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Sonnax Electric Line Booster for 545RFE Transmissions
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=98&t=48850		 Page 1 of 1
Author:  Randy B [ Thu Dec 31, 2009 11:09 am ]
Post subject:  Sonnax Electric Line Booster for 545RFE Transmissions
Purchased this from PATC and installed it yesterday. About a ten minute install. Shifts are more firmer and have not had any shutter yet, Cost is about $50.00. Will give more feedback on this in several days.

This family of transmissions uses a full range line pressure sensor mounted on the
outside of the transmission for "closed loop" line pressure control. Due to this
system, traditional methods of raising line pressure by changing the PR spring or
valves have no effect. The Sonnax Line Pressure Booster alters the pressure signal
sent to the computer causing the computer to raise line pressure. Part number
44957-LB1 (68RFE) has 10-15 psi increase, and 44957-LB2 (45/545RFE) has 15-30 psi
increase. Higher line pressure increases clutch holding power and torque
capacity but with these transmissions, the increase has a limited effect on shift
feel. Changes in shift feel will be noticed mostly under aggressive driving or
loaded conditions. This part is ideal for heavy duty and modified vehicles and
even stock transmissions when a little extra pressure is desired. No other
modifications are required. The Line Pressure Booster installs between the
pressure sensor and vehicle harness using OEM style sealed connector
Author:  Sidewinder [ Fri Jan 15, 2010 2:32 am ]
Post subject:  Re: Sonnax Electric Line Booster for 545RFE Transmissions
Any update on how this is working. I would think that a little extra line pressure would be nice for those with a tune or those who tow.
Author:  salden77 [ Mon Jul 19, 2010 8:43 pm ]
Post subject:  Re: Sonnax Electric Line Booster for 545RFE Transmissions
same here update please
Author:  gmctd [ Thu Jan 13, 2011 1:42 am ]
Post subject:  Re: Sonnax Electric Line Booster for 545RFE Transmissions
It's a low ohmic-value half-watt resistor anyone can buy at Radio Shack for the princely sum of $0.015 (that's right, folks, read it and weep: fifteen cents!) - prollem being, at mild accel event the trans bangs into gear, whereupon TCM will "learn" and eventually reduce pressure - works fine under load or high rate of accel, but again, TCM will "learn" and alter the pressure - more evident with the low-stall oem-stock Hemi T\C or Suncoast T\C - resistor is prolly not worth the trouble - mo' bettah to get a manly-man's T\C and a TCM tune
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