Good Sam Club Open Roads Forum: Tow Vehicles: GM and Gearing
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jffnkrn

peoria

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Posted: 10/14/20 07:19am Link  |  Quote  |  Print  |  Notify Moderator

Looking at maybe an upgrade to GMC 2500 HD, just curious if anyone has the 342 gearing and what they think. It would be with gas. your experience if you please. I have a comparison of the 3:73 and 4:10.
thanks

BenK

SF BayArea

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Posted: 10/14/20 07:36am Link  |  Quote  |  Print  |  Notify Moderator

They are around 10% apart...meaning about 10% torque multiplication difference...more if going up numerically and ditto going down numerically

Factored by the transmission gearing & number of gears...this includes tire revs per mile being the same

Of course gasoline vs diesel factors


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

Lwiddis

Monterey, California

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Posted: 10/14/20 09:56am Link  |  Quote  |  Print  |  Notify Moderator

What will you will tow, how much will you use the truck without a load and where will you be going with a load?


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watt solar-parallel & MPPT, Trojan T-125s. TALL flag pole. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist14 yr. Army vet-11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


Grit dog

Black Diamond, WA

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Posted: 10/14/20 10:01am Link  |  Quote  |  Print  |  Notify Moderator

It sure I’ve seen that tall of gears in a GM HD gasser since the 80s models.
They’ve only offered 4.10s for several years now.
Regardless of all that, if you’re towing anything substantial get the deepest gears you can. Mileage will s uck just the same.
If you’re only hauling heavy loads like firewood and don’t really tow , then the pavement princess gears will be fine. Idk where you’ll find them though in anything built in the last 20+ years or more.

Be less vague with your question.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

MARKW8

Akron OH

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Posted: 10/14/20 10:13am Link  |  Quote  |  Print  |  Notify Moderator

Which transmission? I don't think you would want the 3.42 if it's a 6 speed.
Mark

MFL

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Posted: 10/14/20 11:51am Link  |  Quote  |  Print  |  Notify Moderator

What year 2500? Earlier model 3.73 was standard, and then about 14 4.10 was standard. IDK if 3.42 was an option?

Jerry





Grit dog

Black Diamond, WA

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Posted: 10/14/20 02:19pm Link  |  Quote  |  Print  |  Notify Moderator

jffnkrn, come in....you gotta copy?
What mystical model do you have?

Grit dog

Black Diamond, WA

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Posted: 10/14/20 02:23pm Link  |  Quote  |  Print  |  Notify Moderator

NVM, figured it out. 3.42s were offered in K20s or K2500s between 1984-1987, with the 350 or the mighty 6.2 diesel.


What do I win?

blt2ski

Kirkland, Wa

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Posted: 10/14/20 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

Grit,
You win nothing!

For the rest of you, I guess grit too! Not sure why......

For 2021 the two GR options are 3.42 or 3.73 behind the 6.6 gasser. I don't recall looking this up las week if that motor has the 6 or 8 sp auto behind it.
If the 6sp, I'd be ok with the 3.73. would have to do some number crunching on the 3.42.
Need to look up gear ratios on 8sp to see if first is lower than the 4.10 1st gear in the 6sp. Is so, then a 3.42 could work on all ends, possibly get you some decent mpg's on freeway empty at 60-65 mph.
I do a lot of 0-50, a bit at 60. Almost none at 70!. So 3.73 generally speaking is best for me. Would prefer 4.10s even with the 6sp.

Marty


92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
00 Chev C2500, V5700, 4L80E, 4.10, base truck, no options!
92 Red-e-haul 12K equipment trailer

Check RV.Net Blogs at: blog.rv.net

blt2ski

Kirkland, Wa

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Posted: 10/14/20 06:31pm Link  |  Quote  |  Print  |  Notify Moderator

Now that I look it up. the 3.73 is gas only, 3.42 is a diesel option, At least pricing a building a gas version. Gas has the 6 sp auto, diesel the 10 sp.

marty

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