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3.42 gears

Anybody got them with a 5.3 4x4?

3.42 gears

Postby arky11 [OP] » Feb 23 2011, 12:38pm

Found a great deal for an 07 ext cab 4x4 1500 5.3. Only problem is it has GU6 code, which is 3.42 gears. I've been looking for 3.73s because I live in the Mountains (little mountains:). Anybody have them? What do you think of them? What rpms' are you turning at 70 mph? Does it shift in an out of OD alot when you're in the 50-60 mph range?
Thanks, Gabriel
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Related Topics  Are rear end gears the same as front end gears on a 10 bolt   3.42 gears   gears!   No Gears   New gears???   Gears   3.42 to 4.10 gears   Gears   4.8 With 3.73 Gears anyone?   Gears   Gears   towing gears   how do I find out what gears i have   Another gears post 
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Re: 3.42 gears

Postby Hartski » Feb 23 2011, 1:08pm

Should do fine unless you tow/haul a lot.
in omnia paratus
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Re: 3.42 gears

Postby GMman » Feb 23 2011, 8:24pm

The dealer here orders all new trucks with 3.42 with V-8, other dealer orders 3.08 with V-8 engine. Mine shows over 9500 lbs towing with the package I have. I run 285 75r tires also. No problems nor no problems with my 07 NBS crew 4x4 with 3.08 4.8 V-8. We don't live in the mountains, but go up into some every once in a while. Mine have all had the hd trailering package too. Hook it up and pull with it and see if you like it.
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Re: 3.42 gears

Postby EKinMN » Feb 23 2011, 11:07pm

Another +1 for the 3.42 gears. Perfect combination. Remember, the new trucks have a 6 speed tranny, which changes the ratios enought to make the 3.42 a very strong towing truck.
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Re: 3.42 gears

Postby arky11 [OP] » Feb 24 2011, 2:17am

Ok fellas, now I need some numbers. I test drove two trucks today, both 04s. One had 4.10s (GT5) and hit 2k rpms at about 63 mph. The other had 3.73s (GT4) and hit 2k rpms at about 71. My 01 Tahoe also has 3.73s.
What rpms are you guys with 3.42s running at 70 mph? Or what mph do you hit 2k rpms at?
Seems like it must be 78-ish mph at 2k, which would put the rpms way down by 1,200-1,300 at 55-60 mph. Seems really low.
Talked to a guy with an 06-ish Z71 with (he thought) 3.42s. He regularly gets 18-19 mpg around here, and has gotten more based on his computer readout. Stock truck. Impressive. Now I need to verify his gear ratio...
Oh, and all this is for an 02-07 truck. Regular old 4 speed auto, I wish I was in the market for a 6 speed, but not yet.

Thanks
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Re: 3.42 gears

Postby gmctruckguy » Feb 24 2011, 3:41am

Cruising @ 70mph engine is @ about 1900 - 2000rpm and @ 60mph engine is @ 1850rpm. I drive in hilly areas and rarely feel it shift out of Od. All around it is pretty good combo
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Re: 3.42 gears

Postby sportredtruck » Feb 24 2011, 3:56am

You all probably already know this but when comparing speed and RPMs you have to take into account the tire size, are they the same or different. Even a little change in size will change the other. Also, when I bought my O7 I remember all to the ext. cabs having the 3.43 gears...was it standard?
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Re: 3.42 gears

Postby tsduke » Feb 24 2011, 4:30am

05 Z71 with 3.42 and 265/70/17 tires. At 70 I'm around 1800. I think it takes 75 or above to hit 2k. 55-60 is 15-1600 if I remember right. There is math to figure all this. I'll see if I can get it.

With a decent hill, my truck torque converter will unlock, on a pretty steep hill, like going through the Ozarks last summer it would kick down to 3rd to hold cruising speed.

Found some calculators. My #'s are pretty close here. http://www.ringpinion.com/Calc_RPM.aspx
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Re: 3.42 gears

Postby GMman » Feb 24 2011, 5:04am

Up to dealers to order what package, gears, engine or combo they like. Guess every dealer is different to what they sell. Around here most trucks are loaded you would have to have a WT version brought in from another dealer as these don't seem to order any.
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Re: 3.42 gears

Postby arky11 [OP] » Feb 24 2011, 12:47pm

Again, I'm talking about 4 speed auto trucks, 02-07. You fellas with 6 speed autos are going to have completely different numbers.
And yes, tire size makes all the difference in the world. You can compensate for 4.10s by putting on larger tires, but then you have more wind drag and rolling resistance.
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