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Old 11-30-2010, 08:29 AM
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Cooling a 700R4..

I have a S10 w/a V8 swap & a 700R4. the radiator i'm using is one out of a Corvette, it has the cooling ports. Will that be enough to keep the tranny cool? Or will I need an axillary cooler as well?

I will not be towing at all, but I do drive this to shows 350 miles + in summer months.

Thanks.

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Old 11-30-2010, 09:51 AM
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An external auxiliary Cooler is always a +. If you're running a Converter with higher than stock stall rating a external is always needed.
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Old 11-30-2010, 10:09 AM
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It's a 2200 stall..

I'm worried because the Corvette radiator I hear needs good air flow thru it & if I put the tranny cooler I have may slow the flow down??
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Old 11-30-2010, 10:29 AM
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I always run a extra cooler ... ALWAYS .

I mount mine away from the exhaust but on the frame rail. I would imagine your chassis is fairly tight ( but with more room than my 32's ) ... but I also add a extra transmission filter. The extra capacity of the cooler and the extra filter ALWAYS helps. I mount my cooler and filter before the fluid enters the radiator.

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Old 11-30-2010, 01:54 PM
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Here's my rule of thumb (for most vehicles). In light duty applications (like a 4cyl s10 that doesn't do much but commute) I route the fluid from the tranny to an external cooler, then through the radiator and back to the tranny. In most anything else, I run from the trans to the radiator, then an external cooler, and back to the tranny.

The only time I bypass the radiator and use just an external cooler is in situations where the radiator's internal cooler is a known problem area like dodge pickups or if I have replaced the radiator with a cheapy aftermarket unit. The problem with using JUST an external cooler is that its hard to get it right. You either cool it too much and it can't evaporate impurities and reach proper designed operating temps, or its too small and it can let temps spike.

The circuit in the radiator is insufficient (to put it nicely) but it does have one advantage; its a fluid-water heat exchanger. Provided that the coolant temp stays constant, its a great buffer against wild changes in temp.

SO... my reasoning is this: with the first scenario (cooler-radiator-trans) the cooler acts as additional heat removal capacity, but retains the warm-up properties of the hot coolant. with the second scenario (radiator-cooler-trans) it not only adds cooling capacity, but makes temps much more stable.

If you bypass the radiator completely, its much like taking the thermostat out of the engine - the wide array of operating possibilities are purely at the whim of the environment. Shorter trips in winter and it might not get warm enough. Towing a trailer in Arizona in the summer and it might spike too high.

Its not like running a transmission cold is a terrible thing, its just very similar to engine oil temperatures. Engines are designed to sustain a certain pressure and film tension at operating temperature and transmissions are no different. If you constantly run it with thick, cold fluid, it will be operating at pressures and viscosities that were not part of the original design.
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Old 11-30-2010, 02:11 PM
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Quote:
Originally Posted by curtis73
I route the fluid from the tranny to an external cooler, then through the radiator and back to the tranny. In most anything else, I run from the trans to the radiator, then an external cooler, and back to the tranny.

That's how I did it w/the TH350, My only concern is will the tranny cooler block or slow down the flow going to the radiator.

I just keep hearing on other forums that the Corvette radiator doesn't keep a mild V8 cool..I don't see it wouldn't. I mean it cools the Corvette's V8 w/ac.

Thoughts?
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Old 12-01-2010, 07:01 AM
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I'm a vette owner and can shed some light on cooling. The early 70s big blocks engines where the ones with cooling troubles. Its the design of the front end of the car not the radiator. These cars are what we call bottom feeders. No real grill in the front to let air in so all the air comes in from under the car and up to the radiator. The fan shroud has to be sealed 100% to the radiator for correct air flow. GM finally made design changes is the 80 thru 82 models, adding a better scoop under the front bumper. You did'nt mension what year corvette the rad is from but I havent heard of any cooling issues in cars from 85 to present. Hope this helps.
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