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Old 02-27-2017, 04:19 PM
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6.1L Transmission

Why does the 6.1L use the same transmission as the 3.7L? I would have guessed it would be the same as the 5.7L.

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Old 02-27-2017, 08:06 PM
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Re: 6.1L Transmission

IMO, because Chrysler is stupid. The NAG1, IMO, is far superior to the 545RFE. I have the NAG1 in my Hemi LX and it is a true autostick transmission with better (closer) ratios (except in first gear) than the 545RFE in my Jeep. I will say that the 545RFE, aside from the crappy ratios and the "takes forever" 4th or 5th to 2nd forced (WOT) downshift, can be made to be "tolerable" with a few simple, inexpensive modifications. What I did to mine is a Transgo Shift Kit, a Sonnax Line Pressure Booster and, with the Advanced Transmission Tuning Application (ATT) on the Superchips Tuner, set up my own custom up/down shift schedules and torque management settings. I think, without a performance rebuild, it is now about as good as it can get.
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Old 03-01-2017, 03:43 AM
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Re: 6.1L Transmission

Agree with the above. NAG1 is far better! If you stick an SRT lump in a 5.7 without changing the box to a NAG1, it will cr@p itself. You can also buy flappy paddle kits for the NAG1. Apparently the 545RFE is better for towing but looking at some of the things being towed on the SRT forum, I wouldn't say the other is bad. If mine ever gets back from the body shop, the engine & tranny change is definitely on my to do list
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Old 03-23-2017, 09:40 AM
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Quote:
Originally Posted by DLStryker View Post
Why does the 6.1L use the same transmission as the 3.7L? I would have guessed it would be the same as the 5.7L.

Because the nag1 is far more power efficient. Its just better at power delivery and its lighter overall. Hence why the 545 is better at towing, its more heavy duty for that application because of its 2nd and 3rd gear primes
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