3:73's or 3:90's?
07-06-2005, 04:41 PM
#21
Originally Posted by Tractionless
I think Tib means higher gears (lower numerically) work better from a roll since the tranny stays in the powerband of 2nd gears longer and the truck keeps puling till it shifts into 3rd.
Now, I can understand a nice 3-2 or 4-2 downshift at slower freeway speeds, is that the idea? or are we really talking "from a roll" on the highway?
07-06-2005, 05:02 PM
#22
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Originally Posted by moregrip
fwiw, I have recently owned two trucks with 30.5" tires. One with 3.73's and one with 4.10's. In any test of acceleration from a dead stop or at freeway speed the 4.10's won out, everytime.
Now, at freeway cruising speeds, the 3.73's were slightly nicer due to the lower rpm @ 70-80mph.
Now, at freeway cruising speeds, the 3.73's were slightly nicer due to the lower rpm @ 70-80mph.
I always tought higher gears worked better when racing or passing at highway speeds. I think it all depends when the tranny upshifts into the powerband, the truck is gonna pull better. If the tranny shifts from 4 to 3 and the rpms jump to 4000, then the truck is not going to pull as hard as if the tranny had shifted from 4 to 2 and the rpms jumped to over 5000 rpms. Lower gears tend to do that. 
I don't know all I know is that I need some 4.10s cus I race mostly at the track and 3.42s stink off the line.
Last edited by Tractionless; 07-06-2005 at 05:54 PM.
07-06-2005, 05:44 PM
#24
TECH Veteran
My 3.73's were 'longer' and there was more of a punch when they downshifted at speed. When I nailed it at 70 mph, there was noticeably more power, and the power lasted longer before upshifting.
The only variable was gearing....I drove my truck with 3.73's, and the exact same truck again with 4.10's. While the 4.10's certainly gained off the line, once up over 35 or 40 mph, the benefits of the 4.10's were gone....the 3.73's had the advantage.
The only variable was gearing....I drove my truck with 3.73's, and the exact same truck again with 4.10's. While the 4.10's certainly gained off the line, once up over 35 or 40 mph, the benefits of the 4.10's were gone....the 3.73's had the advantage.
07-06-2005, 06:05 PM
#25
Originally Posted by Naked AV
My 3.73's were 'longer' and there was more of a punch when they downshifted at speed. When I nailed it at 70 mph, there was noticeably more power, and the power lasted longer before upshifting.
The only variable was gearing....I drove my truck with 3.73's, and the exact same truck again with 4.10's. While the 4.10's certainly gained off the line, once up over 35 or 40 mph, the benefits of the 4.10's were gone....the 3.73's had the advantage.
The only variable was gearing....I drove my truck with 3.73's, and the exact same truck again with 4.10's. While the 4.10's certainly gained off the line, once up over 35 or 40 mph, the benefits of the 4.10's were gone....the 3.73's had the advantage.
I don't understand the vast difference, when I had 4.10's and you had 3.73's and we raced at highway speeds didn't I pull on you every time?
07-06-2005, 07:19 PM
#26
Originally Posted by moregrip
I still don't follow your logic exactly. Sure a 3.73 will pull a higher mph but is that top speed really going to make a difference at highway speeds? which to me, would be 100mph and less.
Maybe more people are racing around faster than 100mph than I realize, although I haven't seen it.
could you explain this to me as I may be missing the point here?
Maybe more people are racing around faster than 100mph than I realize, although I haven't seen it.
could you explain this to me as I may be missing the point here?
I have a friend with an Ext Cab 5.3 with bolt ons and 4.10's who ran a best time of 14.6. I raced him with my wife's 4.8 ext cab that ran a best time of 15.0 with 3.73's and he would pull from a dig or a low speed roll. On the other hand, when we would do high end pulls I would always pull on him. These high end pull I am taling about are 70+ and shut off at 120+.
07-06-2005, 07:41 PM
#27
TECH Veteran
Originally Posted by moregrip
have you adjusted any of your shift parameters since the swap? that might help some.
I don't understand the vast difference, when I had 4.10's and you had 3.73's and we raced at highway speeds didn't I pull on you every time?
I don't understand the vast difference, when I had 4.10's and you had 3.73's and we raced at highway speeds didn't I pull on you every time?
Look, Devin, I don't understand why you insist on going toe-to-toe with me every time on this. It seems you want the facts to be different than what they are, and you want my experience to be something other than what it is. You really should entertain the possibility that you are wrong on this. You also may want to pay attention to what other people with experience (hint: some are right here in this thread) keep saying over and over again on the matter.
From now on, I would appreciate it if you would just let me state my opinion and experience in response to questions like this without challenging me every time on it. It's getting old. Just state your opinion and experience, let me do the same, and we'll leave it at that, okay?
Now, back to your regularly scheduled programming...
07-06-2005, 09:55 PM
#28
I think what you should be taking into consideration is that we are racing trucks and having to fight weight and aerodynamics. When it comes to acceleration the lower gear will be on top(two trucks being identical with same mods). With a 3.42 or 3.73 gear a downshift to 2nd from 60mph will hold 2nd until just say about 85-90mph while the 3.90 or 4.10 will only hold to 75-80mph(all depending on shift points). When you shift third with the higher gears aerodynamics come into play due to high speeds and the engine will struggle a bit while the lower gears will able the engine to rev a little easier to push the brick. So between 100-130 the truck with 3.90/4.10 gears will be more in the powerband. This is just the way I see it, I could very likely be wrong.