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Old 11-14-2009, 11:31 AM
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Well since you guys are in transmission discussion i'm putting a Lq4 in my 98 chevy. It has a 4l60e. I need to be able to tow 5000lbs long distances without problem. Hence the 6.0L. But i was told I should swap to the 4L80e. What would you guys recommend for the truck so I can tow and still get good fuel economy. 4L60E with a controller, 4L80E, or 200R4? or one of the other L70e, 60e etc.

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Old 11-14-2009, 12:03 PM
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Quote:
Originally Posted by pavetim
Well since you guys are in transmission discussion i'm putting a Lq4 in my 98 chevy. It has a 4l60e. I need to be able to tow 5000lbs long distances without problem. Hence the 6.0L. But i was told I should swap to the 4L80e. What would you guys recommend for the truck so I can tow and still get good fuel economy. 4L60E with a controller, 4L80E, or 200R4? or one of the other L70e, 60e etc.

Buy a diesel powered truck is my recommendation
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Old 11-16-2009, 07:07 AM
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4L80E is the only way to go. You can build a 4L60E to do it, but you'll spend as much as a 4L80E.

But 6.0L and MPG can't really be put in the same sentence. Diesel will pretty easily double your towing mileage.
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Old 11-17-2009, 05:12 PM
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Quote:
Originally Posted by pavetim
Well since you guys are in transmission discussion i'm putting a Lq4 in my 98 chevy. It has a 4l60e. I need to be able to tow 5000lbs long distances without problem. Hence the 6.0L. But i was told I should swap to the 4L80e. What would you guys recommend for the truck so I can tow and still get good fuel economy. 4L60E with a controller, 4L80E, or 200R4? or one of the other L70e, 60e etc.
The big problem with the 4L60E in pickups is keeping them cool, the other problem you will have is the result of the condition that automatics wear out at about the same rate as the engine they're attached to. This is to say as the engine ages and looses power, the transmission also ages and looses its ability to manage power. When an old automatic is faced with a frisky ne engine, what remains of its life expectancy goes pretty fast.

200R4 is out, these are not meant for trucks no where near strong enough and have a higher ratio in low making the launch of a heavy truck rather not inspiring. A rebuilt and beefed 4L60E, 4L65 or 4L70E with controller would work. The 4L80E with controller would probably be over-kill; which I would consider to be just right.

What-ever you use, it must have a good size external cooler. Towing puts a lot of load on an automatic and the in-radiator oil cooler is just not sufficient. But cooling the oil isn't simple, if you avoid the radiator cooler completely, then you need a thermostatic by-pass so when the weather is cold the trans oil is not routed thru the cooler till it reaches about 180 degrees. If you route thru the radiator's heat exchanger without by-pass, then I recommend going thru the external cooler first, then thru the radiator exchanger to warm the oil up a bit. You just don't want to be dumping ice cold oil back into the trans any more than overheated oil.

Bogie
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Old 11-17-2009, 08:55 PM
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If the LQ4 came with the 4L60E, you might want to check the towing capacity of the vehicle it came from, it could be good enough, 5000lbs is not that bad.
A 4L80E is heavier inside, so not as good on gas, but I do not know by how much.
Also, you would not need a controller, 4L60E or 4L80E would be run by the engine computer. Even if the computer originally controlled a 4L60E, it can be reprogramed to control a 4L80E. Speartech is good for reprograming and harness mods.
By the way, cooler manufacturers usually recommend sending the fluid first through the stock radiator then through the extra cooler...
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Old 11-17-2009, 09:16 PM
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5000 lbs is not unreasonable to pull long distances with a 6.0. In fact it's suited quite well for that. The 6.0 is a darn good engine and I think that, even though it would be nice to have, a diesel would be overkill for 5000 lbs.

My boat and trailer weigh nearly 5000 lbs and I've pulled mountain passes at 55-60 in 4th gear in my 2000 Silverado 2500 with an LQ4 without any problems. The last time I made the trip across Snoqualmie pass here in Washington State I averaged 13.7 mpg. There's no way a diesel would come anywhere close to doubling that and even at a 25% improvement in mileage it would take a long time to recoup the added cost of buying the diesel. Granted, my truck has a five speed manual and 3.73 gears. Both of which are unusual for these trucks.

As far as transmission choice, I'd probably go with the 4L80E. I think that's the only automatic GM put in the gas HD 3/4 tons that didn't have the 8.1 and the 6.0 wasn't offered in the 1/2 tons. (special GMC Sierra models excluded) Gearing is up to you. I've pulled a Case skid steer weighing 8000 lbs (including trailer) with my 3.73 gears with no issues.

Last edited by Blazin72; 11-18-2009 at 02:18 PM.
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Old 11-26-2009, 11:42 AM
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Like pretty much everybody else has said I'd go with the 4l80e. Better to be safe than sorry.
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