ele-blue95

iTrader: (10)

Tonight i ran at the track and ran 13.3s @ 106.18 Mph w/ 2.108 60'. The car was running 12.48 @ 112.27 w/ 2.089 60'. The only things i've changed between the runs was a Strange dana 60 with true trak and 3.73s vs. stock 10 bolt w/4.10s , mild steel driveshaft vs. stock alum. and I had the t56 trans with a rebuild by Joe and Amber @ t56 rebuilds. No other changes. And I noticed the stock tach and speedo started jumping back and forth during the shifts (only at the track, not on the street). The only thing i can think of is the clutch slipping. But the clutch feels like it is grabing really good (spec stage II). Not sure what is going on. Any help please!

Ralls

iTrader: (32)

Wasn't it humid as hell where you are? It's 90% humid here and the weather channel showed it coming up right through AL.

GIZMO

iTrader: (8)

Less gear and more rotating weight.

titter

iTrader: (5)

less gear, more rotating weight, and a worse 60'. the dana 60 is a beast of a rear end, and it will cause a lot more drivetrain loss, espcially compared to a 10 bolt with 4.10's. since you have a d60, and you have dr's ... your 60' is killing you. 1.6-1.7 should be obtainable with a good launch, even with mild suspension mods. practice that launch, and i would think of a way to get a little more power to the wheels ... nitrous should do the trick.

LT1Falcon

iTrader: (3)

i wouldnt think the added weight would lose you that much, but i guess more weight+bad day at track could equall that much. i mean you can go to the track on different days with the same stuff and run a tenth or 2 different

96capricemgr

iTrader: (1)

Rotating weight hurts worse than dead weight.
IMO the Dana 60 is just silliness that is the rear all the guys with big mud and rock crawling trucks want. absolutely foolish to put one in a car like this and here you can see the results. I do think weather is a part but that axle is just too big.

The b-bodies have VERY few problems with the 8.5" 10 bolt despite all our extra weight, our 30 spline unit is comparable to the 12 bolts of old. For a street f-body that needs an axle upgrade I think the 12 bolt a good choice because I know it is available the 30 spline 10 bolt 8.5 would do if someone built it. On a race car an 9" will do the trick. Leave the Dana 60 to the off roaders.

This is the same "more is better" mentality so many of you apply to the cams and it is working just as "well".

Burning Rubber

iTrader: (1)

my lil brother went to the track with a taller tire last night and lost .5 seconds and 2-3 miles per hour. just from the tire being taller. that again goes back to more rotating mass. i suppose that really hurts ETs. he went from a 26' to a 28'.

GIZMO

iTrader: (8)

You would be surprised how much performance you can gain or lose in drivetrain weight/resistance. I would be running a 7.5" 10-bolt if I thought it would live. Instead I have a 12-bolt with gun drilled axles, an aluminum spool and yoke, titanium wheel studs, and aluminum lug nuts. I also only run one quart of gear oil.
I once lent a TH-350 to an LS1 buddy of mine. He swapped out his race prepped TH-350 for mine and gained over a tenth (and it wasn't even my best TH-350).
The steel driveshaft is also a great way to rob power.

GIZMO

iTrader: (8)

The taller tire would probably like more gear.

Greenfire

iTrader: (2)

I think the Dana 60 is a bit much for a street/drag F-body. Like with mine I really want to put a 12-bolt in it and the hubby thinks I should go for the 9-inch. Honeslty my car is a street/drag car so I don't see the point in a 9-inch. I'm sorry you lost so much on your ET's Eric, maybe you can swop it and find a good deal on a 12-bolt. Maybe up the gears back to 4.10's, Clint kept his in the 9-inch I think they are 4.11's. He lost some with the 9-inch but I guess we'll never really know how much until he returns to the track for some good ET's.

dhdenney

iTrader: (53)

That's the price you pay for your **** to hold together. I'd run a 10 bolt and aluminum d/s if I could. Too bad I already busted an aluminum shaft and not willing to chance the 10 bolt. One thing about it, you're all set for a big *** motor! Instead of worrying about what you lost, build a hellatious motor and put that big stuff to work.