Loss of power with bigger wheels... Can anyone help??

[caltmann]

I have 20in rockstars with 305/55R20 Nitto All Terrains. Its the 4.8L and since they have been on there, its really sluggish in the high gear. Have to mash it slighty to get it to get going. Im trying to see if i can get a ring and pinion to help this out. Im not sure what the stock set is and which gear to pick. Can anyone help??

 

[ezdaar]

4.10's and a 2800rpm converter will help a ton..

 

[caltmann]

How much work is it to change the converter?

 

[brucebruce45]

I'd do 4.56s with that 4.8. Tahoes are heavy and undergeared as it is

 

[M3PO]

How much work is it to change the converter?

That is a matter of opinion, either way the transmission will have to be removed to swap out a torque converter.

 

[blueflamed03]

yup, gears and converter...a stall would be after the gears, IMHO..

 

[slocaddy]

look in your glove box to find your gear code, i'm sure some body here know what they all are. I think you will find you have 3.42's from what you describe, or they may be 3.73's. def go lower than 4.10. (imo)