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Old 12-30-2012, 04:32 AM   #1 (permalink)
VanBoy
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3.42 ratio C2500- tow ratings

Posted in the tow section, got no replies.....

Okay, the above vehicle is new to me (fixing the gremlin issues now). It is a 1994 C2500, six lug (7200gvw) with the auto/overdrive with a 3.42 axle. It looks like it has never towed, no wiring, no hitch (bumper hitch, but it was used for holding flagging signs-old county road crew truck).

From my reading and such, I was told that the factory tow rating is 4000lbs for my year and configuration. (True- yes/no).

Also, the driver door has a sticker that says NOT to use over drive when towing OR hauling "heavy" loads. Okay, what is considered a heavy load? Truck is suppose to be about 3500lbs empty (have to look on registration). So if I have near max GVW, stay in drive? Would love to have a 1994 owners manual (or/and tow manual) but I'm at a loss....pickup didn't come w/ one.

So, basically, I am asking for people who have owned a similar ratio truck and have towed. Personal experience? Thanks.
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Old 12-30-2012, 05:56 AM   #2 (permalink)
CrazyRay
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I think you should find out what transmission you have and if your converter locks. I have. 1998 C2500 6 lug 6.5 TD 3:73 rear end and I have never noticed any stickers you have. Mine is OBDII and PMD controlled IP.
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Old 12-30-2012, 08:49 AM   #3 (permalink)
PrivatePilot
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The warning to not tow in OD is due to the low rear end ratio - you'll find that the truck will shift up and down a LOT if you pull with it, and constantly hunting is a recipe for a lot of heat buildup in an automatic transmission.

Pulling it down to 3rd will cause it to run at a higher RPM and make it less susceptible to gear hunting which will help keep it cooler.

Of course, common sense prevails. If you're pulling a tiny trailer that the truck doesn't even realize is there, use OD..but if you're pulling at (or near) it's rated capacity, with 3.42's, you'd definately want to consider following the advice - at least pay attention to what the transmission is doing and act accordingly.

A trans temp gauge is easy to install on the 4L80E (test port, drivers side, remove plug, thread in sensor, done) so it may be wise if you thinking about towing heavy. A pyro is another wise investment, especially with that gearing.

You'll find that with the 3.42's your towing performance will be lacklustre at best when you get into heavier loads, so pay close attention to things.
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Old 12-30-2012, 09:48 AM   #4 (permalink)
57diesel
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Does he possibly have the 4L60?
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Old 12-30-2012, 01:17 PM   #5 (permalink)
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Quote:
Originally Posted by PrivatePilot View Post
The warning to not tow in OD is due to the low rear end ratio - you'll find that the truck will shift up and down a LOT if you pull with it, and constantly hunting is a recipe for a lot of heat buildup in an automatic transmission.

Pulling it down to 3rd will cause it to run at a higher RPM and make it less susceptible to gear hunting which will help keep it cooler.

Of course, common sense prevails. If you're pulling a tiny trailer that the truck doesn't even realize is there, use OD..but if you're pulling at (or near) it's rated capacity, with 3.42's, you'd definately want to consider following the advice - at least pay attention to what the transmission is doing and act accordingly.

A trans temp gauge is easy to install on the 4L80E (test port, drivers side, remove plug, thread in sensor, done) so it may be wise if you thinking about towing heavy. A pyro is another wise investment, especially with that gearing.

You'll find that with the 3.42's your towing performance will be lacklustre at best when you get into heavier loads, so pay close attention to things.
They all got the warning label about towing in OD as 2500 BURB with 4.10's had it(don't pay any attention to it now as I got a bit more power, so the 3.42's don't really phase it).
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Old 12-30-2012, 01:31 PM   #6 (permalink)
VanBoy
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Quote:
Originally Posted by 57diesel View Post
Does he possibly have the 4L60?
I have a 4L80-E according to the VIN decoder.

I understand the "hunting"= heat creation. The only experience I have with towing is w/ ratio's of the 3.55 area. My old F150 w/ the 4.9L I-6, C6 auto w/ GV overdrive has a 3.55 axle ratio. And my diesel van's have 3.54 and 3.55 ratio's. I don't two that much, only local to bring my tractor to the local shops. Seldom long distance w/ heavy loads. Any how, I have my PS van for long haul towings of my equipment trailer. And I even shut off the OD on my van when I hear it down shift.....I know better.

Flat ground, shouldn't be an issue w/ what I haul. Most of it will probably be at most, a bin of apples or two (avg weight is 850lbs each) and that's only five or so miles away. Since I don't have a tach, I really can't tell when it shifts into OD or speed. Seems really smooth shifting (the tranny was replaced during the life of the truck according to the seller records. It spent it's life hauling a in bed tool box and fuel tank).

I was just curious what GM may have meant as a "heavy load".
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1990 Ford E-350 7.3L IDI Club Wagon, 3.54LS x2
1994 Chevrolet C2500 6.5L TD, 3.42
1981 VW Rabbit Pickup 1.6L N/A x2
1978 VW Rabbit 1.5L N/A
1977 KW K100 NTC-350, twin screw semi
1977 IH Transtar II NTC-290 single axle semi / IH Transtar II NTC-290 twin screw semi
================================================== ==
Stanadyne PMD installed 6/13 replaced- reinstalled D-Tech ,Soot Trap Delete Jan 18, 2014 / Heath TurboMaster Dec 22, 2013 / New OPS (BWD), OPS Relay mod,
black Stanadyne PMD w/ #5-June 2013 / Dorman relocation kit, D-Tech PMD to bumper, #9 resistor- Jan 2013 / Carter Lift Pump, P74143 10-15psi, 32gph- Dec 2012 / Brought home Dec 17, 2012

Other then that, the Chevy is STOCK.
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Old 12-31-2012, 01:49 AM   #7 (permalink)
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Did they even put the 4l60 behind the 6.5? my '95 1/2 ton 6.5 still had a 4l80..
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Old 12-31-2012, 09:23 AM   #8 (permalink)
57diesel
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I have seen mention of 60's behind diesels. Thinking it may have been most common in maybe something like a Tahoe or Blazer? Perhaps the thought was that those type of rigs were not as likely to be used for as heavy of loads as the pickamaups?
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Old 12-31-2012, 09:32 AM   #9 (permalink)
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I think the 60's went by the way side with the 6.2.

My Tahoe has the 4L80E with 3.40 gears & IME they are perfect fit for the TQ & power curve of the 6.5.

I also have a friend that tows regular with the 6.5 4L80E & 3.40 gears with no issues what so ever.

My truck has the 3.73 gears...MT all the 3.73 gears do is waste fuel IME & IMO
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Old 12-31-2012, 10:36 AM   #10 (permalink)
JorgeNY
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Im pretty sure all 6.5s had the 4l80e unless it was a manual.
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