Join Date: Jun 2002
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Re: Convert from Turbo 350 to a 700R4 on 76 1/2 to
I am looking at doing a similar thing to my 72 Suburban. The first few years of the 700R4 were not very good. I don't know what the problem was but I was told to stay away from the 86 and older model years. 87 and after were better.
Another option to look at since you will be doing some trailering and wheeling is the 4L80E tranny. Yes, it does require some electronic wiring (not exactly sure what that all involves yet). The good thing about this tranny is it is essentially a Turbo 400 with an overdrive and some electronics. It is much more durable than a 700R4 and don't let the electronics scare you. I think it is pretty straight forward.
Advance Adapters has what you need for either swap. The good thing about the 700R4 is it has a 3.06:1 first gear compared to your 2.52:1 first gear (I think that is the correct ratio) plus the overdrive is 0.70:1 compared to the 4L80E which has a 0.75:1 overdrive. Not much difference really. Anyway, check out the links.
Good luck to you.