Another MPG Thread
Junior User
Joined: May 2012
Posts: 57
Likes: 0
Tugly, that mileage is excellent. I've read the link in your sig and I'm slowly creeping up, 15 highway after replacing ebps with faulty readings. Anyway I've noticed in your pic, speedo at 65 your around 1900 rpm. I'm at 2100 @ 65 with 4.11 gear. I'm guessing you have a taller gear attributing to better mileage?
Junior User
Joined: Aug 2012
Posts: 53
Likes: 0
From: Middle Tn
NOT 
but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
Elder User
Joined: Jul 2012
Posts: 947
Likes: 0
From: Glen Rose, Texas
NOT to but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
NOT but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
but is there a way to tell the gears in the rear per say? I thought I read it how to tell but due to short term memory loss I forgot. I am running much less at 65 but have huge tires which does change ratio. I do know that my speedo is 3-4 MPH slow to the real time gps.
Mountain Pass
Joined: Nov 2010
Posts: 168
Likes: 8
From: Princeton Minnesota
Rear tag should have 3L73 meaning 3.73 ratio with limited slip. If no LS I believe there is only a space. If there is no tag on the rear, the calculator will get you close enough, otherwise, the tag was removed and you really wont know except to open it up.
With my 37" and 3.73 gear I am running 1750RPM at 68MPH per the GPS, 65 per calculation.
Here's a link to the calculator: Interactive RPM and MPH Computator Program
The effective gear ration for our 4R100 in OD is 0.80.
With my 37" and 3.73 gear I am running 1750RPM at 68MPH per the GPS, 65 per calculation.
Here's a link to the calculator: Interactive RPM and MPH Computator Program
The effective gear ration for our 4R100 in OD is 0.80.
Last edited by Gatrucknut; Aug 23, 2012 at 10:48 AM. Reason: No tag.
Junior User
Joined: Aug 2012
Posts: 53
Likes: 0
From: Middle Tn
I know on the door tag under Axle it has nothing. I will check on rear axle today. I think I found the tag just to the right of the pumpkin from the rear of truck but someone painted over it.
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Mountain Pass
Joined: Nov 2010
Posts: 168
Likes: 8
From: Princeton Minnesota
Sorry , I havent quite figured out how to insert a pic.
Junior User
Joined: Aug 2012
Posts: 53
Likes: 0
From: Middle Tn
This truck has aftermarket covers by Mag-something. Rear Diff, trans and the oil pan. Nice items and the rear has a dipstick but no dog tag to be seen. Same here, I need to learn how to insert pics as well.
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