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Unread 05-23-2012, 02:34 PM   #1
Jeremywrags
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2011
Location: Chino, Ca
Posts: 93
Going from 3.73 to 4.56

Hi All,

I am going from 32's to 35" tires and will probably need to reagear on my 200 TJ 4.0 3spd Auto.

I currently have a D30 with a spartan locker and 3.73 in the front and a Dana 44 with the limited slip 3.73 in the rear.

Can anyone tell me exactly what I will need to get to go to 4.56 gears. I will probably have a shop do the work but I am looking to be educated here so that I know exactly what I am getting into.

I have read things like carrier break and Thick gears but it's all a mystery to me... Will I need a new locker or will mine work, do I need a carrier or thick gears...

Also is 4.56 the right choice for my setup and what would be the consequenses of just sticking with my 3.73's???

Thanks in advance

__________________
2000 Wrangler Sport 4.0L Auto, SYE, D44 3.73, 4.5" Lift, 15X10 MT Classic Lock, 35x12.50 Cooper Discoverer STT, Rampage Frame less top
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Unread 05-23-2012, 04:13 PM   #2
Jason
Registered User
2005 TJ Wrangler 
 
Join Date: May 2009
Location: Eaton Rapids, Michigan
Posts: 6,319
I believe the Spartan locker is a lunchbox locker and will work in either Dana carrier, but your 3.73 carrier will take 4.56 gears anyways, so it doesn't matter.

Your rear needs a 3.92+ carrier, or you can use thick cut gears and your current 3.73 and down carrier. The thick cut gears make up the difference between the 3 and 4 series carriers.

I feel that 4.56s would be a good choice. It would put you at almost 3000 RPM at 65 MPH. I run about 2800 RPM at 70 MPH. 3.73s isn't enough gear for the 35s; it would drop you out of the power band.
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