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Unread 07-05-2010, 10:13 PM   #1
alex_c
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Ford 9" or 8.8" swap?

So here's the deal.

I wanna run 33" tires, but I have 3.07 gears and a 30/35 combo.

I need lower gearing!

I have a line on a 9" from an EB with 3.55 gears for $350. From what I understand, this is an excellent axle.

My original build plan called for 4.10 gears from an 8.8 out of a late model explorer...but I don't think 3.55 gears would be that bad with 33" tires. Obviously the option to re-gear later would be there, if I want to go with 4.56 or 4.88 gears.

So all you guys with 3.55 gears and 33 tires, how is it? I know that's a common ratio for an XJ, and it would be nice to get an HP D30 with that gearing for a cheap match.


I need some advice!! What are the pros/cons of the 8.8" and the 9" respectively. I know the 9" is beefier and have two pinion bearings, and the 8.8" uses c-clips, but not a whole lot more about these axles.

I already have the brackets, I just need some axles

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Unread 07-05-2010, 10:19 PM   #2
bruteboy
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the 9 inch will have a 5 on 5.5 bolt pattern for the wheels
the 8.8 has 5 on 4.5 and will match your front
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Unread 07-05-2010, 10:23 PM   #3
alex_c
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oh yeah, I forgot about that. I was wondering if the EB 9" was 5.5.
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Unread 07-05-2010, 10:24 PM   #4
EugeneTheTJ
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you can also run a much bigger tire on a 9"

9" can also be cut to the same WMS as stock. 8.8" is narrower
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Unread 07-05-2010, 10:26 PM   #5
MisfitSeven
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my buddy just put 2" springs and 33" BFG KM1s on his '89 YJ with 3.55 gears. its fine to drive, the power is there even with the carburetor.

but 4.10s would be optimum, even if you decided to go to 35s later on.
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Unread 07-05-2010, 10:28 PM   #6
EugeneTheTJ
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Quote:
Originally Posted by MisfitSeven View Post
but 4.10s would be optimum, even if you decided to go to 35s later on.
horrible advice. If you are planning on 35s I would get 4.56 or 4.88 gears.
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Unread 07-05-2010, 10:35 PM   #7
Jerry Bransford
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3.55 only works "ok" with 33" tires on the XJ because most XJs came with the 4-speed AW4 automatic transmission. An automatic transmission is much more forgiving of running the wrong (too high of a) ratio. 3.55 doesn't work well at all for 33" tires with a manual transmission.
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Unread 07-05-2010, 10:42 PM   #8
alex_c
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So it's well worth it to hold off and keep looking for an 8.8 with 4.10, discs, LSD, and proper wheel spacing.
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Unread 07-05-2010, 10:46 PM   #9
KKiowaTJ
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IMO get the 9". You can get a third member already set up with the gears you want on a spool or locker cheap. That and the 9" will hold bigger and has alot more potential. Good luck either way
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Unread 07-05-2010, 11:45 PM   #10
alex_c
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yeah, I think it's going to be less overall hassle to run the 8.8

I don't think I'll go bigger than 35's any time in the near future.
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ford , 9" , 8.8 , swap , advice , help

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