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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-23-2008, 02:06 PM   #11
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I believe it'* 1/8-NPT (1/8-27 national pipe thread) but I could be mistaken. I don't remember if it'* a taper, but the sender from Cyberdyne was a perfect thread match.

Edit, cyberdyne lists it as 1/8 NPT. That'* correct.

One of the other reasons I prefer cyberdyne is their option for high-low memory recall, and user-adjustable warning points.

Part # A221E061Y-Black Bezel w/memory
RED Transmission Temperature
Requires 2 1/16” hole for mounting with back clamp provided. Range is 70-260F. Features ‘Hi” and “Lo” scrolling warning and user adjustable “flashing” warning. Available with high and low memory recall feature. Requires Cyberdyne temperature sender shipped with gauge. Order from part number list below.

Click the image to open in full size.

$59.99 with memory and the sender at Jeg'*.
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Old 03-23-2008, 04:45 PM   #12
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I've been towing travel trailers for a number of years now and have learned some lessons the hard way....
Keep in mind that if all you have is the stock transmission cooler, (note the transmission coolant lines going into and out of your radiator), then your trans will never run cooler than your engine and will often run quite a bit hotter when going up long, steep grades or towing. Transmissions in the other GM cars, vans and trucks that I've had, can run safely up to 240 degrees, however I've been told by transmission experts that you should never run transmissions over 250 degrees. I had a trans temp gauge on my 92 Chevy van (after blowing up two trannies towing a trailer with it). I discovered that if you can manually lock your TCC (which was easy on the OBD I GMs) your transmission temperature would drop quickly back down to engine temperature. The excess heat in your trans is generated mostly by friction in the torque convertor as the engine side and the trans side spin at different speeds when not locked up by the TCC. You want this "slip" most of the time, it gives you power multiplication, like slipping your manual clutch. But it makes heat too, just like slipping a clutch. Another source of heat is when the trannie shifts back and forth between gears a lot--happens on long hills as gears are constantly releasing and engaging, which makes for slip and thus heat. So if you're climbing a steep hill you're probably better off keeping the trans in the lowest gear it wants to go into (i.e., it keeps shifting into 3rd in order to make it up the hill) instead of letting it shift back and forth.
Anyway, bottom line(*) 1) Your stock trans and cooler are designed to run cool enough if in good working condition, even on hot days and up long grades (unless you're towing). If they don't, which you won't know without a trans temp gauge, then you might have internal problems that should be corrected. 2) Knowing your trans temp is only half the battle. You also need to be able to keep it down if it'* too high. Aftermarket trans coolers, installed (in MY opinion) on the return line from the stock cooler or, if big enough, instead of the stock cooler are one answer. If that doesn't work, or at least not well enough, can you put in a switch to manually lock up the TCC? 3) Not only that, but is your cooling system in good working order? As noted before, your trans is tied into your engine cooling system. 4) Is your engine running right? An engine that is running poorly will generate more heat than a well-running engine.
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Old 03-23-2008, 05:07 PM   #13
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Lets hit up several things here...

First, anything near or over 200F is not helping the trans, It'll actually over time help it fail quicker...

The 94- 97 Bonneville 4T60-E PCM does monitor Transmission temps... 260F would send the trans into limp home mode... You will be reduced in every manner as the PCM tries to save the trans from cooking its self into impending BBQ Doom...

Second... Depending on where you are these 4T60-E transmissions can easily spike to 230F on a warm day, keep in mind thats not far from 260F

Third, On the 1995 SE there is a single cooler internal to the radiator on the passenger side... This is a very small cooler, even with a 180F T-Stat the Trans can still get very hot.. The radiator used on the 1995 SE Bonneville is very very light duty.. Just imagine its 85F outside, the engine is at 200F... Then the Coolant gets somewhat cooled only to hit the hot trans cooler and then return to the engine, and people wonder why they heat up soo easy in traffic.. Also remember the hotter the engine gets, the hotter the trans is going to get as the ability of the trans cooler goes out the window by the time you hit the fan turn on temps..

After seeing and taking these transmissions apart, you don't want these units to get too hot... There are a lot of seals and O-Rings that can and will fail... at the same time you can cook the fluid and kill off the Clutch Packs.. Also if you were to start with fresh fluid at the beginning of the warm season and its brownish at the end of the season, this would tell me that the trans has been overheated a few times possibly more....

I'd say an Ideal range for the 60-E would be 150-170F...

Due to the Climate I am in I run an RV Trans cooler, and the internal cooler is bypassed.. Mine is a Hayden and is not thermostatically controlled... I need what cooling ability I can get for both my driving style and the sometimes hot Florida Temps.. The reason I installed a cooler is I found out how easy it was to get the trans to 230F... And I wasn't even hot rodding the car... I was just running through town taking care of bills shopping and such... I didn't like seeing 230F on the Scantool.. And the fluid was already Brownish again...

If you were to install a cooler, you can run in tandem with the internal cooler, this also will help keep the Trans temps down..

Also, 190F in your area and climate is quite warm... I'd hate to see what it would do here in Florida in the middle of July

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