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-   -   4:56 gears and Detroit Trutrac installed! (

Ragemoto 09-19-2013 08:30 PM

4:56 gears and Detroit Trutrac installed!

So i just got my truck back the other day from Gearworks in Clearwater FL. I had them install 4:56 gears and a Trutrac LSD. I am just finishing up the breakin cycle. I have been running 325/65/18 Terra Grapplers but just put a new set of 35/12.5/18 Cooper STT's

The traction and acceleration is mind blowing, however, my city milage is reading 10-11.5 significanly lower from wheni had the crap 3:21's

My GPS is reading speed just about spot on and I cna't get a solid answer if I need to get the computer flased to relfect the gearing change to correct shift points.

The dealer quoted 69.00 for the gear adjustment and 69 for the tire size correction that I never bothered with. Please advise...

hydrex 09-19-2013 10:02 PM

Might need some wheelie bars, hehe. If you get a Diablo tuner, you can reset the speedo, and I suspect your mileage will look a lot better.

TheSatinPumpkin 09-21-2013 06:57 PM

no adjustment needed for regear. dealership can do tire size.change adjustment for mph correction or purchase do it yourself with handheld programmer.

neuman22 10-17-2013 12:08 PM

So I'm thinking about upgrading to 4.10's or 4.56's as well to get some power back after installing my lift and was wondering if the computer needed to be updated after installing the new gears. I talked to 4 wheel parts and they said I'd have get a new tune, but I really don't want to for fear of voiding the lifetime warranty. Does anyone know if the dealership will update the computer after 4 wheel parts installs the gears without voiding the warranty on the rest of the engine/drivetrain? I don't care if I lose the warranty on the diffs especially if I go with a 4.56 because those would be pretty much bulletproof. I just don't wanna void my warranty on the engine/tranny/transfer case etc cause I'm planning on driving this bad boy for a long time.

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