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3.42s Plus 4 Speed Trans?

jro909

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jro909 Senior Enthusiast

jro909

Posted
Posted

3.42s coupled to the 4 speed trans equal a terd in your guy's books? i have 3.42s and it seems like i have to get on it a bit more to get moving faster from a stop or to pass on the highway, i don't even break 2k rpms going 65 on the highway lol

KMGZ400 Senior Enthusiast

KMGZ400

Posted
Posted

my friends got a 95 silverado with 3.42 and the 4 speed and it is an absolute dog. but then again its almost 15 years old

GPSilverado Enthusiast

GPSilverado

Posted
Posted

I have the 3.42 with the 4l60e in my truck. With the 20" wheels (tires are 31.8" tall) it definitely needs more gear. I am trying to decide if I will go with the 3.73 or the 4.10 when I make the change. Towing the 6000lb boat is OK once moving, but starting off is sluggish. I usually tow in 3rd gear due to the gearing.

 

My next truck will not have the 4 spd with the 3.42 (obviously not available now on the V8 EC or CC trucks) but will instead be the 6.2, 6 spd, with the lowest gear I can order (hopefully 3.73).

 

I took what was on the lot last year, since the deals were so great.

oldscsc Enthusiast

oldscsc

Posted
Posted

Not bad at all. It's pretty peppy around town (or will be once I get the busted up cats out of there). 2,000 RPM at 72 exactly, and a little over 1000 RPM at 40 = 16 city and a little better than 19 highway.

Willshire Enthusiast

Willshire

Posted
Posted

Puttin Eaton lsd in my 2000 on tues with 3.73s right now 3.42s with gm posi (crap or wore out). A real dog 1st,2nd 3rd ok 4th at 50mph bluhbluhbluh. All told posi,3.73s,and bearing kit $925cdn plus install (400). We'll see on tues. Blackbear tune in july

huero626 Senior Enthusiast

huero626

Posted
Posted

With all my GM trucks I've always had 3.73 gears with the 4 speed, so I've never experienced a 4 speed with 3.42. My next GM will most likely come with 3.42 but that truck will come with the 6 speed automatic.

kdm101 Enthusiast

kdm101

Posted
Posted

yeah... 3.42's definitely suck. Trying to accelerate you've got to slam it so it will downshift way low to get moving. With the 4.8... it's even worse.

 

Puttin Eaton lsd in my 2000 on tues with 3.73s right now 3.42s with gm posi (crap or wore out). A real dog 1st,2nd 3rd ok 4th at 50mph bluhbluhbluh. All told posi,3.73s,and bearing kit $925cdn plus install (400). We'll see on tues. Blackbear tune in july

 

I'll be there! I want to do the gears to 3.73 (I think 4.11 would be too low as this is a daily driver), so my plan is to get an axle assembly from a salvage yard and rebuild it, then swap it whole to my truck. Finding one without the G80 would probably be easier and/or cheaper when I do get one.

Willshire Enthusiast

Willshire

Posted
Posted

I was goin to buy a used for 1100 but the scrapyard took the cover off and found a piece of metal in the bottom and i hear great things about the new eaton lsd even vs the auburn. Eaton is also rebuildable.

Z'06 Enthusiast

Z'06

Posted
Posted

The biggest variable is going to be what size tire diameter you are running. 3.42 w/ 33" tires will be a turd off the line compared with 3.42 w/ 30" tires (not to mention harder on your engine and transmission), but will probably have better highway MPG due to lower RPMs at higher speeds (whereas the 3.42 w/ 30" tires will do better mileage-wise in-town).

truckofwinandawesome Senior Enthusiast

truckofwinandawesome

Posted
Posted
yeah... 3.42's definitely suck. Trying to accelerate you've got to slam it so it will downshift way low to get moving. With the 4.8... it's even worse.

 

does that mean the 3.23 is Even Worse than 3.42 with the 4.8?

welscher08 Enthusiast

welscher08

Posted
Posted
yeah... 3.42's definitely suck. Trying to accelerate you've got to slam it so it will downshift way low to get moving. With the 4.8... it's even worse.

 

does that mean the 3.23 is Even Worse than 3.42 with the 4.8?

 

 

 

Yes.

jro909 Senior Enthusiast

jro909

Posted
  • Author
Posted

i'm not really wanting a speed demon truck, i was just curious if all 3.42s with the speed are a tad slow off the line...i'm just rolling on 255s for tires nothing crazy

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