1978 Eagle 05 Differential

[gpzzdrm]

I am doing a repower with a Cummins ISM / World Trans. and I am looking for a 4:10 ratio ring and pinion for my differential. It is a 1978 Eagle 05.
Anyone got any ideas where to look for this set of gears.

[Kristinsgrandpa]

http://www.trucks.com/parts_used_tires.asp

I don't know what your Eagle rearend is but, this outfit has shops in Ohio and Florida. They have gears and whole rearends out of trucks.

HTH, Ed

[Ericbsc]

Try Pinson Truck Parts in South Carolina. Large inventory of rear end parts, new and used. 864-578-0675

[David Anderson]

I thought all the eagles had a 3.36 or 3.73 rearend.  Did you change something?  I don't recognize that ratio.

David Anderson
1985 Eagle 10

[gpzzdrm]

I thought all the eagles had a 3.36 or 3.73 rearend.  Did you change something?  I don't recognize that ratio.

David Anderson
1985 Eagle 10

I currently have a 3:73 and wish to go to a 4:10 or 4:11. I am learning. Apparently my reference to 4:10 was wrong in that no Eagle ever had that ratio. However, I learned today that there were some made in the seventys that had 4:11 gears.
Thanks for your info.
Bill

[gpzzdrm]

http://www.trucks.com/parts_used_tires.asp

I don't know what your Eagle rearend is but, this outfit has shops in Ohio and Florida. They have gears and whole rearends out of trucks.

HTH, Ed

Thanks, I have looked there (both places). I bought my World Trans. through the Fla. yard.
Bill

[gpzzdrm]

Try Pinson Truck Parts in South Carolina. Large inventory of rear end parts, new and used. 864-578-0675

Thanks,
Never heard of them, but I will try there.
Bill

[scanzel]

Why would you want 4:10 or 4:11's. In my by gone street drag racing years those gears were great for the quarter mile run but bad on fuel for just cruising down the pike. My old Dodge power wagon had 5:38's in it, could pull a house down with that gearing but on the highway the flathead six screemed at 55 mph.You could hear me coming.

[gpzzdrm]

Why would you want 4:10 or 4:11's. In my by gone street drag racing years those gears were great for the quarter mile run but bad on fuel for just cruising down the pike. My old Dodge power wagon had 5:38's in it, could pull a house down with that gearing but on the highway the flathead six screemed at 55 mph.You could hear me coming.

I will have a World transmission with 5th / 6th gear Overdrive. The combination will give me far better accelleration from a stop, better grade performance, but it with the OD, I will have considerably better fuel economy than I have now. Further, the Cummins ISM has a huge improvement in HP and torque over the 8-71 we are swapping out. There is no comparison. I have been driving the 8-71 for almost 10 years and I sure won't claim that it has provided anything close to "good" mileage.  Further, if you look at specs, some of the high line coaches are running 4:30 and 4:33 gears with the transmission we are putting in.
Thanks for you thoughts.
Bill

[Tom Y]

Bill, Does your Eagle run a dropbox?  There was a guy in MO that had 4.10 w/dropbox.  What the litre of the ISM? I am putting in a L10 in a 5c and wish I had bought a truck for parts. I just bought a truck with a N14 for the wheels, should have bought one sooner in the project. Goodluck  Tom Y

[rv_safetyman]

Bill, Wayne St. Onge (sp?) had told me that he had a 4:10 (new I think).  He sold a lot of his parts to Wayne Schell. 

You should have both of the their phone numbers from the roster.

[gpzzdrm]

Bill, Does your Eagle run a dropbox?  There was a guy in MO that had 4.10 w/dropbox.  What the litre of the ISM? I am putting in a L10 in a 5c and wish I had bought a truck for parts. I just bought a truck with a N14 for the wheels, should have bought one sooner in the project. Goodluck  Tom Y

My Eagle does have a drop box. I believe all Eagles since the model 01 have them. The ISM is the latest evolution of the M11 and is 11 litres if I am correct.
Bill

[gpzzdrm]

Bill, Wayne St. Onge (sp?) had told me that he had a 4:10 (new I think).  He sold a lot of his parts to Wayne Schell. 

You should have both of the their phone numbers from the roster.

I will call St. Onge right away.
Bill

[Tom Y]

Bill, I traded my 4.10 or 4.11 from my MCI 5C for a 3.38 from a Eagle. I can find the # if you are intrested.  Not sure he still has it, as I did see it on Ebay. Let me know if you are intrested.  Tom Y

[gpzzdrm]

Bill, Does your Eagle run a dropbox?  There was a guy in MO that had 4.10 w/dropbox.  What the litre of the ISM? I am putting in a L10 in a 5c and wish I had bought a truck for parts. I just bought a truck with a N14 for the wheels, should have bought one sooner in the project. Goodluck  Tom Y

Tom,
Sorry it took so long to reply. Very busy for the past few weeks. The Cummins ISM is an 11 liter later version of the M11.
Bill