MikeWS6

9 inch with 4.10 gears. Can I plan on losing 30rwhp on the dyno coming from a 10 bolt with 3.42s??

At least ill be able to launch lol

White6SpdZ28

iTrader: (6)

I did the same thing last winter. Have never dynoed it but LOVE my 9in and the ability to launch and not worry about breaking the rear

S10xGN

iTrader: (11)

Unless you're pushing 1500 to the wheels, I don't think you'll lose that much...

MikeWS6

No 414/387 lol

pillarpod

there was a thread about this in the LT1/Lt4 forum long ago. Can't find it but supposedly there was a loss of 5whp-10whp

MikeWS6

Nice, I thought w/ heavier rear / lower gears would kill my power.

wrp

At your power level there are a lot of options, look through them carefully. I am on my second differential now, just installed a Strange S-Trac

Blackpanther99

iTrader: (8)

Youll love your 9". It just means youll be able to push more power without worrying about breaking your rear end

What spline are you deciding on?

Will it be a Wavetrack?

MikeWS6

Still researching / dug up some old threads.

Maybe its not as much as I thought

https://ls1tech.com/forums/gears-axl...in-losses.html

wrp

I'd acknowledge a loss from the OEM Dana in my GTO to the 9 inch Ford. But I'd also have to acknowledge my ET going from 7.81 in the 1/8 mile to 7.3 and the latter was on a 60% throttle pass. Whatever the toy you are measuring rwhp with says, it isn't really a loss if you have set everything up right. Just my opinion.

MikeWS6

So it will be faster even though the 9 is way heavier the 410s will make up for it ??

wrp

Depends on the driver You tag that much weight on a stock car you are probably going to be able to launch it harder, but can you? I lost 20-30 rwhp and picked up speed. Can't judge your situation