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Re: Transmission suggestions.
+1 on the 4l60 set up. My 2005 crew cab 2x has a 5.3, 4l60e and 4:10's great puller and 20 mpg on 22's.
My 50 burb has inline 250, 700r4 and 3:73's gets 20 mpgs with 29" tires at 60 mph but when hooked to my 20 ft 4k lb trailer it could use the 4:10's.
My wife's 2008 Tahoe has a 5.3, 4l60e and 3:73's and gets 18mpg on 20's. It's a 4x4 but lowered 2 inches, pulls the same trailer great.
Just giving you some examples
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