To those with 4.56 or 4.10 gears
#12
#16
If you didnt then your speedo/mileage is reading high by about 12%
#18
#19
I have 4.11's in my pickup and if I keep my foot out of it on economy highway I averaged 17.4mpg then city I avg. 13-14 depending. Going 70 on the freeway I sit at 2160rpms. I didn't change any gearing in the trans and my speedometer is 100% accurate. Tested it against my GPS in my phone in a straight away with cruise set at exactly 70 and the GPS reported the same speed. Are you talking about the pinion?! Still is a gas hog though. Speaking of mileage, I need to replace my O2 sensors. What do you use in your truck? I'm stumped on what brand to get. I have 2 O2's pre cat and after cat.
Last edited by terranova; 08-04-2010 at 07:06 PM.
#20
I have 4.11's in my pickup and if I keep my foot out of it on economy highway I averaged 17.4mpg then city I avg. 13-14 depending. Going 70 on the freeway I sit at 2160rpms. I didn't change any gearing in the trans and my speedometer is 100% accurate. Tested it against my GPS in my phone in a straight away with cruise set at exactly 70 and the GPS reported the same speed. Are you talking about the pinion?! Still is a gas hog though. Speaking of mileage, I need to replace my O2 sensors. What do you use in your truck? I'm stumped on what brand to get. I have 2 O2's pre cat and after cat.
98 gets speedo signal off a tone ring in the diff
Prior to 98 it gets it from the trans speedo gears in the tailshaft(pic below of mine).
I have 3 o2s for my 96 also (stk is 2) The rear o2 is a Bosch n/b, my front o2s are both widebands, ones a Bosch & ones a FAST
Last edited by RM_Indy; 08-04-2010 at 07:52 PM.