MPG for a 2500 Suburban?
With another baby on the way I'm thinking of upgrading our family sedan to a Suburban. I want to be able to use it for towing so I'm going to go for a 2500 model. I know mileage towing will be single ...
Forum Discussion
Believable and am in the hunt for the finishing details for the rebuild of my 1996 K3500 Suburban from a 4.1 diff ratio to something in the 4.88 range. Plus a GearVendors OD that will turn my 4 speed into an 8 speed
My 96 K3500 7.4L gets 10 MPG just about all the time. Pure freeway get 12.x MPG and occasionally get 15.x MPG often enough to claim it. Towing heavy is around 7-8 MPG dependent on terrain and my computer controlled right foot...
With the current 4.1's final ratio is 3.08 in OD at the axle. First is 10.17 at the axle.
With the 4.88's and with a GearVendors final ratio is 2.85 in double OD at the axle. OD & double OD are not for towing, but cruising. First will be 12.1 at the axle.
Double OD will have the big block cruising 65MPH at about 1,400-1,800 RPMs, at which my big block is at 100% torque capabilities. Haven't spent the time to do the detailed cal's yet...just than range as my guess (still noodling which tire size)
GearVendors 4L80E 4-SPEED AUTOMATIC OVERDRIVE chart
Waiting for that 'gosh darn....gotta rebuild the 7.4'....
PS...I've blocked that BS'er and is what that function is for...removing commentators who I just don't wish to read/hear from...
PPS...I keep my vehicles a long time and am happy with what I have...do NOT like spending what a replacement would cost (highest optioned Suburban at it's time and today that is in the $90K range) and the there are no +8.6K GVWR Subs...nor are the vans to my liking at this time)
My 96 K3500 7.4L gets 10 MPG just about all the time. Pure freeway get 12.x MPG and occasionally get 15.x MPG often enough to claim it. Towing heavy is around 7-8 MPG dependent on terrain and my computer controlled right foot...
With the current 4.1's final ratio is 3.08 in OD at the axle. First is 10.17 at the axle.
With the 4.88's and with a GearVendors final ratio is 2.85 in double OD at the axle. OD & double OD are not for towing, but cruising. First will be 12.1 at the axle.
Double OD will have the big block cruising 65MPH at about 1,400-1,800 RPMs, at which my big block is at 100% torque capabilities. Haven't spent the time to do the detailed cal's yet...just than range as my guess (still noodling which tire size)
GearVendors 4L80E 4-SPEED AUTOMATIC OVERDRIVE chart
Waiting for that 'gosh darn....gotta rebuild the 7.4'....
PS...I've blocked that BS'er and is what that function is for...removing commentators who I just don't wish to read/hear from...
PPS...I keep my vehicles a long time and am happy with what I have...do NOT like spending what a replacement would cost (highest optioned Suburban at it's time and today that is in the $90K range) and the there are no +8.6K GVWR Subs...nor are the vans to my liking at this time)
