Guys can a Dana 70 rear axle from a 1965 to 1972 F350 run a 3.54 ring and pinion with a carrier change? I have been told 4.10 is the tallest gear that can be run in these year model axles. Could someone also tell me if braking and / or stoping a load would be significantly improved if replacing a Dana 60 under a 1966 F250. Any advice / information appreciated. Thanks!

 

3.54's should change. You have to give us some specs on the brakes, but yes, the Dana 70 will have bigger brakes and therefore stopping power would increase.

 

Dana 70 not available with 3.54.

1961/65: 4.86 - 5.23 - 5.87. 1966: add 4.10 & 4.56. 1967/79: add 3.73, subtract 5.87.

3.73 & 4.10 use a different case than the other ratios.

 

That's what I needed to know. Thanks!

 

Dana 70's may not have been sold with 3.54's under Fords between '65 and '72, but you can put 3.54's in any Dana 70.

 

Will it work with a 4.10 carrier?

 

Yes,the carrier break is between 4.56's and 4.10's.

 

So I can swap the 5.13 ring/pinion in my '61 F-350 (with Dana 70) for a later 4.56 set without changing the carrier?

Thanks,

Steve

 

^ Yes, see post #3. ^
But where would someone find a Dana 70 3.54-1 ring & pinion? How much will it cost if found?

 

I would call my local drive train shop and pick up a set for about $230.

Or online for $205 plus shipping:

Motive Gear DANA 70 Gears

 

OP's 1965 F350 Dana 70's ring gear & companion flange have 10 splines, u-joint has 1310 sized cups.

1967 and later, the companion flange has 29 splines, but there are 3 different types as there are 3 different sizes of u-joint cups: 1310's, 1330's or 1350's.

Most likely the R&P that the OP buys, the ring gear will have 29 splines, so he'll have to change the companion flange.

 

If he finds a gear supplier and gives them the application, they should be able to come up with parts to swap right in. If the application won't do it, the BOM should.