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1991 F-Superduty Rear differential
So it appears you can get a "Thin" 3.73 gear set to take you under the carrier break. https://www.drivetrainshop.com/Dana_80_s/92.htm My reading, years ago, led me to believe that Ford and Dodge/GM used different D80's. I don't know the specifics of that.- mackinaw80
- Post #15
- Forum: 6.9L IH & 7.3L IDI Diesels
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1991 F-Superduty Rear differential
If you have 5.13 gears, the lowest you can go is 4.11, without doing a carrier swap. I have done this, personally, in my drive way. You can believe me more than the parts guy. The same applies going the other way. From the lowest supplied gear to the break point (4.10:1), it's simple. The...- mackinaw80
- Post #14
- Forum: 6.9L IH & 7.3L IDI Diesels
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1991 F-Superduty Rear differential
Higher gear ratios (5.13:1) have a smaller pinion. 5.13 pinion rotations vs 3.73 pinion rotations per 1 carrier rotation. Higher gear sets need more rotations, per carrier rotations, hence smaller As the ratio goes down (3.00:1), the pinion gets larger and the ring great moves to the left (away...- mackinaw80
- Post #11
- Forum: 6.9L IH & 7.3L IDI Diesels
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1991 F-Superduty Rear differential
I have a '92 F Superduty that had 5.13's. It was out of fluid when I got it, I missed it and the ring/pinion was toast. I googled the crap out of it and found the carrier break is at 4.10. I put 4.11 (they have a set right above the break) with no modifications. Speedo reads off the carrier, so...- mackinaw80
- Post #9
- Forum: 6.9L IH & 7.3L IDI Diesels
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What order to pull Turbo and I P?
Damn. That sounds way easier than trying to drop the turbo on top of the stand and getting all the crap to line up, and reach the bolts on the bottom.- mackinaw80
- Post #3
- Forum: 6.9L IH & 7.3L IDI Diesels
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Brake Caliper or Hose
From a guy that does a lot of brake work, replace both hoses (rh and lh) and both calipers. It's nearly impossible to tell which is causing your issue. If you do one at a time you will spend all the time/frustration it takes to swap and bleed components. I recommend both calipers because the new...- mackinaw80
- Post #7
- Forum: 6.9L IH & 7.3L IDI Diesels
