I am looking for comparison information from other KJ owners with the 45RFE transmission. I am trying to find out what is the normal converter lock up speed in 4th gear cruise. Mine only seems to lock up in 4th when I hit about 60 MPH. I have had the custom tire size set in the PCM/TCM (whichever they set it in). I suspect that I should be getting TC lock in 4th earlier than 60 mph. If I lock out overdrive I get it almost immediately after shifting into third. If I then click the OD button again, It shifts to 4th locks the TC and then immediately unlocks the TC. What is your experience?

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

How heavy are you on the gas? From what Ive read, easy on the gas should be around 40-50mph with the 45rfe. Let others with the 45rfe post before you take my word.

If Im heavy on the gas with my 42rle it will stay unlocked till I let up on the gas.

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster

This is really light on the gas. Even steady cruise won't lock until I hit 60.

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

My 45RFE won't lock until 40mph in 4th gear(OD).

I'd say around 40 / 45 MPH as well...

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks

Is it a very noticeable lock up, similar to a gear change?

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

If mine is not locking in OD until 60, but is locking in 3rd just after the shift, what could be causing this?

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

My OD has always locked in at 63-64 mph. For best highway mileage i usually get up to 65mph then settle back down to 60-62. I dont think it unlocks till around 55 or so.

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Pre-Lowered 02 Liberty
2.5" Rustys Coil w/ Ranchos in the rear.
ARB, OME927's, 1/4 strut plate and Als Gen 4.5 Uppers in the front.
Flowmaster Super 40 Series (GONE, SO QUIET!)
245/75/16 Kumho KL-78 w/ Spidertraxxxxx
Ripped out the plastic inner wheel liners
Herculined ALLLL over.....

Thanks for the response. That seems to be what mine is doing. I would like to get a more solid OD converter lock at around 40-45 MPH for round town driving. I think it would really improve mileage.

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

Talk to Wayne at APS Precision. He can get you an upgraded torque converter and a reprogramming kit that will make you very happy with the 45RFE.

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June 2001 Liberty Limited 4X4
Frankenlift II Premium, Al's Upper Arms, 245/75R16 C Silent Armors on Moabs, RL Skink Super Sliders, Rear DTT, Riddler Diff Cover, Fastman Throttle Body, Profinish-Proglass Hood, Borla Dual Outlet Exhaust, TransGo Reprogramming Kit, APS Stall Converter, 4.10 Gears, B&G Chrysler PCM, Lots of Line-X, etc...

TCC lockup at about 60 - 61 MPH is normal for the 45RFE. This is of course, under light throttle. The 42RLE (and most other autos) tend to lock up around 40 MPH.

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'05 Liberty Renegade, 6-speed
'99 TJ Sport

Thanks for all of the help. Glad to hear that it is normal. I really didn't want to pay the stealership another $100 to check it out.

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'03 Sport
Grand Cherokee TCM, Skids, Superwinch EPi 9.0 in cradle mount with 125' 5/16 Viking Trail Line, Mopar Rock Rails, Trac-Loc Diff, Frankenlift in front and Skyjacker/JBA springs out back, Monroe Reflex Shocks in rear, JBA Gen 4.5 Upper Control Arms, Moog LBJ's, 245/75/16 Goodyear Wrangler Duratracs.

That's what we're here for!

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Pre-Lowered 02 Liberty
2.5" Rustys Coil w/ Ranchos in the rear.
ARB, OME927's, 1/4 strut plate and Als Gen 4.5 Uppers in the front.
Flowmaster Super 40 Series (GONE, SO QUIET!)
245/75/16 Kumho KL-78 w/ Spidertraxxxxx
Ripped out the plastic inner wheel liners
Herculined ALLLL over.....