Will I really feel the difference between the 3.92's and the 4.56's? Is the difference in accleration that big as some are saying. Do you think a subtraction of 3tenths of a second in my 1/4mile time is possible, my best time is 15flat at 90mph.

 

Yes, u will tell the difference. Do u have the 20's. 3.92 is a good gear, but the 20s are so big the take some of the gear away. I dunno bout the 1/4, but u will accelerate faster but could run out of gear and top out quicker and have nothing left. But in the 1/8 u will be faster i know.

 

You will feel a big difference in acceleration. Don't know about 1/4m changes but I have the 20's and 4.56 and I'm only around 5100 or so in 3rd gear at the end of a 98mph 1/4m. So, that means you will not run out of gear.

 

Well you also have the ststurbo. Anyone here have the 4.56gears with just simple bolt-on's? Want to know what the accleration differneces are from stock. Are they worth $750 it will actually cost with buying the gears and installing them?

 

I put my gears in before the turbo. I felt a major increase in seat of the pants acceleration with just my cai and exhaust at the time.

The turbo gets my speed up quicker and I still had plenty of gear to go, so they will be fine for a non turbo truck.

 

I guess I'll go for it then. You said you had a 98mph trapspeed with just CAI, exhaust and the 4.56gears. Thats atleast a 14flat or at the slowest a 14.2 So I would run atleast a 13.5-13.8 with those modd's cause my regular cab is about 300-450pounds lighter then a QC. Now what about traction is that a big problem I have heard that it is?

 

Not with stock 20's and LSD.

 

You talking about the traction issue's? Was told ease into the throttle untill you get to around 15-20mph thenm get on it. But that would give you bad times in a 1/4mile.

 

Let me clarify.

I put the gears in before the turbo and felt the big difference.

Then I put the turbo in and did 98mph in the 1/4 and still had plenty of gear.

So what I'm saying is that even with the turbo, there is still plenty of gear, without it you will have even more gear.

LOL!!, the stock 20s and lsd was for another thread, probably in another forum about smoking the tires, LOL!

 

I think the 4.56's are a tad tall up high. Something just doesn't match the engine tq output curve to the 1:1 ratio with that gear or something. Hard to explain.

It's a huge difference coming off the line and shooting through town. I've seen 3 before and after ET's posted on DTW and all were roughly .1 to .15 better in the 1/8 mile after the gears. However, all 3 showed the same 1/4 ET as with their previous gear sets. So city driving and 1/8 mile racing is much better. 1/4 mile racing is yet to be proven.

I say go for it. You won't be disappointed.