94-02 D70 rear brake swap - spoon feed me - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-16-2019, 03:56 PM   #1 (permalink)
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94-02 D70 rear brake swap - spoon feed me

My 02 2500 has a rear dana 80 with a pinion bearing that is non-existent. It also has 3.54 and i want to go to 4.10s.

Since the SRW 80 is a hybrid with the 70 outers, can I purchase a 94+ SRW dana 70 and the brakes will swap right over? Or was the backing plate changed in 01.5?

All i can find is people on the cummins forum paying way too much for aftermarket discs, or 3rd gen upgrades.
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Old 08-17-2019, 01:52 AM   #2 (permalink)
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Different backing plate flange for disc vs drum.
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Old 08-17-2019, 11:06 AM   #3 (permalink)
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Different backing plate flange for disc vs drum.
Guess I need to clarify.

Is the flange were the bracket/plate mount the same?

For instance, take my brakes of the SRW 02 axle I have, and they bolt right onto a 97 SRW d70?
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Old 08-17-2019, 04:22 PM   #4 (permalink)
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No. The flange is different. I have 2ndgen diffs with both style brakes for reference.
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Old 08-18-2019, 12:57 AM   #5 (permalink)
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No. The flange is different. I have 2ndgen diffs with both style brakes for reference.
Well shit. Much appreciated info though.

At this point it's less expensive to swap in another axle. Dana 80 shit is expensive, hopefully some diesel goober will want the axle.

I've even though about a sterling rear and SD 99-04 outers on the front
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Old 08-19-2019, 05:05 AM   #6 (permalink)
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Different backing plate flange for disc vs drum.
Too different to weld and re-drill?
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Old 08-19-2019, 06:54 AM   #7 (permalink)
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The disc flange is larger and thicker... so maybe. Not sure if it's position on the axle tube is the same.

Also, the SRW hub is different between say a 94-95 drum and 02 disc.
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Old 08-21-2019, 10:48 AM   #8 (permalink)
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The WMS is also wider on disc axles isn't it, at least vs 94-95? Dunno when that changed, but the disc trucks have the wheels with more backspace. I don't know if that is just in the hub/brake set-up, or is the housing/spindle spacing different too.
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Old 08-22-2019, 01:17 AM   #9 (permalink)
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The WMS is also wider on disc axles isn't it, at least vs 94-95? Dunno when that changed, but the disc trucks have the wheels with more backspace. I don't know if that is just in the hub/brake set-up, or is the housing/spindle spacing different too.
Travis.
Diffs I have and measured:
'94 SRW drum D80 is ~70" wms
'02 SRW disc D80 is ~71" wms

The hub stickout on the disc diff is less. The 16x8 alum wheels showed up for '00. The early drums are finned (i.e. 94-95) The later drums are smooth. (i.e. '00). You have to grind the early drums to fit the 16x8 wheels.

What hubs the late drum diff uses.... ???

Car-Part.com--Used Auto Parts Market shows the axle shaft being the same 94-02.
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Old 08-22-2019, 10:34 AM   #10 (permalink)
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Diffs I have and measured:
'94 SRW drum D80 is ~70" wms
'02 SRW disc D80 is ~71" wms

The hub stickout on the disc diff is less. The 16x8 alum wheels showed up for '00. The early drums are finned (i.e. 94-95) The later drums are smooth. (i.e. '00). You have to grind the early drums to fit the 16x8 wheels.

What hubs the late drum diff uses.... ???

Car-Part.com--Used Auto Parts Market shows the axle shaft being the same 94-02.
That is all excellent info right there. I had looked in the past and couldn't find anyone who had actually measured each one personally. I knew the disc rear was 71" since I had one to measure. It must just be the different wheels on the drum trucks that make the rears look so much narrower, 1" is really nothing.
Travis..
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Old 08-24-2019, 11:43 PM   #11 (permalink)
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, or 3rd gen upgrades.
What 3rd Gen upgrade are you talking about? Front rotors/caliper brackets?
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Old 09-08-2019, 05:59 PM   #12 (permalink)
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disc brakes

My brother has a 98.4 12 valve truck and he I think this week swapped out the rear end to a disc brake . His had drums and he wanted disc so he swapped out the entire rear end . Said it was a bolt in deal I think . He and I prefer 12 valve trucks mine is a 95
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