B'klyn9C1
08-28-2009, 01:47 PM
In the Sept. 2009 issue of Car Craft they published a guide to overdrive automatics. In the 700R4/4L60E section they say that a company called PATC (Performance Automotive and Transmission Center) has a new planetary gear set that gives the 700R4/4L60E the following gear ratios
1st - 2.84, 2nd - 1.55, 3rd - 1.00, 4th - 0.64
The information on the website is little different. It has the 2nd gear at 1.56 and the 4th gear OD at the stock .70. Boy that real tall .64 OD would have been real sweet in this day and age of high gas prices and compares favorably to the 200R4's .67 OD
Either way this does makes the 4L60E a true close ratio tranny without that nasty 1st to 2nd RPM drop that we experience.
Below is the link to the webpage and the information on the new gearset is towards the bottom:
http://www.transmissioncenter.net/competition.htm
I know that some of us have gone to the 4L80E for not only the increased HP/TQ capacity but also the the not as steep 2.48:1 first gear that allows a better ability to hook up off the line as compared to the 4L60E's 3.06 first gear.
Something to consider on the next tranny rebuild.
1st - 2.84, 2nd - 1.55, 3rd - 1.00, 4th - 0.64
The information on the website is little different. It has the 2nd gear at 1.56 and the 4th gear OD at the stock .70. Boy that real tall .64 OD would have been real sweet in this day and age of high gas prices and compares favorably to the 200R4's .67 OD
Either way this does makes the 4L60E a true close ratio tranny without that nasty 1st to 2nd RPM drop that we experience.
Below is the link to the webpage and the information on the new gearset is towards the bottom:
http://www.transmissioncenter.net/competition.htm
I know that some of us have gone to the 4L80E for not only the increased HP/TQ capacity but also the the not as steep 2.48:1 first gear that allows a better ability to hook up off the line as compared to the 4L60E's 3.06 first gear.
Something to consider on the next tranny rebuild.