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Old 02-11-2007, 07:05 PM   #1
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Question Rear Diff Types

I getting ready to put the lift on my 04 Jeep and I couldn't decide what size tires to go with. The local 4X4 shop told me to look at my rear diff and find out if I had 354 or 373 Rear Diff. So I crawled under my baby and I couldn't find either of those two numbers. Does anyone know exactly where to find them without having to do the turning tire deal?

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Old 02-11-2007, 07:19 PM   #2
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There should be a metal tag bolted to your diff cover. It will have some numbers on it, one will be your gear ratio

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Old 02-11-2007, 08:01 PM   #3
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3:54,s were only used in 97&98?
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Old 02-11-2007, 11:04 PM   #4
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So it has to 373 then?
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Old 02-11-2007, 11:07 PM   #5
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Why does the shop need to know the gears?
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Old 02-11-2007, 11:09 PM   #6
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and why can't the shop look themselves if they want to know...

seems odd. maybe you should consider another shop.....
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Old 02-11-2007, 11:12 PM   #7
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Oh wait, for the tire size.. you have a 6 or a 4? 5spd or auto? If the 6 either of those with 33's is fine.. although the 3.73's would be a bit better.
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Old 02-12-2007, 12:48 AM   #8
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Mine is just stamped on the differential. Unless therer has been a lot of mods I would be pretty confident that what it has stamped is right.
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Old 02-12-2007, 09:48 AM   #9
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Quote:
Originally Posted by easyriderman72 View Post
I getting ready to put the lift on my 04 Jeep and I couldn't decide what size tires to go with. The local 4X4 shop told me to look at my rear diff and find out if I had 354 or 373 Rear Diff. So I crawled under my baby and I couldn't find either of those two numbers. Does anyone know exactly where to find them without having to do the turning tire deal?
you could have 3.07's.
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Old 02-13-2007, 05:32 PM   #10
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The shop told me if I had 3.73 I could run 33's and not effect my gas mileage as much. I've made up my mind and no matter what I'm rolling 33's.
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Old 02-13-2007, 07:58 PM   #11
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The shop told me if I had 3.73 I could run 33's and not effect my gas mileage as much. I've made up my mind and no matter what I'm rolling 33's.
i've heard many disaster stories of 33's on dana 35...that thing is always on my mind when wheeling...so i'm very gentle and use finesse and i stop as soon as i start spinning AT ALL. you should be very gentle too.
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Old 02-13-2007, 10:51 PM   #12
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So what would you so would be the solution to the problem of brakage?
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Old 02-13-2007, 11:16 PM   #13
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i've heard many disaster stories of 33's on dana 35...that thing is always on my mind when wheeling...so i'm very gentle and use finesse and i stop as soon as i start spinning AT ALL. you should be very gentle too.

In your opinion, would that be resolved by running 32's?
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Old 02-14-2007, 12:11 AM   #14
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Don't run a full locker in the rear and have some spare shafts on hand. Running 32's aren't that much different than 33's. It's not the tire spinning that hurts it bigjeep, it's the sudden deceleration when that spinning wheel that grabs traction and snaps axles.
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Old 02-14-2007, 08:17 AM   #15
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Don't run a full locker in the rear and have some spare shafts on hand. Running 32's aren't that much different than 33's. It's not the tire spinning that hurts it bigjeep, it's the sudden deceleration when that spinning wheel that grabs traction and snaps axles.
yes i know this but there was a huge thread on this on another board and a bunch of the experienced guys were saying there were situations where the D35 broke that you wouldn't believe...in other words, the thing broke when they weren't even being hard on it. so thats why i don't let the tires spin too much...so that if they do suddenly grab traction then its not enough force to break it...
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Old 02-14-2007, 08:27 AM   #16
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In your opinion, would that be resolved by running 32's?
i've heard of much more people on 33's and bigger break an axle than i have of people on 32's and smaller...all i know is that i definitely won't go bigger than my 32's until i upgrade the axle. i'm sure if your gentle on it you'll be fine but i just don't wanna push it at all so i'm staying at 32's...
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Old 02-14-2007, 08:27 AM   #17
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Anything is possible but I belive if your just easy on it the d35 will be fine.


If you havent figured out the gear ratio yet, I believe that I remember seeing it stamped on the ring gear, so if your due for a diff lube change you can check.
^can someone verify(?) that^
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Old 02-14-2007, 03:08 PM   #18
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I run 33's and I haven't held too much back and my Dana 35 is doing fine. (knock on wood) As for gears, from the factory it will be either 3.73 or 3.07. Take your vin to the dealer and they will be able to tell you exactly what gears are in it.
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Old 02-14-2007, 03:09 PM   #19
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My bad..If you have a 4 banger you have 4.10 gears..there is no other options with the 4 banger.
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Old 02-14-2007, 03:53 PM   #20
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I think that the guys who run rocks alot are the ones breaking them.There are thousands of jeeps running the d35 with 33s with no trouble.I am running 33s with Detroit Tru Trac limited slips in the front and rear,6 cyl,5 speed and 4.10 gears.I mostly run trails that are off camber,steep and muddy.Isthe D35 bullet proof?No but there isn't an axle out there that is. Bill
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Old 02-14-2007, 04:35 PM   #21
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My bad..If you have a 4 banger you have 4.10 gears..there is no other options with the 4 banger.
05 and 06 4 bangers (SE's) come with 3.73's

I snapped a D35 axle on dry pavement, no locker with a 4 banger (98 SE) and I wasnt even getting in it. You never know when its going to break.
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Old 02-14-2007, 10:52 PM   #22
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Isthe D35 bullet proof?No but there isn't an axle out there that is. Bill

well i do know of one axle that is...rockwells on 26 inch tires with a 4 banger
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Old 02-15-2007, 12:01 PM   #23
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05 and 06 4 bangers (SE's) come with 3.73's

I snapped a D35 axle on dry pavement, no locker with a 4 banger (98 SE) and I wasnt even getting in it. You never know when its going to break.
My mistake! I know in 04 and 03 you could only get 4.10. I'm working on finding a 9 inch for mine. If I get real ambitious I might throw a 9 inch up front too..For some reason I feel like that is going to be expensive.
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Old 02-15-2007, 12:03 PM   #24
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well i do know of one axle that is...rockwells on 26 inch tires with a 4 banger
Yea that is true. Although I have a bolt action 50BMG that would put a hole through it though..haha
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Old 03-04-2007, 10:02 PM   #25
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I had the Jeep up on the lift at the shop and cleaned up the whole rear diff and finially found the metal tag, damn 3.07's. Time for an upgradge, but I still got 32's for now. Thanks for the help guys.
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