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Tim240Z · 04-06-2005, 04:23 PM

I just got done shoehorning a 4L60E and L31 (5.7L Vortec) into my 71 C20.
The stock X-member works fine, but has to be moved rearward, but there are holes pre-drilled in the chassis by the factory that line up PERFECTLY. The only modification I did was to drill one new hole in the X-member to accomodate the 4L60s single stud mount, and I had to shorten the linkage a bit (the 4L must be about 1/4" wider at the shifter arm).

Tim

04-06-2005, 04:23 PM	#5
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	I just got done shoehorning a 4L60E and L31 (5.7L Vortec) into my 71 C20. The stock X-member works fine, but has to be moved rearward, but there are holes pre-drilled in the chassis by the factory that line up PERFECTLY. The only modification I did was to drill one new hole in the X-member to accomodate the 4L60s single stud mount, and I had to shorten the linkage a bit (the 4L must be about 1/4" wider at the shifter arm). Tim __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)