8.8 upside down - JeepForum.com
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post #1 of 14 Old 05-07-2018, 05:50 PM Thread Starter
curse
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8.8 upside down

What would happen if I installed my 8.8 upside down? As in the brake calipers going forward or the abs gear facing down? Would tires rotate backwards?

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post #2 of 14 Old 05-07-2018, 06:23 PM
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Yes, unless you ground a custom cam to be able to turn your engine backwards. At one long ago time in US track racing history it was felt that perhaps having an engine rotate/torque opposite would increase wheel weight on the inside (left handed turns on circle track) so this was done by several teams. This loads the left side due to engine torque effect, rather than unloading it. Upside down rear axle, custom grind a cam that would allow the engine to rotate backwards. It turned out to be a bust, similar as using like 50 feet of fuel line looped back and forth to increase the amount of fuel a vehicle could carry. Limit was to tank size, but not how large or how long the fuel line from the tank to the engine could be. Lotta tricky stuff in early racing history if you read about it. Smokey Yunik did this back in the day.
Currently in some dual engine side by side racing boats, the right side engine rotates opposite to help cancel the torque effect of having twin powerful inboard racing engines torquing the same direction. Not sure if this is a common thing though, but pretty sure this would be a very very long run for a real short slide for you.

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post #3 of 14 Old 05-07-2018, 06:41 PM
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Only if you kept it in the rear.


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post #4 of 14 Old 05-07-2018, 06:54 PM
Joe Dillard
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If you're talking about the entire axle so that the pinion gear/drive shaft yoke is up high - think carefully as to what you'll be doing to the lubrication system & slinger.

Read this while you're at it: https://www.jalopyjournal.com/forum/...d-axle.657729/

I think you'd be.......cursed
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post #5 of 14 Old 05-07-2018, 06:59 PM
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Quote:
Originally Posted by Opihi59
Currently in some dual engine side by side racing boats, the right side engine rotates opposite to help cancel the torque effect of having twin powerful inboard racing engines torquing the same direction. Not sure if this is a common thing though, but pretty sure this would be a very very long run for a real short slide for you.
From what I've seen, twin screw boats almost always have counter rotating props these days.
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[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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post #6 of 14 Old 05-08-2018, 03:53 PM
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Quote:
Originally Posted by fishadventure View Post
From what I've seen, twin screw boats almost always have counter rotating props these days.
But airplanes don't which turn far larger props and generate way more torque off the centerline.....Figured it was worth mentioning.


Anyway, I think Joe Dillard makes the the point you need to be concerned with....lubrication is a big concern upside down and the diff has a catch pit in the bottom to pick up random metal and debris so it doesn't get chewed up in the gears.


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post #7 of 14 Old 05-08-2018, 04:16 PM
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Quote:
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But airplanes don't which turn far larger props and generate way more torque off the centerline.....Figured it was worth mentioning.
I wasn't going to bring that up, but someone else did.

The nicer ones have counter-rotating props, and yes, it's because of the torque.

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post #8 of 14 Old 05-08-2018, 06:08 PM Thread Starter
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What...no replies like "you didn't do that did you?"

I was running brake lines and saw this plug at the top of axle and nearly crapped my pants. I sat back a minute in disbelief then watched a video and checked some posts and realized it was correct. I remember some people saying they fill the diff using the abs sensor at the top of axle, that's when I realized it was correct. But, why not use the fill plug just below the abs sensor?

Also what do people plug the hole with after removing the abs sensor?

plug at top of axle that I thought was a drain plug....
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post #9 of 14 Old 05-08-2018, 06:12 PM Thread Starter
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And the plug under abs sensor
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post #10 of 14 Old 05-08-2018, 06:22 PM Thread Starter
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I got my answer on what to do with the abs sensor. Leave it for now.
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post #11 of 14 Old 05-08-2018, 06:39 PM
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I woudn't do it due to the aforementioned lubrication issues. Gotta be an easy way to do what everybody else does
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post #12 of 14 Old 05-08-2018, 08:13 PM
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When flipping an axle over, lubrication is the least of ones problem. it would give you one very low forward gear and 4 or 5 reverse gears depending on how many gears in the trans. The fun would begin when you locked in the front axle and one end of the jeep wants to go one way and the other end wants to go the other way.
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post #13 of 14 Old 05-09-2018, 04:34 AM
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Just put the motor in the back. Problem solved.

Of course, if you are building a rear engine rig with flipped axles, I doubt an 8.8 will be part of the discussion.


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post #14 of 14 Old 05-10-2018, 09:08 AM
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Quote:
Originally Posted by wizekrakr View Post
When flipping an axle over, lubrication is the least of ones problem. it would give you one very low forward gear and 4 or 5 reverse gears depending on how many gears in the trans. The fun would begin when you locked in the front axle and one end of the jeep wants to go one way and the other end wants to go the other way.
That's one reason why I mentioned earlier; "Read this while you're at it...." and supplied a link. Covers both bases that way, plus more.
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