Rear end gears

[CESMITH]

I just puled the cover on the rear end of the 86 , it has 39 teeth on the ring gear and 10 on the pinion thats 3.9- 1 ratio or am i wrong. I gess I though it had 4.10 -1 I know there close but I though the faster one should be in the front . the front has 4.10 -1 Dana 60.The rear It is a limited slip wich I didnt know Oh and it is a sterling

 

[gunz]

I suspect one axle has been swapped, they should match in ratios.

 

[CESMITH]

The front was changed it had aTTB44 wich was shot

 

[Silver Burner]

Don't put it in 4X4 if that's the case....bad things can happen...

 

[bghnkinf350]

4.09 and 4.11 is close enough (common differences in Dana and Sterling ratios), but 3.9 and 4.10 is really pushing it. You could very well never notice it on soft surfaces, but it very well could accelerate wear on parts or damage things. I could not find a Sterling 3.90 ratio BUT a 3.55 gear set has 39 teeth on the ring gear and 11 on the pinion. Double check your counts! If the rear is 3.55 DO NOT use 4 wheel drive until you get it fixed.

 

[CESMITH]

Its late Ill check it again in the am . Ive got the front apart now ,3.55 would be easy to change

 

[bghnkinf350]

I would rather change the rear gears than the fronts!

 

[CESMITH]

Buy that man a beer I could have swore when I rebult that truck 2years ago it had 4.10s in it , no wonder it was noisy its agood thing I didnt break something . I would rather have 3.55 anyway , for the mileage. thanks ED

 

[bghnkinf350]

No problem, good luck! That front will be more intensive to change ratios than the rear.

 

[ocnorb]

I just puled the cover on the rear end of the 86 , it has 39 teeth on the ring gear and 10 on the pinion thats 3.9- 1 ratio or am i wrong. I gess I though it had 4.10 -1 I know there close but I though the faster one should be in the front . the front has 4.10 -1 Dana 60.The rear It is a limited slip wich I didnt know Oh and it is a sterling

It sounds like you may have missed a gear on the ring... looking on Randy's R&P page shows no 3.90 gears:
http://www.ringpinion.com/PartsList.aspx?SearchMode=Make&MakeID=2&ModelID=255&Side=Rear&DriveType=4WD&DiffID=155&Make=Ford&Model=F-350+1+Ton&Diff=Ford+10.25%22&CatID=35&Category=Ring+%26+Pinion+Sets

 

[fordf350dually]

my ads fc170 has factory 4.88's in the rear and 4.89's in the front. kinda odd but thats wat it is

 

[CESMITH]

thanks for allthe replies , now Im on the hunt for 3.54 gears for D60 front . (reverse rotation) It seems that gear ratio is the most expensive. 4.10s are cheep does anyone know of any fitment issues in going from 4.10 -3.54 (say a diffrent carrier or anything) Randys Ring and Pinon seems to be the cheepest Thanks ED

 

[bghnkinf350]

A quick search shows there is no carrier split on a front 60 (atleast that is what the internet says - so take it with a grain of salt) but the split would be at 4.10 anyway so you are good. Have you done a gear swap before? Danas can be more costly than the Sterling. They need set up bearings and and can be a bit more of a pain to correctly do a 60 front than a Sterling rear (less to remove/replace when doing the rear). Are you going to be doing any major hauling? Either way, good luck!

 

[towtruckdave]

thanks for allthe replies , now Im on the hunt for 3.54 gears for D60 front . (reverse rotation) It seems that gear ratio is the most expensive. 4.10s are cheep does anyone know of any fitment issues in going from 4.10 -3.54 (say a diffrent carrier or anything) Randys Ring and Pinon seems to be the cheepest Thanks ED

I have a dana60 with a 3.54 ratio and I need a 4.10.

My 60 is a 1986 with king pins and low miles. Everything is greased up and tight with very little wear. If yours has kingpins and is nice, I would trade. Or we could just swap ring and pinions.


I am also looking for a locking diff for my front dana60 if anyone has one?


Maybe we could trade. I am 20 miles south of Cleveland, right off I71. (44133) I am 75 miles away from you.

 

[CESMITH]

Dave I might take you up on that ,Iv got alot of money in this housing (kingpins, spindles, tierods,ect)I would be intrested in swaping gears let me know Ed cell 330-540-2129