First off I searched but I really couldn't find what I was looking for. If I missed anything please point me in the right direction.
I'm wanting to run the tranny cooler by itself and mounted in front of the radiator. I don't want to run an electric fan. My question is what size/brand should I get. What's the best one out there for the money? What would you all recommend to keep my tranny running cool.

cj7 with 258/Tf727/d300.

Thanks for the help

Ryan.

You'll want to run the largest cooler you can buy. The 727's tend to run hot. There are two types of coolers, the traditional finned type and the stacked plate. The stacked plate is suppose to be the best but did not work well for me. The is a high-end stacked plate that a lot people swear by, the name escapes me but do some more searching in the General section

I'd also recommend running the cooler separate with a dedicated fan to help cool the tranny.

Found it, search Google for Setrab cooler

That Setrab unit is badass! But a little spendy. Remember, you can OVERCOOL your tranny and cause damage as well. Put a temp guage on it, by all means. I had a simple HD cooler from B&M in my grill, with a little 10" fan on it, and tranny would sit and hold temp perfectly. With the guage on it, you can learn what causes temp jumps. It's kinda scary to watch, though!

Are there any other brand, and lets see costs as well, thanks. I need one to.

thanks for the infor , anyone else have any ideas on a tranny cooler?

dont run it too cool either. as was said before it can cause damage also, not as fast as heat but damage none the less. i would run it through the stock cooler in the radiator so when you run it when its cool out, it will warm up as the coolant does. just run a big cooler also with a dedicated fan and a temp gauge................. or go buy a manual tranny.:D

I run Setrab coolers for my PS and engine oil. There real cheap at my Pic and Pull. Volvo turbos is were I got mine for $7.00ea

i have a manual tranny in my jeep. iam converting it to an auto. i really just want to know what people are using that have an auto . how big is the cooler where did they get it. i jut want to know what cooler i should buy ive searched and theres alot of info on how to mount them and such but not alot on what brand , what size.

another vote for running it through the stock cooler on the radiator and the auxillary cooler. The fluid needs to heat up some before the tranny works right, and if your 727 is like the one on my scout you can tell when the tranny gets to hot by watching the engine temp and the hot atf spewing from all the seals:flipoff2:

would this cooler work? http://store.summitracing.com/partdetail.asp?part=FLX%2D4126&view=257#si

or

http://store.summitracing.com/partdetail.asp?part=BMM%2D70264

how hot does it get where you wheel/drive?
how high is your stall converter?
do you crawl or wheel at speed?
do you have a deep tranny pan?
is it finned for better cooling?

these all effect how hot the tranny might run. it should work, but if you crawl, run it with a good auxilary fan.:beer:

Originally posted by FULLSIZE
dont run it too cool either. as was said before it can cause damage also

I don't doubt your point, but the question I have is does any auto tranny run too cool? Reason I ask is that on my last stock vehicle, I added a cooler with fan and a thermo switch that kicks on at 195. The tranny wasn't supposed to run over 180 according to the manufacturer.

I was suprised that the fan would kick on for things like normal daily driving. :eek: :eek:

I'm just about the install a setrab in my TJ and I saw this post about "too cool" concerns. I'm in SoCal where out on the trails, the temps can really soar.

Originally posted by NoJoke


I don't doubt your point, but the question I have is does any auto tranny run too cool? Reason I ask is that on my last stock vehicle, I added a cooler with fan and a thermo switch that kicks on at 195. The tranny wasn't supposed to run over 180 according to the manufacturer.

I was suprised that the fan would kick on for things like normal daily driving. :eek: :eek:

I'm just about the install a setrab in my TJ and I saw this post about "too cool" concerns. I'm in SoCal where out on the trails, the temps can really soar.

It really depends on where your temp sensor is/was installed. At the pump output before the cooler your temps will be the highest, after the cooler the lowest. The pan will give you an idea of what is going on inside the tranny. I'd like to add another sensor after the cooler so I can see what is coming and going.

I would not worry too much about running it too cold out west. Primarily a concern for those with cold winters. I don't run mine through the rad and have not had a problem.

I've ran several jeeps with 727, 904 and 999 trannys. A stock cooler off a grand wagoneer will do you fine. Most yards will sell for $20 bucks, I have several if need one. I 'll send you one for $25 with shipping.

I run a big stacked plate cooler, about 8x12" or so. Junkyard find, I believe the factory app is a HD GMC truck. It goes through that first, then the radiator. My logic is that in hot weather, the big external cooler will knock the temp way back, and take most of the load off the engine cooling system. In cold weather, the fluid will be brought up near engine coolant temp before going back to the tranny. We see some heat here in the summer, more if I go south toward Las Cruces to run trails, hunt javelina etc. Winters at home often hit -20F, occasionally lower, so we get a little of everything. As for temp sending unit location, I like to know what's coming out of it (and the big remote PH8A filter has a fitting just for that purpose).

Detergents in ATF make it mildly hygroscopic, so unless the transmission temp gets over the boiling point of water fairly regularly they accumulate water (especially in humid environs). Whenever you have dissimilar metals in contact with a conductive fluid you have a battery, so water accumulation causes an electrochemical reaction that is much more destructive than plain old rust. This is the origin of the "too cool" concern.

thanks for the info . that was more on the lines that i was looking for..

I run an auxiliary cheap cooler rated as a 20 000lbs towing cooler for my tf727 in the rangie. It is mounted in front of the engine rad. No connection to the engine rad.

Gauge is just before the cooler. Stupid mistake was that i did not ground the sender first, so stayed below 50C all the time...

Now I see 80-95C after 20-30 km highway@100-110 kmh (70mph)
When wheeling it tends to stay cool.

Even in winter when we had -20C it stayed usable after a few miles of warmup. Shifting is delayed when cold, ut that suits since the engine wanst a few more revs when cold for decent power.

T

I run the big B&M cooler with fan and thermal switch. Its a little pricey but kicks ass at keeping it cool under load.

Ryan