rear end question.

s14.5gonewide · 10-12-2009, 06:31 PM

hear is my newbish domesic question of the day... ill put my flame suit on..

i have been on ls1performance and ls1tech and myls1 lookat upgrqades for a fbody ws6(yes i am still wanting one)

i read that when swapping from the stock 10bolt to a ford 9inch or dana60 you loose power. is this really true.?

what would be a better option as far as power to the ground/reliability.?

ive herd that the ford9inch is like a power taker... reliable as all get out and will take all you can throw at it. or is this in referance to upgraded with axels center section ect ect.. oh i was looking at 4:10 gears as well.

again this is just looking.. call it bench racing or building on paper. im just trying to do my home work so if/when i get one i can have a plan of attack as to what i want..

LXtasy · 10-12-2009, 07:13 PM

a 9 inch will rob some power away compared to a stock 10 bolt or 12 bolt.

Just like you loose power through an auto compared to a manual.

Also on a dyno, you can lose power with a higher stall converter than a stocker. That is what I have seen , not experienced. But at the track you pick up.

BAD BOB · 10-12-2009, 07:28 PM

some go with a 12 bolt just bc they can be stron enought to a certain level and they weigh less. it would prolly be cheaper to go 12 also

s14.5gonewide · 10-12-2009, 07:29 PM

thx man.. i was not really sure i just read it.. i am well aware of drive train loss and diffrent dyno readings. i was just not sure how valid the statment was.. i cant see it loosing to much whp thru a ford 9 inch as compared to the stocker. nothing you will fee.

for referance ur but dyno osnt really feel anything till u have made 10% more power.

1iron · 10-12-2009, 08:21 PM

8.8 is great.

1998ta__1991rs · 10-12-2009, 08:43 PM

the 12 bolt has problems in fbodys due to cracking the torque arm mount on the housing with higher powered cars, the 9" mount is a lot stronger, the 12 bolt is great and holds a lot of power, but it just wont hold up in higher hp late model fbodys like it did in the older cars.

1998ta__1991rs · 10-12-2009, 08:44 PM

Quote:

Originally Posted by 1iron

8.8 is great.

same problems as 12 bolt when in fbodys

gearmesh, inc. · 10-12-2009, 09:05 PM

The Ford 9" takes a little more horsepower to turn due to its lower pinion centerline than other rearends. With the pinion centerline being lower, this design decision makes for a longer tooth contact pattern between the pinion teeth and the ring gear teeth. Durability comes from less lbs/sq. in. load on the teeth. The negligible horsepower loss is due to the extra operating friction of this increased tooth contact area.

Simply give and take. Damned if you do, damned if you don't. Decisions, decisions!

s14.5gonewide · 10-12-2009, 09:33 PM

thx everyone.. i dont think the friction loss of power will amount to anything the 4.10 gears will equal out in gearing.

im sure ill be asking more domestic stuff as i get a handle on the ls/fbody... wow my newbish feelings are so epik..

Matts94Z28 · 10-12-2009, 10:17 PM

Midwest fab 9!!

10-12-2009, 06:31 PM	#1
s14.5gonewide Senior Member Join Date: Sep 2009 Location: north charleston Posts: 1,657	rear end question. hear is my newbish domesic question of the day... ill put my flame suit on.. i have been on ls1performance and ls1tech and myls1 lookat upgrqades for a fbody ws6(yes i am still wanting one) i read that when swapping from the stock 10bolt to a ford 9inch or dana60 you loose power. is this really true.? what would be a better option as far as power to the ground/reliability.? ive herd that the ford9inch is like a power taker... reliable as all get out and will take all you can throw at it. or is this in referance to upgraded with axels center section ect ect.. oh i was looking at 4:10 gears as well. again this is just looking.. call it bench racing or building on paper. im just trying to do my home work so if/when i get one i can have a plan of attack as to what i want.. __________________

10-12-2009, 07:13 PM	#2
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	a 9 inch will rob some power away compared to a stock 10 bolt or 12 bolt. Just like you loose power through an auto compared to a manual. Also on a dyno, you can lose power with a higher stall converter than a stocker. That is what I have seen , not experienced. But at the track you pick up. __________________

10-12-2009, 07:28 PM	#3
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	some go with a 12 bolt just bc they can be stron enought to a certain level and they weigh less. it would prolly be cheaper to go 12 also __________________ IM BAD BOB

10-12-2009, 07:29 PM	#4
s14.5gonewide Senior Member Join Date: Sep 2009 Location: north charleston Posts: 1,657	thx man.. i was not really sure i just read it.. i am well aware of drive train loss and diffrent dyno readings. i was just not sure how valid the statment was.. i cant see it loosing to much whp thru a ford 9 inch as compared to the stocker. nothing you will fee. for referance ur but dyno osnt really feel anything till u have made 10% more power. __________________

10-12-2009, 08:43 PM	#6
1998ta__1991rs Senior Member Join Date: Jun 2008 Location: West Ash Posts: 4,283	the 12 bolt has problems in fbodys due to cracking the torque arm mount on the housing with higher powered cars, the 9" mount is a lot stronger, the 12 bolt is great and holds a lot of power, but it just wont hold up in higher hp late model fbodys like it did in the older cars. __________________ Funny

10-12-2009, 08:21 PM	#5
1iron Senior Member Join Date: May 2007 Posts: 2,014	8.8 is great.

10-12-2009, 09:05 PM	#8
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	The Ford 9" takes a little more horsepower to turn due to its lower pinion centerline than other rearends. With the pinion centerline being lower, this design decision makes for a longer tooth contact pattern between the pinion teeth and the ring gear teeth. Durability comes from less lbs/sq. in. load on the teeth. The negligible horsepower loss is due to the extra operating friction of this increased tooth contact area. Simply give and take. Damned if you do, damned if you don't. Decisions, decisions! __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.

10-12-2009, 09:33 PM	#9
s14.5gonewide Senior Member Join Date: Sep 2009 Location: north charleston Posts: 1,657	thx everyone.. i dont think the friction loss of power will amount to anything the 4.10 gears will equal out in gearing. im sure ill be asking more domestic stuff as i get a handle on the ls/fbody... wow my newbish feelings are so epik.. __________________

10-12-2009, 10:17 PM	#10
Matts94Z28 Senior Member Join Date: Apr 2008 Location: Summerville Posts: 12,039	Midwest fab 9!! __________________ Charleston Performance Solutions 4560 Rivers Ave. N. Charleston SC 29405 843-225-1142 https://www.facebook.com/CharlestonPerformanceSolutions www.facebook.com/Selepack