Compression Ignition Addict
Join Date: Oct 2010
Location: Nunn, Colorado
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The 4:10 gears if anything will make the truck faster than the same truck with 3:55s or 3:73s because its lower gearing if that makes sense.
As a result of this lower gearing, rpms are going to be higher than a truck with the 3.73s or 3.55s, at 65 my truck is turning 2100 rpm, compared to my moms 3.73 truck that does 1850 at 65. this will result in lower mileage, but increased acceleration accross the board. youll also feel the difference from a truck with higher gearing when towing.
Now the truck most likely came from the factory with 4:10 gearing, this was a popular option in obs trucks. im not sure how much regearing the truck with higher gearing such as 3:55s or 3:73s would cost, but honestly unless you mainly commute in the truck id leave the 4:10s in.
as for the tranny shifting slow, i couldnt tell you much about that, sounds like it may be slipping. im sure other members will chime in, hopefully a little bit of what i just told you is correct...
1997 F-250 Long Bed Extended Cab
--7.3 Powerstroke E40D Auto
--4.10 Rear End
-Napa 6637 DIY CAI
-3 inch DP, 5 inch under truck, 6 inch Mitre!!
-2nd gen Wicked Wheel from Dieselsite
-Tony Wildman 6 Position Chip
Broke College Kid Mod
Now residing in LARAMIE, WY for school at the University of Wyoming! Hit me up if youre around, I'm always down for a hot rodding adventure
"Never cut what you can untie"