My 700 r4 has electronic speedo drive, and I want to switch to gear driven speedo. Is this a straight unbolt/bolt on conversion, or is there more to it than that?
All you have to do is switch tailhousing. I just ran into this yesterday on my 66 Caprice. I used a tailhousing from a mid 80s 2wd Suburban. Watch out when getting a tailhousing, different applications used a different tranny mount pad location. Bad news if the tranny crossmember's already welded in.
You might also have to change the drive gear. Some of them had a tooth ring instead of the spiral cut gear.
All you ever wanted to know about the 700R4 and some others http://www.geocities.com/crosley_az/4l80e.htm
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