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Old 05-31-2010, 08:51 PM
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700r4 and 10 bolt rearend question

I have a very mild 305 in an 86 C-10 with a 700r4 and a 10 bolt rearend.Was thinking of or was wanting to put a shift kit in but guys keep telling me not to deal with it in 700r. Was also looking to put in new gears to replace the 3:08's but not real sure what size. My tires are 255/50/17. What to do with 700r and what size gears.

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Old 06-02-2010, 01:33 AM
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IMO the 700R4 is a great street and street/strip trans. A shift kit will improve the shifts and allow you to shift into any gear at any speed, if you so desire. Do you need a shift kit? It might be a matter of, do you want a shift kit. That's what I tell my wife when she asks, do you need that? It's not a matter of needing it, it's a matter of wanting it. Shift kits are easy to install if you have ever worked on a automatic trans before. If not, might want to get some knowledgeable help.

In stock form, and in good condition it will handle a 305 easily, as you already know. Keep the operating temp in control and have the TV cable installed and adjusted correctly.

With 17" wheels you could go to a lower rear ratio and gain a lot of low end snap and still be able to cruise on the highway at a very low RPM for economy. I'd first determine at what RPM I wanted it to run on the road, at your usual cruise speed, taking into account the engine's ability to run there, in OD with the TCC locked up, without lugging. Then play with the online calculators to see what gear would be optimum.
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