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Thread: 4.8 don't feel right
09-09-2013, 08:12 PM #11
- Join Date
- Mar 2007
- Grand Prairie, Texas
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How does the transmission feel?
Is it shifting soft?
Does it feel like it might be slipping between shifts?
Or is it real hard hitting?
The gearing your running, 3.42, with the tire size, 285, would tax any engine/transmission combo.
Even if it were tuned to run that size tire the tune wouldnt make up for the tire size/gearing power deficit and added wear on the transmission.
With that combo of gears and tires I wouldnt be surprised to see very high and destructive transmission temps.
A failing clutch pack or torque convertor wouldnt show codes either.
Check the tran fluid color, lubricity, and smell. I wouldnt be surprised to see issues in the trans.
Trans issues with vehicles running larger tires having trans problems are begining to become a big issue, the biggest issue is many of the vehicles are at or approaching the end of their warranties and in many cases the larger tires were added by the ownet so it voids warranty coverage. Trucks with 20" wheels and 285 tires normally have deeper gears.
09-09-2013, 11:43 PM #12
no noticeable oil consumption, how to go about checking out the cats? never did it before and we have no emissions testing. the tranny shifts normal, fluid seems ok , dosent look burnt or smell like it. but maybe a flush, fresh filter and synthetic oil may help it out?2010 silverado WT, 4.8lt,3.42's,came with nothing, goodies include, 33" pro comp tires,ready-lift level kit, MBRP Exhaust,bull-bar with 6inch hella 500's and dezee step bars.upgraded to white bumper corners with fogs,chrome grill,mirrors and doorhandles and a color matched A.R.E roof level Cap.
09-12-2013, 09:48 AM #13
go for a test drive and see if power improves. if so then you know the exhaust is restricted.