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Old 02-19-2017, 07:15 PM
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01 Grand Cherokee Limited 4.7

I'm having issue with my 01 Grand Cherokee trans
I seem to have lost reverse. I'm currently searching for a
Used trans according to my build sheet I have a 545rfe can someone tell me if the 45 RF is the same transmission.
Is is the only difference just programming of the TCM on 01 and up Grand Cherokees.

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Old 02-20-2017, 07:23 AM
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Re: 01 Grand Cherokee Limited 4.7

Some info on the transmissions..........

The 45RFE, 545RFE, and 65RFE automatic transmission for Jeeps and Rams
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Old 02-20-2017, 07:48 AM
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Re: 01 Grand Cherokee Limited 4.7

Welcome to the garage. I would first check if the rigging of the shift lever is correct. Just remove the shift cable from the transmission and check with the shift lever in P, if it lines up with the transmission shift lever in P (rearmost position on trans lever).
How is the transmission fluid looking? No burnt smell or black fluid?
Eventhough this transmission is electronically controlled, reverse is completely mechanically. The shift lever just moves a mechanical valve inside the valve body. Two clutches are pressurized to engage reverse, The Lo/reverse clutch, which is also used for 1st gear, and the reverse clutch.
If you would have to change the transmission, there is indeed no difference in between the 45 or 5-45 RFE transmissions. The only difference is the programming of the TCM.
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Old 02-21-2017, 05:19 PM
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I checked out on the linkage everything seems to be in place .The fluid looks good not dark or burnt
Jeep still has no reverse or very slight.
So I'm looking for a salvage transmission what year or years Grand Cherokee does the replacement trans need to be from .I'm a little confused as my build sheets reads 545rfe on a 2001 Grand Cherokee all thetransmissions that I have seen are 45rfe just to be sure the only difference between a 45rfe and 545rfe is the programming in the ECM . ?
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