ok guys i know ya'll are probably sick and tired of all my posts, but here it goes. will the 4:10 gears mess my interstate travel up? i like to travel between 80 and 85 on the 'state and i don't want my engine to be screaming for me to slow down.

 

Now this would be a question for Tom because he's the only one with 4:10's.

Tom?

 

Thank you for that warm introduction Joe

jbo,

My automatic transmission with 29.5 inch diameter tires produces aprox 2800 rpms at 85 mph, very smoothly too.

I have had my truck up to over 100 mph before I begin to feel a slight drive train vibration, due to the fact that everything is spinning so fast.

However, my journey was not an easy one. My automatic transmission super cab has a abnormally long aluminum drive shaft. After I had the 4.10's and locking diff installed, I developed a harmonic drive shaft vibration at 85 mph. In order for me to rectify the problem I had to invest in a 5" high performance aluminum drive shaft, which fixed the problem.

Now, if you don't have a supercab, then you have nothing to worry about. If you do have a supercab, you still may not have a problem, but if you do have a supercab, just be prepared to experience this vibration and be ready to have the larger diameter drive shaft installed.

I'm not sure if the gears have given me worse gas mileage on the highway, however I do know that it has given me better gas mileage in the city, because my engine does not have to strain as hard to jolt from light to light.

If you drive excessively on the highway for long distances at 85 mph, then I would suggest the 3.73 gears instead of the 4.10's, unless your going to install larger diameter tires.

I sometimes drive a few hours on the highway doing between 70 and 90 and don't feel like my engine is strugling at all. But I Don't usually drive a steady 85 though. I usually drive an average of 75.

My advice is if your not racing your truck and your going to keep your stock tire size and you do a lot of high speed long distance highway driving, go with the 3.73 and not the 4.10's.

Personally though, I wouldn't trade my 4.10's in for the world. In the city, I now only have to touch my pinky toe on the gas pedal and I'm already at the next light. Before I installed the 4.10's, I felt like my truck was choking from light to light. I had to put my foot to the floor just to get the thing to move.

Tom

 

4.10? Go big with 4.56's and put on 14" mazda rims That would be sweeet! LMAO

Garrett

 

Ha ha, could you imagine???

funny though, I've seen truck with those little wheels on them sticking so far out the side of the truck that the axles looked like they were bending and the wheels looked like they were going to pop off...ha ha ha,, funny.

Tom

 

Just imagine shooting up 0-60 in a V10 with 4.56 gears and 14" rims, 225 tires....whatever is stock on like a honda prelude or something! LMAO

Garrett

 

thanks for the input tom. the driveshaft element didn't even cross my mind. doh! after hearing that i will probably go with the 3:73 gears. If anybody's got those let me hear what you think of them.....thanks

4:56 with 14 inchers now that's funny !

 

Yeah Garrett, if it would even do 60

I think the 3.73's are perfect for what your looking for. A well balanced diet between an increase in performance and highspeed long distance highway driving.

You didn't mention whether you had an automatic supercab or not, do you?

 

yeah, i've got a supercab with an automatic. i'm pretty sure your right-the 3.73's would be perfect for my application.

 

Unless you want to take the risk of replacing your driveshaft, which is not easy to find someone to fabricate it for you, your better off with the 3.73's. I geared mine for the quarter mile so mileage and highway driving weren't my main concern.

Tom