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Tech & Fab
4l60E to Ford NP205
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<blockquote data-quote="RustyC" data-source="post: 618551" data-attributes="member: 1997"><p>Looking at the mating a 1996 up 4L60E with the 6 bolt rear case and factory 6 bolt t-case adapter to a Ford NP205. </p><p>I am currently running a TH350 to Ford NP205 behind an 5.3 LS and looking for lower gearing. I do not want to go lower axles gear because I'm running flipped 9"s / 5.13 in a rear engine setup.</p><p>I did have a 4.3/th350/dana 300 in the same rig and it felt plenty low enough, then swapped in the 205 ,now a 5.3 LS and still want a little lower gear. </p><p>Pinions are small as is. </p><p>My thoughts are using the 27 spline female to 31spline spud shaft from my current setup with the factory 4l60e six bolt adapter and my 205 with clocking ring. Has anyone done this combo???</p><p>My 205 has a speed sensor on it now so I'm good there. I have also read of a 32 spline 4L60E output shaft used in a ZR2 but have not confirmed this.</p><p></p><p>TH350 + Dana 300 + 5.13 = 33.74 ratio in first gear. Plenty low enough. </p><p>TH350 + NP 205 + 5.13 = 25.34 ratio in first gear. Not low enough. </p><p>4L60E + NP 205 + 5.13 = 30.77 ratio in first gear. May be just right. </p><p></p><p>The other option is an Atlas T-case but honestly I like the old 205 and a transmission swap would cost less.</p><p></p><p>Using a Winters shifter now with a TH350 rockcrawler gate. Will my same shifter work with a 4L60E using new hardware at the trans and new 4 speed gate?</p></blockquote><p></p>
[QUOTE="RustyC, post: 618551, member: 1997"] Looking at the mating a 1996 up 4L60E with the 6 bolt rear case and factory 6 bolt t-case adapter to a Ford NP205. I am currently running a TH350 to Ford NP205 behind an 5.3 LS and looking for lower gearing. I do not want to go lower axles gear because I'm running flipped 9"s / 5.13 in a rear engine setup. I did have a 4.3/th350/dana 300 in the same rig and it felt plenty low enough, then swapped in the 205 ,now a 5.3 LS and still want a little lower gear. Pinions are small as is. My thoughts are using the 27 spline female to 31spline spud shaft from my current setup with the factory 4l60e six bolt adapter and my 205 with clocking ring. Has anyone done this combo??? My 205 has a speed sensor on it now so I'm good there. I have also read of a 32 spline 4L60E output shaft used in a ZR2 but have not confirmed this. TH350 + Dana 300 + 5.13 = 33.74 ratio in first gear. Plenty low enough. TH350 + NP 205 + 5.13 = 25.34 ratio in first gear. Not low enough. 4L60E + NP 205 + 5.13 = 30.77 ratio in first gear. May be just right. The other option is an Atlas T-case but honestly I like the old 205 and a transmission swap would cost less. Using a Winters shifter now with a TH350 rockcrawler gate. Will my same shifter work with a 4L60E using new hardware at the trans and new 4 speed gate? [/QUOTE]
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