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-   -   5-45RFE Gear Numbering (http://www.ramforumz.com/showthread.php?t=72074)

Gene K 01-21-2011 02:30 PM

5-45RFE Gear Numbering
 
Why does Chrysler call it a 5-Speed Automatic yet number the gears:
3.00 - 1
1.67 - 2
1.50 - 3
1.00 - 4
0.75 - 5
0.67 - D (6?)

I know you only usually only go through 5-gears when accelerating but calling it a 5-Speed and numbering it differently on the readout is confusing.

PS Does anyone else have to exceed 55 mph to get the truck to upshift into high (0.67)? It will hold it once I slow back down to 55 mph but it wont upshift until roughly a registered 57 mph (4.7L 3.55 265/70R17).

chithead 01-21-2011 02:34 PM

If you notice, the ratio of 2 and 3 are really close to each other. I believe gear number 3 is actually the passing gear, and is only used when downshifting to pass, and then it is also used as gear number 3 in tow/haul mode, which locks out gear number 6.

Gene K 01-21-2011 02:44 PM

Quote:

Originally Posted by chithead (Post 419385)
If you notice, the ratio of 2 and 3 are really close to each other. I believe gear number 3 is actually the passing gear, and is only used when downshifting to pass, and then it is also used as gear number 3 in tow/haul mode, which locks out gear number 6.

i know they are close. Its just weird that they numbered them 2 and 3 when in "manumatic" mode instead of 2 and 2P (Prime). I had to figure out on my own which gears are which since Chryslers Tech Documents and the Readout dont match.

RamTech 01-21-2011 02:51 PM

Chrysler does indeed call the additional second gear the 2 prime. What you have posted didn't come from a Chrysler service manual. The following article is copied straight from Chrysler. http://www.ramforumz.com/showthread.php?t=55657

chithead 01-21-2011 02:53 PM

Yup, it's awkward for sure.

Gene K 01-21-2011 03:14 PM

Quote:

Originally Posted by RamTech (Post 419401)
Chrysler does indeed call the additional second gear the 2 prime. What you have posted didn't come from a Chrysler service manual. The following article is copied straight from Chrysler. http://www.ramforumz.com/showthread.php?t=55657

Thats my point. Chryslers Tech Documents call them one thing and the gear position indicator on the dash calls it something else. What I posted is what the Gear Indicator reads in each gear.

3.00 - 1
1.67 - 2
1.50 - 3
1.00 - 4
0.75 - 5
0.67 - No indication (Other than the 150 rpm drop at 60 mph when you bump it out of "5" into normal Drive)

RamTech 01-21-2011 05:35 PM

When your indicator is showing 5, you're in the 0.67 overdrive ratio. Both the second gear ratios are not use in the upshift pattern. The 2 prime is only used at speed when kicking down from the direct drive ratio. Your upshift pattern is 3.00>1.67>1.00>0.75>0.67. When downshifting the trans goes from 1.00 to 1.50.

DBryant 01-21-2011 08:07 PM

I think that last gear shift you are referring to is actually the torque converter locking up, not an actual 6th gear.


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