Will another auxiliary cooler increase line pressure and slow the ATF flow?

[FTG-05]

Everything I've read over on the various diesel boards says the 6.0 cooler is the shiznit. No dog in the fight since I run a manny tranny!

 

[terryknight]

when you install your new cooler upgrade to the larger super duty lines

 

[BWSwede]

The installation is done but I didn't install the larger lines. Do you know if they are a direct replacement for the stock lines found in my OBS truck? In other words, they are the right length, have all the right bends, and the same end fittings?

Thanks,
Blane

 

[terryknight]

part numbers. hope the pic come through

Line F81Z-7A031CE

Line F81Z-7A030CA

By Pass Tube 2C3Z-7H322-BA

Need the bypass tube.

 

[the old grind]

Have to understand that the cooler circuit is tied to the converter circuit (see orange line) and runs at lower pressure (usually ~30psi) than the pump's max to the valve body & clutches. Can't be compared to engine oil pump/filter config. Heat comes from TC slippage, and the rpm of the least of that will likely be above 2k. It's not tied to stall speed as we might assume.

Glad you got the bigger 6.0 cooler, likely never too much for any towing. It should help a bunch, but IMO a bit more rpm and thus less slip would help too, if only to shorten your time on the hill. Bypass (blue line meets green returning to pan) could (should) be thermostatically controlled (computer) to allow warmup when cold. If there's a valve there wired to the computer it could stick and bypass cooler without computer sensing mechanical hangup when 'feedback' reads 'circuit is ok'. Fluid will more likely coke in lines vs cooler, so I'd look to the HD lines. Should bolt up if similar trans in other models.

I'd avoid manual lockup & leave it to the computer. Lots of good advice here. You guys rock!

 

[schmism]

When you say lock up the TC are you suggesting installing one of those high performance devices that can control the computer? Or are you suggesting that the TC will lock up naturally in 2nd or 3rd depending on the speed I can achieve coming up the hill in 4 low?

Some noted that the truck will not lock up the TC in first gear. Thats not an uncommon control strategy for an auto trans.

2 ways to get the truck to lock the TC. Generally if you have an OD switch, commanding the OD off will often lock up the TC. Additionally a tow/haul mode is likely to do it also. So the idea is, pick 2nd or 3rd on the shift lever, then choose OD off (or tow/haul) and this should force the trans into the chosen gear with the TC locked up.

NOTE, on my 2001 E350 the gear selection for 2nd forces the trans to 2nd. So from a standing start if you shift P -> 2 the truck starts off in 2nd gear.

 

[the old grind]

An interesting parallel: In pre-computer days my '81 Escort seemed to lock up as a 1-2 shift and remain there thru' the other gears. At the time, GM's THM 350-C would only lock up in the highest gear. (completely different case, valve body(s), etc than THM-350) Different shift strategies between brands back then. A computer could lock a TC at will, but require road speed input not to do so when stopped.

An occasional problem with '80s GM FWD compacts (Cavalier, Grand-Am, etc) as they aged was stalling when coming to a stop when the TC wouldn't unlock. Simple fix was to unplug the TC switch externally. No lockup, no stall, and lead-footed student drivers wouldn't notice reduced gas mileage. (getting them to class is part of getting them out of the house )

Not every one realizes that automatic transmissions were the first 'computers' in cars, and came along before WWII. Shift selectors traditionally limited the highest gear the trans would shift to. Computer, you say? Yes, but hydraulic vs electronic. Governor provided road speed input, 'detent' linked to throttle was T-position input, and vacuum modulator was load input (more load = less vacuum). Valve body was the CPU that refined shift points accordingly.

Modern transmissions (their computers) read road speed digitally, get 'load' info from MAP sensor, and T-position by that little goodie that can act up independently of a computer monitoring its circuit loop. Biggest diff in modern stuff is servos hung on valve bodies vs them doing their own work stand-alone. Some early 'tow-haul' controls just raised shift points to account for slippage at lower rpm under load and reduce TC-generated heat. If the rest of this post doesn't mean much to the OP or others, I'll stick to wanting him to get the revs up & let the computer do the locking ...

 

[BWSwede]

Wow. You guys are putting up a lot of great information.

The larger lines make sense but I am going to see if the lines and larger cooler I have now will do the trick before I do any more upgrades. I take it since the hard lines connected at the transmission change to hose before they get to the radiator that all the hoses to the radiator and the barbs on the radiator need to be changed to 1/2" diameter as well.

I am pretty sure the bypass is working as it should. When my cooler was plugged my tranny heated up. After I flushed the cooler numerous times the tranny ran much cooler (under a light load) which tells me the bypass was not being used.

I do have an OD switch. I didn't know that activating it would lock the TC. What are the manufacturer's thoughts about doing this. Simply to lock the TC? If this works on my truck it should would be great to be able to lock the TC in second gear. It is odd to me that I have not heard of this before. Is it some undocumented feature found on the E4od's?

Thanks again for all the input guys. Like I said before, this is really great information to have.

Blane

 

[terryknight]

the E4OD will only lock the TC in 3rd and OD. you can add a TC lock up switch or get a chip with trans tuning on it.

 

[the old grind]

'OD' should be another shift mode and power path thru' the gear-sets vs just lock-up, which can be available in any shift range. Anyone may be able to see lock-up by twitching the throttle slightly in a certain gear. If tach jumps a bit & out of proportion with speedo, your not locked. If they're obviously in synch, you are. (Yeah, I know you were thanking the group as we simul-posted. Great bunch, huh?)