Rrusse11 wrote: So googling around, it looks like two options; the Aisin AX15 or the NVG3550.
Gear Ratios 545RFE automatic: 1st 3.00:1; 2nd 1.67:1; 2nd Prime 1.50:1; 3rd 1.00:1;4th 0.75:1; 5th 0.67:1; 3.00:1 Reverse
AX15: Gears: 3.83, 2.33, 1.44, 1.00, 0.79 (First through Fifth); 4.22:1 Reverse
NVG3550: Gears: 4.01, 2.33, 1.39, 1.00, 0.78 (First through Fifth); 3.57:1 Reverse
The 545RFE does have a taller Overdrive, more suitable for it's "crossover" capability on the highway. The two manuals are geared lower, and more suited for offroading.
The swap has certainly been done, but the articles I found were for gassers.
Here's a thread on the 6spd ratios, not sure if it's for the CRD Euro 6spd. viewtopic.php?f=3&t=10759
Changing the diff and using one of the above 5 spds may give better final drives for the CRD.
You would need a 3.15:1 axle ratio to get either of those manuals back to where the 545 was on the freeway. I lost interest in a manual when I realized all of cheap options had crappy gear ratios. The jeep already turns fairly high rpm’s stock on the freeway. I’m not willing to give up any more.
_________________ 2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs
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