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Old 09-11-2019, 10:45 AM   #1 (permalink)
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Dodge Dana 70U....Spoon feed me

Just a small joke since he was asking about D70 brakes...


So anyway, I have a '93 1st gen Dodge W250 with the 32 spline rear D70U axle. On the highway Monday I lost a rear axle seal and cooked the bearings, so I'm repairing the thing now. I figured since I'm going to have it apart, I may as well upgrade. Can I just use a 35 spline D70 carrier/spiders and 35 spline Yukon shafts to upgrade it? The stock shafts are 1.41" in diameter and the 35 splines are 1.5", there looks to be plenty of room in the spindles for a bigger shaft to clear. If this is possible I was going to install a 35 spline Detroit and the yukon shafts, but is there is a carrier bearing difference between 32 spline carriers and the 35 spline detroit carrier? How about between the 70hd and regular d70, both with 35 splines, is there any fitment issues?
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Old 09-11-2019, 10:55 AM   #2 (permalink)
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I believe the only difference 32 to 35 spline is the side gears. Carriers should swap. HD carriers are different. They are narrower IIRC to accomodate the larger carrier bearings.
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Old 09-12-2019, 03:21 PM   #3 (permalink)
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Turns out the race in the hub spun and now I need a new hub as well. That style hub seems to be uncommon
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Old 09-12-2019, 09:46 PM   #4 (permalink)
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I have a 35 spline 70U Detroit for sale. And some 4.10s.
That’s what I did on mine, got the “cut to length” Yukon shafts and the 35 spline Detroit. Worked great. Only reason I’m selling is because I went with 5.13s and needed the other carrier split.
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Old 09-13-2019, 09:34 AM   #5 (permalink)
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Not sure where the gear split is on the carrier, I have 3.55's now ( I thinks it's 4.10?) . I also have to wait and see if I can locate a hub and unfuck the threads on the spindle. That D70 has the genius Dodge design of the brake drum behind the hub and not vice versa. I'm having a hard time finding one local and the one I found on ebay was $200 plus shipping. Just looking at it cost wise, I'm getting less sure I want to spend $200 for the hub, $400 for axles and $$ for a Detroit when I can find a 14 bolt for cheap and swap it in...
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Last edited by wheelerfreak; 09-13-2019 at 09:34 AM.
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Old 09-13-2019, 10:35 AM   #6 (permalink)
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Originally Posted by wheelerfreak View Post
Not sure where the gear split is on the carrier, I have 3.55's now ( I thinks it's 4.10?) . I also have to wait and see if I can locate a hub and unfuck the threads on the spindle. That D70 has the genius Dodge design of the brake drum behind the hub and not vice versa. I'm having a hard time finding one local and the one I found on ebay was $200 plus shipping. Just looking at it cost wise, I'm getting less sure I want to spend $200 for the hub, $400 for axles and $$ for a Detroit when I can find a 14 bolt for cheap and swap it in...
Don't single out Dodge for using the classic/standard Dana brake drum position

Sounds like way too much to spend on a 32-spline 70u. These are $200 diffs any day of the week except for the few knuckleheads charging cummins tax. Until '91.5, they were 35 spline... look for studs/nuts and cones on the axle flanges instead of bolts. An older 70B (pre '85?) has larger pinion bearings.

At the ~$400 threshold, you can get yourself a 2ndgen Dana 80 pretty easy. (what I did)
https://ramchargercentral.com/axle-t...stcoast-style/

You won't get 3.54 with a 14bFF. OTOH, a Ford 10.25" does, and has the drum style you want. Lockright has worked well for me in D60/70/80 and ford 10.25".
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