall test is a good starting point as far as convertor function goes
2006 Jeep Wrangler TJ SE
2004 Jeep Wrangler TJ SE

GOVT MULE

  • Guest
Re: TJ RPMs??????
« Reply #12 on: September 01, 2010, 12:18:19 PM »
Thanks, Ill try this stuff and report back after the weekend!

RT

  • Guest
Re: TJ RPMs??????
« Reply #13 on: September 01, 2010, 09:11:04 PM »
you could just put bigger tires on it, then you'll go faster... :doggy: