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  #1  
Old 06-25-2003, 09:22 AM
Sparc
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Differential swap part 2

I am attempting to change my differential on my 82 300D from the .344 to the .288...any ideas on what model/year I should look for a used one on?..thanks for your replies
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  #2  
Old 06-25-2003, 10:30 AM
Potomac German Auto
 
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407
Your 1982 300D (W123) should have a 3.07. I can imagine where you got a 3.44 installed, unless it's Euro.

If you want to go to a 2.88 you'll need a diff from an 85 (W123). !

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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."
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  #3  
Old 06-25-2003, 11:57 AM
Fimum Fit
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Gee, I thought only the turbo models had the 3.07

and that non-turboes did have something in the 3.44 range, but maybe my information is only correct for wagons.
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  #4  
Old 06-25-2003, 12:11 PM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
The labor involved in doing this is pretty excessive unless you really need a new differential. I personally would not undertake a differential swap just to get what I consider a better gear ratio.

However, I recently did change out my differential because the old one was severely worn. I should post a picture sometime of just how badly it was worn (and where, so you can all do an inspection).

If you have to get a replacement differential, by all means get one from a 1985 300D with the 2.88:1 gear ratio.

One thing I should advise you about: On my car with the replacement differential, and 15" wheels vs. the stock 14", the trip odometer indicates 9/10ths of a mile for every mile on the interstate. So the speedometer presumably has a 10% under-indication error.

Keep the gear oil changed!

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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  #5  
Old 06-25-2003, 10:06 PM
Sparc
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labor intensive?

I have changed my axle shafts on the car...the diff is just the center unit that is only bolted with like 4 bolts in the rear and a few on top..that and removing the axles again..is there something i am missing?..let me know....I drive on an interstate that is 75mph...just wanted to get the rpms down a bit....thats for your replies
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  #6  
Old 06-26-2003, 12:02 AM
Registered User
 
Join Date: Apr 2003
Posts: 345
diff swap

a) go for a 126 body diff with a 2.88 ratio (anything from 1982 -85)
b) piece of cake, 15 min to remove each side axle stub, 40 min or so to remove the center pumpkin (already drained if you got the C-clip off) and another 3 hrs to batten the hatches and fill fluid

GO for it !!!!
email if you're stuck....

pps- If you cannnot get the fill plug (14 mm hex socket) off before you drain the diff, stop and DO not proceed !!!!!!!
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  #7  
Old 06-26-2003, 08:52 PM
Sparc
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Now i find out i do have the 3.07...this might not be that big of ratio change per cost...any comments on that?...3.07 to a 2.88..hmm....that might only be 200 rpm change...I am just concerned about driving this car at 75 mph for long trips..seems like it would be better to drop the rpm to 2800 - 3000 range..let me know what you guys think..thanks for your replies
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  #8  
Old 06-27-2003, 05:37 PM
Potomac German Auto
 
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407
All of the 1985 (W123 & W126) turbo diesel have a 2.88:1 ratio, b/c they are equipped w/ ABS.
__________________
1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."
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  #9  
Old 06-28-2003, 09:44 AM
Registered User
 
Join Date: Oct 2002
Location: Toronto, Canada
Posts: 700
diff swap

I just swapped my differential not too long ago. I was doing it alone and it took me about a day. The hardest part is getting the new pot into place. I didn't have any means of holding it up there except my dad helping me as I try to bolt it. That thing gets real havey real quick. The axel shafts are just a lot of playing around with a ratchet. Make sure you have a good 12 point bit for the bolts. The bolts tend to strip the bits much quicker then the bit the bolts.

It's a real fun DIY, just take your time and do everything as the manual says since those parts are kind of important.

Clean everything when you get the old pot out and make sure to oil the bolts before reinstalling them. Use threadlock if you are reusing the old bolts, or get new ones.

xp
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1985 190E 2.3L - a constant project.
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  #10  
Old 06-28-2003, 11:16 AM
Sparc
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Posts: n/a
bottomline

Guess what I really need to know now is the change from a 3.07 to 2.88 really worth it....will that make cruising at 75 mph better?..as in engine stress / mpg.... I did some math and it seems it would be around 5 mph difference @ 70 mph.... anyone that has did that exchange have any insight ?..thanks again for all the replies..
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  #11  
Old 06-29-2003, 02:17 AM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
seems like a lot of hassle for small gain and you will loose some aceleration. Can't imagine that crusing at 75 or more will do any kind of damage to a well maintained engine ,don't forget to let turbo spool down after long runs.........
William Rogers........
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