Ok here goes looking for an education....1993 D350 dually 5spd getrag 4.10 gears.....This is a great truck with 71000 miles and I want to change the gears to match my my 91(3.07) or my 92(3.54) so it will go faster at lower rpm. This truck is the puller 8000 to 21000 loads on trailer to Arkansas. I am used to the M11 running down the road at 80000 turning 1500 give me your thoughts Thanks

 

Well 4.10's are better for getting the load started. Also with the 3.54's it would be easier to LUG the tranny and the rag does not like to see the low rpm torque these trucks see. I would not pull heavy at 1500 rpm's. It will rattle the tranny apart. I know what you mean about those low rpm's in a big rig. Those trannys can take that. My 310 horse 3406 will pull its heart out at 1300 rpm's. ( well as much as a 310 has anyway )

 

Love my 3.73 gears. The best of both worlds for me anyway.
Not to low for running down the interstate empty, and not to high to pull through the mountains when I have too run a load out of state.

 

Monaco73 the 4:10s are great for pulling. Yea the road speed is not great but alot less shifting. Like Richie O said the Getrag doesn't like the lugging, it can shake it apart. The little 5.9 isn't the M-11 by any means, and the Getrag is a long ways off from the Roadranger you possibly have. My 93 w/Getrag and 3:54s ain't happy at 20/22,000 lbs. going up grades and we don't have much of grades here. Other than road speed I think the 4:10s are your best deal. Good luck!

 

If it's road speed you're after you could drop in a $20 366 gov. spriing and keep the 4.10s for those heavy loads. I don't know what the terrain looks like where you are but if there are any hills you'll want the lower gear when you get to 20K lbs.

 

Unloaded the 3.07's are lots of fun, great top end speed, good milage, low rpms, etc. But I agree with every one else so far, if you are towing heavy keep the 4.11's, I am soon replaceing both housings in my truck so I can run the lower gears. Grossing 12000 to 18000 here in Pennsylvania is almost miserable with the 3.07's, I don't know how your roads are out there but around here most roads are not much more than paved cow paths. I know of two hills that are 1st gear up and 1st gear down. I can't wait to get a lower gearset. If you are deadset on lower rpms get a gearvendors, that way you can split all five in the gutbag.

 

I believe you can go up in ratio FROM 3.07 in a 3.07 housing. However, you cannot install 3.07 in a NON 3.07 housing. I believe you just need the Differentials and the gears. I have a slushbox and it is perfectly happy towing 10,000 over the Grapevine in Drive with the gear vendors off, or 2nd with the Gear Vendors on.

 

I agree. From the R&D I done I can get a 4.11 set for my front 61, albeit the sets are more expensive for the 61 than the 60 and the available ratios are few. Also I figured by the time I buy the ring and pinion, and the master kit and the spreader for my 61 I would have more in the job than finding a complete front 60, which are apparently harder to find than I thought. Plus a couple of guys have shown interest in my housings which would recoup some of my expenses. Sound clear as mud??

 

I worked on LOTS of Dana 60's without a spreader. Changing gears at the Dragstrip was never my favorite thing to do! That said, I have seen many housings ruined with a spreader.
Yes, it is easier to do with one. (but not much) and usually the shims that come out will be spot on for backlash. USUALLY!
If you do have one for a 60-70, it is just a drill bit away from working on your 61.
I made my own, and loaned it out. Never saw it again.
Just my 2cents.

 

OK lets see if I got it right ........3.07 is out of the question and 3.54 will only be a problem when the load is a little on the heavy side, this truck only has to take all my tractors and parts to Arkansas not bring them back to CA ever. Once I am outa here this truck will enjoy a life of ease just towing a 25ft trailer all over and maybe one tractor at a time once in a great while. So now the hunt for the rear end ?

 

I think 3.54's wil be fine. no 3.07's

 

heres my .02

i pull my dodge on a 20 x 8 tag trailer with my ford f150 it had the 2.73's ya ford'sanyhoot i swaped them out for 3.55's and its better but theres still a TON of clutch being burnt i have the 300 I6 and i get good torque but for towing a 1600lb trailer and how much ever my dodge weighs the 4.11's would be better

oh ya i got 9mpg with the 2.73's and still do with the 3.55's so 4.11's what could it hurt