r_stramel

My 08 unlimited x 6speed is going in the shop on Monday for 5:13s. I haven't bought tires yet so this thread is of great interest to me as it can help me decide 35 or 37. Mine is a daily driver mostly in town but when I do go highway its usually for long 300 plus mile trips. Keep the info and setups coming guys I appreciate it!!

Bingbola

What do u mean by if u ever want to use top gears

Torrin

He is talking out his butt, he has an auto and has no idea what a manual transmission feels like with 4.88's. I drove up a significant hill (Middle TN style) in 6th going 75MPH and lost 1 MPH in a 1/2 mile. For me, 4.88's and 35's are great and have even had days of "I wish I would have gone 4.56".

Torrin

Again, on a 6 speed with a D30, I recommend 4.88's, but since you have the 5.13's being installed, I sure would make sure you beef up the D30 before you put on anything. I would not put 35's or 37's without at least gusseting your C's. I have gussets and a custom truss.

If you put 35's on the 5.13's you are going to be reving pretty high in 6th at 70MPH. I am at 2800.

Bingbola

Is that because u r reving to high due to being geared to low?

Torrin

Yup, I rev ~2800 at 70, so I have nice power, but I am down to 14MPG. Partially that is because the Mickey Thompson's are a pretty short 35, and partially because 4.88 is a low gear ratio for 35's.

Bonedoc

Anybody running 37's and 4.88 want to chime in on how it is?

Thanks

Bonedoc

Thanks for the input, to me...it would seem that 5.13 will have me cranking a much higher RPM at cruising speeds than 4.88. I know it is only a quarter driveshaft turn more...but it makes a difference. I know that 5.13 would be the absolute best for offroad and rockcrawling but given how much og that I do, 4.88's are probaly better for a daily driver. Also I'm seeing alot of people saying that 5.13 will bring back stock performance, looking at the chaert maybe in a rubicon with stock 4.10's. I have 3.73 and at 70 I'm only turning 2300 RPM. So to jump to 2700+RPM with 5.13 and 37's it will feel like it is screaming. As well as I'm sure the gas mileage will suffer more.

Bonedoc

bump up to front, need opinions