changing gear ratio..
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Senior User
Joined: Feb 2004
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From: St.Paul, MN
changing gear ratio..
i have the stock dana rear in my 55 ford, it has 3
2 stock gears and i am running tires a hare smaller. i want to keep the stock rear and i already ordered all my brakes and seals for it. my question is are there any other gears available for this particular axle? i want to run highway gears for the cruiseability. can a guy get the gears for a dana (44 or 60?) that they list for a later model? like in the jeeps and such?
thanks in advance
2 stock gears and i am running tires a hare smaller. i want to keep the stock rear and i already ordered all my brakes and seals for it. my question is are there any other gears available for this particular axle? i want to run highway gears for the cruiseability. can a guy get the gears for a dana (44 or 60?) that they list for a later model? like in the jeeps and such? thanks in advance
Postmaster
Joined: Dec 1999
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From: Connecticut
You don't want a R7P out of a Jeep as they're in the %.38 range, no speed or mileage there! I looked what was available for the Dana 44 and back then they had3.73, 3.92 ,4.09, 4.27 ratios. The 3.73 was used in trucks from 53-56. It carries a 55 T Bird part number, B5S 4209-A, I found 3 on the locator.
Green Sales, Cinci, Oh 1-800-543-4959 qty 1 in stock
Bowman Sales, Bowman, ND 1-800-472-2218 qty 1 ( old Ford dealer)
NOS only, San Jose, Ca 1-408-227-2353 qty 1
Call these places and see if they still have them and price.
You'll need a new driven gear in your tranny with the ratio change. Post your tire size , tranny, engine and I can see what gear it's supposed to take with the new ratio.
Barry
Green Sales, Cinci, Oh 1-800-543-4959 qty 1 in stock
Bowman Sales, Bowman, ND 1-800-472-2218 qty 1 ( old Ford dealer)
NOS only, San Jose, Ca 1-408-227-2353 qty 1
Call these places and see if they still have them and price.
You'll need a new driven gear in your tranny with the ratio change. Post your tire size , tranny, engine and I can see what gear it's supposed to take with the new ratio.
Barry
Postmaster
Joined: Mar 2000
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From: Waynesville, OH
Hey Barry, on the same subject, I need to start looking for some lower ratio gears for the DANA 60 in my 1956 F-250. It's got the 4.56 gears in there now and I'm wondering if I can take later DANA 60 gears and swap them in? 
Something between 3.25 and 3.75 sounds about right to me.
Something between 3.25 and 3.75 sounds about right to me.
Postmaster
Joined: Dec 1999
Posts: 2,813
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From: Connecticut
George- I did some digging and that axle was used up untill 1965. There was only 3 ratios, 4.10, 4.56, and 4.88 , with 10 spine axles. They have better ratios beginning in 1966, but the axle spines are different. They list a different carrier for the 4.10 gear, which also fits the 66 and up axles. It's C3TZ 4204-G . This carrier also fit a 3.54, 3.73 ratios in the 66 and up axles.
3.54 gears C6TZ 4209-E
3.73 gears C7TZ 4209-E
4.10 gears C3TZ 4209-AH
I looked at the pinion gears and the side gears part numbers and they go back to 55. It should work with the new R&P and case. I ran a look see for parts and can only find the 4.10 and the 3.73 gears, not the case that you need.
Southside Obs, Faribault, MN. 1-800-866-1310 has both gear sets.
It may be cheaper to swap the whole rear rather than swap gears.
Barry
3.54 gears C6TZ 4209-E
3.73 gears C7TZ 4209-E
4.10 gears C3TZ 4209-AH
I looked at the pinion gears and the side gears part numbers and they go back to 55. It should work with the new R&P and case. I ran a look see for parts and can only find the 4.10 and the 3.73 gears, not the case that you need.
Southside Obs, Faribault, MN. 1-800-866-1310 has both gear sets.
It may be cheaper to swap the whole rear rather than swap gears.
Barry
Postmaster
Joined: Mar 2000
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From: Waynesville, OH
Nathan, you know more about rear axles than I do. When Barry said I'd need a new carrier, I really wasn't sure what he meant. I haven't had time to study up on the rear axle parts and what works where and how. I'd certainly be interested in swapping the innards if they will fit in my axle housing without any grinding or drilling. 
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Postmaster
Joined: Dec 1999
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From: Connecticut
The carrier is what the ring gear bolts to. I was looking at it from using NOS parts perspective. THe only thing I could see on swapping later guts to an earlier case is the length of the axles. The book doesn't list lengths. If you switch the pinion gears in the late carrier to the 10 splines, you could use your axles and be safe.
Barry
Barry
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Lead Driver
Joined: Aug 2002
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From: Saskatoon SK Canada
I think the axle length would be the same. I know a '51 Dana 44 has the exact same axle length as a '68 9". If the rear axles have the same hub to hub length the axles should be the same size. Or you could do what Barry has said.
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Senior User
Joined: Feb 2004
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From: St.Paul, MN
is there any options for the 44 as in switching to the highway gears? what vehicles had the 44, and can i steal its gutz for my rear? i am running a c4 behind my 351c and want highway cruzin gears, no interest in the 3.92 really. i like my finned cover on my 44 also.
Lead Driver
Joined: Aug 2002
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From: Saskatoon SK Canada
You would probally have to find an older jeep. Try looking at the classifieds on an offroad site as there is bound to be someone trying to get rid of stock gears. Note any gear higher (numerically lower) than 3.92 requires a different carrier. Since the stock axles are 19 spline and newer ones are 30 spline you will have to reuse your stock spider gears in the new carrier. You can buy lockers for 19 spline also.
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From: St.Paul, MN
i am having a brain fart when you said carrier, i just take all the center section and housing or just its insides and guts and use my spiders that go with my axle shafts?. what kind of jeeps had the 44's, cj's and cherokee's?
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Senior User
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From: St.Paul, MN
ok brain fart passed, i just have to get my hands on the carrier n gears.
i think the 3.92 would be fun, but i do a lot of highway, and 3300 rpms at 70 dont sound like cruzin. i want to get into the 2400 rpm range. i just hope i have enough umph to get rolling.
i think the 3.92 would be fun, but i do a lot of highway, and 3300 rpms at 70 dont sound like cruzin. i want to get into the 2400 rpm range. i just hope i have enough umph to get rolling.
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