Gear upgraded, 3.08 to 4.10
I just upgraded the gear in my Suburban from 3.08 to 4.10! Still need to go to a speedo shop to get the speedometer calibrated. First drive today, it's feels quite a bit more responsive though it's...
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TurnThePage wrote:RCMAN46 wrote:I believe it was the 4R70...TurnThePage wrote:
I took my old F150 4.6L from 3.55 to 4.10. It made a HUGE difference. Unloaded highway mileage took a 1 mpg hit, but city driving and towing both had improved mileage. Not only that, I could suddenly maintain speeds towing in the mountains, and not have to worry about the truck grinding to a halt on long, steep climbs, which nearly did happen previously. It could suddenly cruise on the highway without dropping out of overdrive because a slight headwind or incline. The truck was so much more enjoyable to drive too. In short, it's the best mod I ever did to that truck, and I did a lot of them.
What transmission did the old Ford have?
My original comment to the OP changing from a 3.08 to a 4.1 gear may make very little difference because of the gear spread in the GM 6 speed transmission.
If you compare the overall ratios you will find the ratios with the 3.08 are very close to the 4.1 if you compare ratios with the 3.08 down one gear in each case.
Thus after first gear there is very little change as you go up in gears until 6 th gear which is rarely used when towing with the 3.08.
With your change of gears and the Ford 4 speed that is not the case.
