I'm thinking of going to 4:10 from 3:55. My question is about LS. I have LS from the factory, can I get just a new ring and pinon, or do I need a whole dif?



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2000 F150 XLT 4x4 Extended Cab

Deep Wedgewood Blue, 4.6L Manual Trans, Ford Tonneau Cover, Magnum Bug Deflector, Panther 16x8 wheels with 285/75 R16 BFG All Terrain T/A , 'Superchips' Performance Chip, K&N FIPK, Westin Side Bars (Black), 3" Jardine Cat-Back Exhaust with Stainless Tip, Clear Corners, Tinted Font Side Windows

 

Just the gears on the 9.75" but I am not sure about the 8.8". On my old 10.25", you had to change the LS if you went to 4.10 or above.

Ian

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99 Expedition EB
5.4l, 4x4, 4.10 LS
WMS Tube, Bassani Cat Back Exhaust, Superchip Flipchip

 

sigalph,

You keep the existing carrier and the LS. The gears and shims ect.. are all that is replaced.

Regards

Jean Marc Chartier

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00 F-150 XLT SC Flairside 4x4 4.6 w/5spd 3.55LSD
Warn XD9000i, skid plates, Draw tite class III,
Rancho RSX Reflex shocks, MAC 8.8 Axle Girdle
BFG 285/75 R16 MTs,
Borla Cat Back, Hedman Headers,
Custom air intake system with modified
air box, Ported Throttle body,
Shortened MAF sensor tower,
K&N air filter,
Superchips

 

Thanks JMC and Ian

Knowing this, how much should I expect to pay?

 

$150 for the gears and install kit. $200 to $500 for someone to install it.

 

More like $1,100-$1,300 on a 4X4.

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2000 F-150 XL, RC, LB, 5.4L, 4R70W, 3.55LS,
Class III tow, Payload #3, & Convenience pkgs.,
4-wheel disc/ABS, Chestnut/Parchment 40/60,
Ford bedliner w/Paintsaver & gas/wheel/spare locks,
K&N F.I.P.K. w/Outwears pre-filter, Superchip,
Dynomax ultra-flow welded 3" cat-back w/ 3" Y-pipe,
Hellwig front & rear anti-sway bars, Rancho RS 9000s,
Mobil 1, K&N oil filter.

 

Does anyone have 4:10's and the 5 speed? If so how is it to drive?

Regards

Sean

[This message has been edited by sigalph (edited 05-09-2001).]

 

Update:

I did some math and

285/75/16 = 32.8"
265/70/17 = 31.6"

3:55 31.6 @ 60mph = 1812 rpm
4:10 31.6 @ 60mph = 1746 rpm

3:55 32.8 @ 60mph = 1746 rpm
4:10 32.8 @ 60mph = 2016 rpm

So the diffrence from stock 1812 rpm to 4:10 with 285's (2016 rpm ) is 11.26%

This means at when my speedo reads 60 mph i will be doing 53.24 mph


If my math is not correct please let me know, I know you will

 

It will hurt my head too much to try and figure out how you did that but i know that when you calculated this: 3:55 31.6 @ 60mph = 1812 rpm & 4:10 31.6 @ 60mph = 1746 rpm one of the 2 is wrong. The 4.10 would have a HIGHER RPM than the 3.55.

Brian

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98 F150 XLT Supercab 4X4
4.6L V8 3.55LS
Tonno Cover, Brush Guard, Dukes of Hazzard Dixie Horn, 2 150 watt KC Daylighters, Cobra CB Radio, BF Goodrich All Terrains 265/75/16
http://hometown.aol.com/barto24/brianstruck.html
--------------------------
2000 Excursion Limited 4X4, Black, V-10, 3.73 LS, Tow Mirrors

 

Your right, I screwed up,

it should be

285/75/16 = 32.8"
265/70/17 = 31.6"

3:55 31.6 @ 60mph = 1812 rpm
4:10 31.6 @ 60mph = 2093 rpm

3:55 32.8 @ 60mph = 1746 rpm
4:10 32.8 @ 60mph = 2016 rpm



[This message has been edited by sigalph (edited 05-10-2001).]