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Old 04-05-2004, 07:15 AM   #15
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Well, of all the issues, with the setup, my only concern at this point it the trans. The engine (even if yours is a non LT1), is more than up to the task. I towed the Bambi fully loaded at or near the 4600lb GVWR up some fairly steep hills in the Louisville area with 2.93 gears. I installed a trans temp gauge and can monitor the trans at a glance. I have noticed that with the 3.73s, the trans temps get very slightly warmer not towing. So, to that end, to picked up another factory trans cooler and am in the process of placing in paralell to the existing oil to air cooler for additional trans cooling.

After towing the Safari around town in several different situations (minus hills), I would say that with 3.23s(which was installed on the police packages mostly) you could do just fine, as long as you keep the trans cool and happy!

Of course, I have no plans to go to areas similar to the Rocky Mountains.....

BTW, I just placed a very small amount of the Reese Teflon lube on my bars where they connect to the cam yesterday. I haven't taken the coach anywhere since I've done it, but I am sure based on the info here, it should be much more quiet!

Eric
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Old 04-05-2004, 11:50 AM   #16
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Well, of all the issues, with the setup, my only concern at this point it the trans. The engine (even if yours is a non LT1), is more than up to the task......

Well, the unit I tow is much heavier than that, dangerously heavier and longer. This truck handles it wonderfully, but Caprice?

Maybe I should buy a Caprice or better yet a Buick Roadmaster already converted for some serious towing. 3.73 or 4.10 rear axles, heavy duty 4L80 tranny, shocks, etc. But then as a specialty item, it will probably ruin its resale value, who wants 4.10 in a grocery-getter (aside from some very dedicated B-body people).

I am however pleased to see that you've made your work for you, if I ever get a smaller and lighter 25' unit, that would be the way to tow.
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Old 04-05-2004, 03:53 PM   #17
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I totally agree. I'm at the high end of my limits even with the mods I've made....I by no means meant to suggest you should get one for you 32'!

It is funny, but I know a handful of folks that run 4.10s in the B. The 3.73s is a bit much in the RPMs, even in "OD". Thing is that even with the 3.42s, the RPMs are only about 300 more. Couldn't even imagine going 4.10s!

Hopefully this week I'll be able to get that additional trans cooler in!

I really want a Duramax/Allison 2500HD.....mind willing...wallet weak!

Eric
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Old 04-05-2004, 05:04 PM   #18
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A bit much for RPMs is when it is turning 3,000 at 65mph.
I would actually prefer to downgrade to 3.55 rear or even 3.23.

Ah well, membership has its price.
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Old 04-05-2004, 07:06 PM   #19
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Actually, with 3.73 and a properly set T/C, I documented my RPM running:

2188 in OD
3130 in 3rd

w/17" rims at 65mph.

What do you think of towing in OD if the car is not hunting for gears, the trans temp is at 175 and the T/C is locked at 48mph?

Just bouncing some ideas....

Eric
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Old 04-22-2004, 08:04 AM   #20
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Hm, interesting. I didn't know there was that much rpm difference between OD and 3rd.

As for towing in OD, I am no expert on trannies, but from what I learned about it, towing in OD is not a good idea with 4L60 (E) for reasons other than temperature.

There was a good article on the matter floating around, explaining why OD is the weakest link in that specific tranny. Now 4L80, the heavy duty stuff is something else.

I towed with 4L60 a few times but it was around 4-5K lbs and the 5.7L tbi /3.23 struggled. I got abysmal gas mileage at 70, it was something like 11mpg.
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Old 04-22-2004, 10:40 AM   #21
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Well, the way I understand it, is that 4th is the overdrive gear and will downshift more frequently when in the overdrive gear selection.

I've seen many of the reasons about not towing in overdrive. I think, (and don't hold me to this) that the only real difference in the tow/haul is that it changes the shift points and does not allow as much hunting as a vehicle that does not have the tow/haul mode. That said, the truck still tows in overdrive, it's just modified by the tow/haul button I believe.

At any rate, were taking it out on a few shake downs soon and will get about 80 or 90 miles each trip of real world input.

I'll let you know if my poor 4L60E can hang with it's more robust 4L80E brother. I sure hope so, as I have sort of bet the farm that this car will deal with the Safari for 3 or 4 years (hopefully without a bunch of trans rebuilds)!

Eric
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Old 04-22-2004, 11:00 AM   #22
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So Eric.

Am I correct to assume that when towing the Bambi on an expressway, I should keep the Trans. selector at 3?

My set up: Park, Reverse, Neutral, Drive, 3, 2, and 1.

Would I ever want to go to Drive?

Thanks.

Clevis Pulley
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Old 04-22-2004, 11:08 AM   #23
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Not in O/D

Drive is O/D. I highly recommend using "3". Also, never put your tranny in nuetral to coast down hills, etc, thinking you'll save gas mileage...that stops the tranny fluid from circulating, and you'll blow out your transmission, at least that what Chevy told me.
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Old 04-22-2004, 01:11 PM   #24
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It really depends on the car as torque converters lock differently on different brands and models.

The Impala SS has P R N D D 2 1

The first D allows the car to go into 4th gear and will downshift faster than if placed in the second D which is 3rd.

My guess is that if I'm in the first D, which is the overdrive gear (4th), and my TC is locked, I will still have fluid moving around as needed, the trans will stay cool, but if it starts to hunt on hills and such, go into regular D which in my case is 3rd.

See the issue is that I have 3.73s and if I stay in 3rd at say 60 or 65, the RPMs, even with 17" rims is high, thus the overdrive (4th) that keeps the RPMs down. My torque converter locks at 51mph.

Eric
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