rear end identification
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Post Fiend
Joined: Jun 2005
Posts: 7,047
Likes: 2
From: North west La
You can find the code on a sticker under the door latch on the drivers side I have a h9 which is a 3.55 ratio limited slip 9.75 rearend. Post your code. I think I have them listed somewhere & I'll look it up for you.
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Freshman User
Joined: Jul 2005
Posts: 43
Likes: 0
it says i have a 3.55 non limited slip. i also noticed that they have a 3.55 limited slip axle. is the only difference between these the limited slip clutch packs? if so can you mount clutch packs on the non limited slip axle?
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
If it came with a 5.4L, it has a 9.75" rearend. If it has a 4.2L V6 or a 4.6L v8, then it has a 8.8" rearend. All use the 8.8" in the front if 4x4.
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Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
Originally Posted by LxMan1
If it came with a 5.4L, it has a 9.75" rearend. If it has a 4.2L V6 or a 4.6L v8, then it has a 8.8" rearend. All use the 8.8" in the front if 4x4.
of all the people, I'd figured I'd never had heard that out of you... the rear end info is completely not true.The 9.75s and 8.8s were both found behind 5.4s, about the only sure way to tell what rear you have is to get under the truck and look at the metal tag hanging from the rear diff, although they are different in shape and may bve idnetified through that.
Ignore the top line, it gives part numbers and such, it's that bottom line that'll give you the info that you need.
355 88 XXXX
or
355 975 XXXX
It reads the ratio (the 3 is usually under the bolt head), and then the ring gear size, then a julian build date code iirc.
The front will match the rear and must be changed simultaneously if you plan on using the 4x anytime soon. The front is a reverse cut 8.8, so you can't swap in a cheap set of 8.8 gears, you have to get the right cut to them.
-Kerry
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Tuned
Joined: Oct 2003
Posts: 295
Likes: 2
From: Ringgold GA.
thank you for clearing that up i was pretty shure of what I had but wasn't 100%. Also I diddn't know the front was reverse cut (that would have been embarassing at the mechanics shop). Thanks again guys, thats proof positive that FTE is truly first and best!!!!
