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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 02-05-2008, 07:15 PM
jsgoss02 jsgoss02 is offline
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H9 axle code

Wanted to throw this out there and see what other's think. My code on the door panel for the axle reads H9. H9 code indicates the rear differential should be a 3.55 Limited Slip. Now, this is a 92 Ford F150, 4x4, E4OD, and 5.8 EFI engine. I really believe that the original rear differential may have been removed. This is why I think this. At 55mph, the rpms are 1600. I could be wrong, but I would've thought that 3.55's would turn more rpms at this speed. The wheels are 31's. Also, one back wheel will spin by itself in the back. Would not both wheels spin with limited slip? What do you guys think? Thanks.
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Old 02-05-2008, 07:20 PM
cjg1999 cjg1999 is offline
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1600 rpm could be a result of the E4OD as it has a good OD gear. Also with the one wheel spin, if the truck has a lot of miles, the locker could be worn out and need of a rebuild. The way you can tell is on the back cover of the rear there should be a tag, if it still a 3.55 locker, it should say 3L55 and some other numbers. Take a look and see if its there, good luck!
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Old 02-05-2008, 07:52 PM
Fordman_Evs Fordman_Evs is offline
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H9 is 3.55LS I turn about 2000rpm at 60mph... so that seems about right. The overdrive on my 5 speed is .79.
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Old 02-05-2008, 07:57 PM
THE KING THE KING is offline
 
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Quote:
I turn about 2000rpm at 60mph
Wow, What RPM's do you run at 70? Im at 2 grand at 72 MPH... Bout 1700 at 60, 1400-1500 at 55
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Old 02-05-2008, 08:34 PM
Fordman_Evs Fordman_Evs is offline
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Quote:
Originally Posted by THE KING
Wow, What RPM's do you run at 70? Im at 2 grand at 72 MPH... Bout 1700 at 60, 1400-1500 at 55
About 2500 rpm at 70mph.
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Old 02-05-2008, 08:52 PM
THE KING THE KING is offline
 
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you have a manual but is that when your in OD?
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Old 02-05-2008, 08:56 PM
THE KING THE KING is offline
 
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Thats some high R's, my truck SUCKS the gas anything over 2 grand.
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Old 02-05-2008, 11:36 PM
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I turn about the same with a AOD and a 5.0L
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Old 02-05-2008, 11:38 PM
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There is something wrong with that man. it shouldn't be that high
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Old 02-05-2008, 11:41 PM
Fordman_Evs Fordman_Evs is offline
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Yeah my truck likes the gas and yes that is in 5th (OD)...and I still want 4.10's.
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Old 02-05-2008, 11:43 PM
Fordman_Evs Fordman_Evs is offline
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Quote:
Originally Posted by BroncoChris88
There is something wrong with that man. it shouldn't be that high
I installed the tach from another cluster maybe I screwed up but I don't think so. I'm going to double check those figures tomorrow on the way to work.
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Old 02-05-2008, 11:56 PM
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oh ok that may make some sense
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Old 02-06-2008, 08:50 AM
THE KING THE KING is offline
 
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lol i didnt want to be the bear of bad news lol. Even tho its a manual i would think it should be around 2 still, if not i wouldnt want that gas bill.....
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Old 02-06-2008, 11:13 AM
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Quote:
Originally Posted by jsgoss02
Wanted to throw this out there and see what other's think. My code on the door panel for the axle reads H9. H9 code indicates the rear differential should be a 3.55 Limited Slip. Now, this is a 92 Ford F150, 4x4, E4OD, and 5.8 EFI engine. I really believe that the original rear differential may have been removed. This is why I think this. At 55mph, the rpms are 1600. I could be wrong, but I would've thought that 3.55's would turn more rpms at this speed. The wheels are 31's. Also, one back wheel will spin by itself in the back. Would not both wheels spin with limited slip? What do you guys think? Thanks.
My 1990 5.8 has 3.55 gears and when it did have an E40D I was running right were you are. also with 31x10.50s.

now with my 5 speed I am running 2400 at 70 and 1500 at 45. 5th gear is a .84.
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Old 02-06-2008, 11:15 AM
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my 90 E40D had a .68 OD.
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Old 02-06-2008, 11:15 AM
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