Differential question

[alexzckary]

Hey I have a 96 International 3800 with a DT 466 Mechanical (190 HP), It has a spicer 6+1 tranny with a Dana N175 rear end with a 4.78 rear end, I want to change the gearing to 4.10, I found a 01 Dana N175 out of a 4700 and was wondering if that would / could work or if they made any major changes to those after 96 that would cause it not to work. Thanks!!!

Heres the link to the diff I am looking at: Thompson Motors - Used Trucks, Motors, Transmissions, Truck Parts

[magnakansas]

you identified both axles being a dana n175, same axle housing should mean same differential. Look up the part number for the rear u joint on both trucks, and verify that the same part number is used, that should be a dirty double check that these are both going to mount the same.

I did the same for my bus, My rear axle housing is a dana/spicer s110 I looked at truck salvage rear gears for dana/spicer s110 until I found the ratio I was looking for.

You have done the same.

It is a big center section. Going to be heavy. Mine is big enough that I cannot pick up the center section. Jacks and lifts all the way.

william

[magnakansas]

There are also 3.91 gears available too. They all look to be the same across the years you have quoted.

cheers, william

[alexzckary]

Awesome, thanks for the help, do you think I should go with 3.91 instead? I will be pulling a 7X16 with a v nose trailer behind it loaded with a couple thousand lbs so I thought the 4.10 would maybe be a better fit

[magnakansas]

I think there are at least two, one with a 1.00 drive in 7th and one that is over drive in 7th.

which one do you have?

I have geared my bus so that at 65 mph I am turning about 1875 rpm in overdrive 6th. and in 5th 2525 rpm and that is a 1:1 ratio.

I worked with my intended cruise speed and engine rpm then worked backwards to find what i wanted for a gear ratio. I think I will be good on torque at 6th on level ground, and can multiply a little more when in 5th and maintain speed up hills.

You have a larger bus and larger engine. I have a lil ol itty bitty thing.

william

[o1marc]

If you go with the higher 3.91 and you're towing a load it will be slow as molasses going up hill in Jan. coming out of the hole.

[alexzckary]

My 6th gear is direct 1:1 and thats why I think the 4.10 gears might be a better fit due to the weight