Axle Upgrade for pulling!

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Axle Upgrade for pulling!

Postby ryanihf250 » Thu Nov 13, 2008 5:32 pm

October I twisted the rear pinion out of the Dana 70 after my 3,000 rpm launch pulling(the track hooked alot better out of the hole than I thought)!
I was wondering what options I might have for a upgrade on the Dana 70. I believe I am going to need around a 4.88 gear ratio to keep the turbo spooled and not have to start out so hard. Would a Dana 80 out of a F-450 fit? I am looking for a cheap upgrade.
Playtoy:1992 Dodge 350 4x4 SRW Cummins. 6in lift, 35in Pro Comp X , Dana 80 swap 4:10 Pump maxed, BHAF, 6x16inj, 3200 GSK, Piston Lift Pump, II SPS turbo.Street Pulling truck project. www.libertyantiquetractorpull.com
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Postby RumbleFish » Thu Nov 13, 2008 7:20 pm

anything will fit really, you can put mounting pads whever youd like. but wouldnt the axle out of a 450 have 10 lug hubs? if you are looking for a cheap upgrade, id try a 14 bolt unless you can get a steal on a d80.
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Postby ryanihf250 » Thu Nov 13, 2008 7:36 pm

The 450 would have 10lug. I was just thinking the 450 would have the ratios I would need. I could cut the center out of the 450 wheels and weld them to some steel 16in wheels. How durable and dependable is the Dana 80. I am not going to put down more than 500hp to it.
Playtoy:1992 Dodge 350 4x4 SRW Cummins. 6in lift, 35in Pro Comp X , Dana 80 swap 4:10 Pump maxed, BHAF, 6x16inj, 3200 GSK, Piston Lift Pump, II SPS turbo.Street Pulling truck project. www.libertyantiquetractorpull.com
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Postby SChandler » Thu Nov 13, 2008 9:27 pm

From reading the CompD sled pull section, the Dana 80 shouldn't have a problem with 500hp. You can get a Dana 80 out of a 2nd gen Dodge and the width and spring perches will be close (from my understanding, don't take this as gospel) to work without cutting and welding. You need the non-dually Dana 80 from a 3500 or 2500 with manual trans. You would need to change gears to get to the 4.88, but it would be less work to make it fit and the Dodge 80 will have an 8-lug pattern, same as your current wheels.

Edit: I forgot to mention that you will need to shorten your driveshaft by an inch or so. The 80 has a longer pinion than the 70.
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Postby KTA » Fri Nov 14, 2008 7:30 am

I am running a Dana 80 out of a 99 F450 in a 1000+hp single turbo pulling truck. This is because at the time there was no such thing as billet axles as there is today and the stock ones and mosers broke for past time. It is still running stock Ford axles that are bigger than Dodge and in 300 hooks has only broken one. For the money it was still the way to go since the whole axle cost less than a set of billet shafts do, and it is 4.88 geared. The spring perches had to be moved and I had to make custom wheels to fit the big 8 bolt pattern of the ford, but otherwise it worked great. 8)
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby CumminsPride » Fri Nov 14, 2008 2:00 pm

Don't alot of associations require the truck to have an overall stock appearance? So would the larger axles, poosibly a 10bolt wheel pattern, put you out of a class?
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Postby RumbleFish » Fri Nov 14, 2008 7:40 pm

not if you run 8 lug hubcaps!
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Postby GO OVRIT » Fri Nov 14, 2008 9:06 pm

I want to hear more about the 1000hp pulling truck. :D
92 W250 ext cab 518, big sticks, a-1000, PDR HX40, 4" exhaust w/aeroturbine, pump tweaked, K&N filter Tims Cooler tubes and 3" i/c, gauges
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Postby bgilbert » Sat Nov 15, 2008 2:34 pm

F450 rearend: I just looked at one of these monsters today at the junkyard. I would guess the Ford was a 99-02 model. The thing was HUGE!!!. Had disc brakes too :shock: .
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Postby ryanihf250 » Sun Nov 16, 2008 8:09 am

My good friend is a manager at a auto recycler so I may be able to get a 450 rearend at a reasonble price if they have one in stock.
Kta how much trouble is it really going to be to get it to fit in the 92 Dodge?
Or Would it just be better to find a Dana 80 and change the ratio.
Playtoy:1992 Dodge 350 4x4 SRW Cummins. 6in lift, 35in Pro Comp X , Dana 80 swap 4:10 Pump maxed, BHAF, 6x16inj, 3200 GSK, Piston Lift Pump, II SPS turbo.Street Pulling truck project. www.libertyantiquetractorpull.com
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Postby KTA » Mon Nov 17, 2008 7:34 am

Besides cutting off and moving the spring perches and building custom wheels it is no problem to get to fit. If you can fabricate and weld I would say probably 2 hours worth of extra work vs using a Dodge Dana 80. You also get much heavier wheel bearings which is nice if you pull heavy loads. :lol:
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby SChandler » Mon Nov 17, 2008 8:36 am

The F450 rear has the 37 spline axles and 8x170mm bolt pattern, right? If so, why not use the Dodge brakes to get back to the 8x6.5 (8x165.1mm) bolt pattern? That would eliminate the custom wheels from the swap. What am I missing?
1992 W250, 300k, Getrag, BHAF, 4" exhaust, DDP fuel pin, Isspro gauges, +3 on the fuel screw, 3200rpm gov. spring, 16cm^2 housing
http://s230.photobucket.com/albums/ee261/dieselsam250/
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Postby KTA » Thu Nov 20, 2008 7:29 am

The F450 axle is a true Dana 80. As such the wheel end equipment is bigger. The Dodge Dana 80 is a HYBRID. It uses dana 70 wheel end equipment. That means the dodge stuff is too small to fit on the axle. If you look at a Dodge 80 you will see the tube necks down after the spring perches, the Ford 80 does not. If you could somehow find a way to make it fit then you are back to needing custom axles because there are no 37 spline stock dodge axles and the flange is much bigger on the Ford so it wont bolt up to the dodge hub. It was much easier to just make a custom wheel and keep the big nice Ford brakes. 8)
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby SChandler » Thu Nov 20, 2008 10:08 am

Ok, that makes sense. I've never actually seen a Dodge and Ford Dana 80 side by side, so I figured I was missing something. Thanks.
1992 W250, 300k, Getrag, BHAF, 4" exhaust, DDP fuel pin, Isspro gauges, +3 on the fuel screw, 3200rpm gov. spring, 16cm^2 housing
http://s230.photobucket.com/albums/ee261/dieselsam250/
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Postby Philip » Thu Nov 20, 2008 10:09 am

KTA I have a question. It isn't about setting up a puller axle. So I don't want to get to far off this thread.

Can the disk brake hardware be moved from a 80 rear axle to a 70 axle? Without to much machine work???

I have seen posted in other places where the 80's had the same ends as a 70.
93 W350 Club/cab w/duals, buckets & console, B&W flatbed, G56, 6 spd, 3:07 rears, gages, HX40/16, 4" exhaust, 6X.018 sticks, rear air ride suspension
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