Best gear ratio for lq4 or lq9 w/ 4l65e
 

What will be the best gear ratio for a 6.0 ls swap with a 4l65e in a 67 c10.
The truck will be use both for city and occasionally highway use.

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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

I'm by no means an expert but it will depend on specific factors on your vehicle. main thing your missing is your tire size. . This calculator might help you.
http://www.angelfire.com/fl/procrastination/rear.html

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

Tire height plays a huge role in rpm. I have a 27" tire and 3:42 in my suburban It needs more rpm for performance and towing. Cruise on freeway it's great.

Same goes for my work truck it has 32" tire and 3:73. It needs at least a 4:11 to work the way I wish it would. Even a 4:56 wouldn't be out of the question.

Play with the rpm calculator and decide what you want most out of the truck. Hwy cruiser or performance hauler. Remember the Denali trucks came with 4:11 and 32" tire and they are quick.

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

I won't run anything bigger than a 29" tall tire. I don't see myself hauling anything with this truck. It will be bagged and on a PB Extreme drop member

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

3.73

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

My LQ4 has the 4 l80e behind it along with 4:10 gears. Highway is 16-18 MPG and the stop light to stop light is fun also.:lol:

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

My truck is bagged too :)

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

72mario,cool setup!

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

That's sweet! Bag the camper as well :metal:

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

why did you decide to go with the 4l80e?

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

Because I bought the whole setup out of a 04 heavy duty with 70,000 miles on it.:chevy:

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

What Jocko said.

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

What size tires?

My '55.2 has same LQ4/4l85e combo but 3.73 final rationand 235/55x17 tires so I wonder how it'll do for mpg and mileage as well?

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

My trucks info is all right here. When I took it to the tunner and put it on the DYNO machine he said the 4L80E takes a lot of HP to operate. My HP # was @290. All stock except for header's. :chevy:

http://67-72chevytrucks.com/gallery/..._the_truck.jpg

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

What brake setup are you running?

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

I have 3.73s in both of mine ,one with overdrive 200-4r , and one without turbo 350 , both work great with 29 inch tires

Re: Best gear ratio for lq4 or lq9 w/ 4l65e
 

3.73