Trans Cooler

[BTanzini]

Can anyone tell me what will happen if an auxillery trans cooler(heavy duty) with 3/8" openings cause any damage to the transmission when coupling up to the existing 1/2" lines from the transmission and existing cooler?
Thanks in advance.

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[Banshe]

Since the cooler has a smaller line, the transmission line pressure will continue to build until the case explodes like an erupting volcano! #ad
All other vehicles in the vicinity will be vaporized!!!

Naw, not really. #ad
I aint gotta clue what it'll do. Just readin the threads and gettin' board so thought I'd liven it up a little!!! #ad

 

[Dennis Garrett]

I'm thinking you should go same size or larger. I can't see anything but a restriction with the 3/8" cooler lines. It would be like a kink in your system.

 

[Josparkz]

My add on filter has a reduction in line size, and it has worked well for several years.

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"Roadrunner"-96 4X4 club cab-12v-auto-3. 54 gears-Amsoil bypass filter - all Amsoil fluids-trans filter-britebox-shelfit-DeeZee boards-Rhino liner-Rancho 5 speed shocks-Hellwig rear antisway & overload springs-Warn 12000 lb. winch-dual redtop optimas-combo gauge and trans. temp gauge in pillar mount-255/85R16 Kelly MSR tires-custom pinstriping- Walker muffler-Cummins mudflaps-Tuff Country control arms-2" coil spacers

 

[fortunate1]

I put a pretty large cooler (16-pass; 18"x12")under the left side of the club cab. I cut the return line after the elbow & rotated it 180 degrees so it pointed to the rear of the truck. After mounting the cooler (it's flat - parallel to the ground, so there is an effeciency loss; but it's got to be better than just the return line. ) I ran high-temp lines to each end of the cut return line, so now the ATF had to run through the cooler. Just used regular hose clamps and threaded together a 1/2" barbed adapter to a 3/8" barbed adapter for each end. Works great. No temp. guages but the outlet side feels a lot cooler than the inlet side that otherwise would be going back into the transmission if I had left things "stock". The flow rate and velocity of the ATF is not enough that the reduced diameter will cause problems. Also when changing the ATF, I'll disconnect the outlet hose and let the idling engine pump out most of the fluid into my drain pan. Then I can drop the transmission pan with very little mess!!

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95 2500 SLT, clubcab, 2wd, longbed, a/t, 3. 54, 142K miles, "all the usual refinements"

 

[Missouri Mule]

Banshe,
You had me going for second there! #ad
You should get bored more often. #ad


Bill I would think that a smaller opening you would get a little backed up going in but gush out on the return trip.
Really depends the fluid pressure going thru lines and capacity of new cooler. I think you will be OK.


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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000