Slowly fill it and check it.

mike orlando said:

Slowly fill it and check it.

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This ^, and go get yourself a manual.

same way you check any fluid levels, fill a little, check if needed fill more. or google your question.

What these gents have said, and +1 on the manual- you know the golden rule of DSMery is to have the factory manual!

Why would transmission fluid leak if you were changing your radiator?

95AWD6Bolt said:

Why would transmission fluid leak if you were changing your radiator?

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auto transmissions go to radiators

What he said. Trans cooler lines run through the rad. Us automatic guys get the fun of those extra hoses and million clamps.

When I got mine I guess it was all separated already cause mine is just the radiator. I always thought that is how it was for a while. But finally figured it out about a year ago.

You may want to modify the tranny lines to bypass the radiator, it does more harm then good if you run your car hard. (It's there to warm the fluid on cold mornings)

Also, you should be using Chrysler compatible ATF fluid, Redline C+ ATF is highly recommended.

ZombieSix said:

auto transmissions go to radiators

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Ahh, ok. I didnt know that. Thanks!

I bought valvoline +4 ATF for it. Is it ok that it's for Chrysler engines. Mines a 420a. I figured it would be but just wanted to double check.

WillRaceForBeer said:

You may want to modify the tranny lines to bypass the radiator, it does more harm then good if you run your car hard. (It's there to warm the fluid on cold mornings)

Also, you should be using Chrysler compatible ATF fluid, Redline C+ ATF is highly recommended.

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The cooler certainly DOES NOT do more harm than good. You are definitely going to have cooler temp's even with the oil/water cooler versus no cooler at all. With no cooler at all the transmission would literally last months versus years.

bryanwheat said:

The cooler certainly DOES NOT do more harm than good. You are definitely going to have cooler temp's even with the oil/water cooler versus no cooler at all. With no cooler at all the transmission would literally last months versus years.

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+1. Don't bypass it. It's called a "tranmission oil cooler" for a reason. It help keep the fluid cooler, as heat is the #1 enemy of auto transmissions.

I would personally use a manual.

So you guys are saying the 420a DSMs do not have an air to oil cooler? I may have mistakenly thought that the 420a ALSO has an air to oil cooler (My GSX had both a air to water and air to oil).

If that is the case, get a air to oil cooler... Running the AT at the same temp as the coolant is a bit on the warm side for the tranny fluid, and as soon as you push it you'll creep in to danger zone quickly.