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  #1  
Old 08-11-2005, 04:23 PM
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126 rear dif question

Hi all I am thinking of installing a rear diferential from an 84 126 gasser in my 81 300sd.Dose anyone know how this would effect performance?both axles are shot on the sd and the gasser rear package just happened to be available.

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  #2  
Old 08-11-2005, 04:43 PM
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You need to look at the differential ratios...

ALso are those the same size diffs? 1.3 liter?

I'd grab the used axles and spend 3-4 hrs installing them.


Michael
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  #3  
Old 08-11-2005, 09:35 PM
t walgamuth's Avatar
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the 126 gasser

if v8 is prob a 2.47. if a six it is prob a 3 something. is the sd a 126 bodie? if so it shold be a 2.65. if you get the info i will look up the stuff for sure. year and model, please.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #4  
Old 08-11-2005, 09:48 PM
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i just checked my book

the 126 bodied 280 is not listed in my book but a 116 bodied 280 is a 3.69 gear. i am guessing that the newer one is a higher ratio such as 3.46 or so.

hope this helps a little.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 08-11-2005, 10:00 PM
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Here is the information you seek...
Well - I have found the MB diesel "easter egg"
Please use the search feature next time - this has been discussed many times.
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  #6  
Old 08-11-2005, 11:53 PM
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Quote:
Originally Posted by t walgamuth
if v8 is prob a 2.47. if a six it is prob a 3 something. is the sd a 126 bodie? if so it shold be a 2.65. if you get the info i will look up the stuff for sure. year and model, please.

tom w


Aren't SDLs equipped with a 2.65:1 axle?
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I'm not a doctor, but I'll have a look.

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  #7  
Old 08-12-2005, 01:51 AM
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Quote:
Originally Posted by Hit Man X
Aren't SDLs equipped with a 2.65:1 axle?
The SD's have a 3.07 up to 1984. In 1985 it was reduced to a 2.88.

All the SDL's have a 2.88.
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  #8  
Old 08-12-2005, 02:42 AM
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thanks for all the info you guys.the gasser is a 126 '500 series sdl the diesel is an 81 sd. I am going to see about pulling those axles tomarrow.was someone saying something about axle ratios or were you talking about dif gear ratios? also I do attempt to use the search thingy my skills seem to be inadiquit I will keep trying though ............thanks...........john
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  #9  
Old 08-12-2005, 07:46 AM
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i think

i have seen in one of my books that some of the 86 and 87 sd's have the 2.65.

back to the original poster. the 500 should be a 2,47 gear ratio in the rear diff. the sd should be as brian said a 3.07. the 2.47 has been used in the diesel by some folks that post on this website. they were very happy with it. it will reduce your ability to get the car going by making the gear ratio have less mechanical advantage. the trade off will be that the motor will turn a lower rpm at highway speeds and be quiter and get better economy. if you change the rear end you should also change the speedo so it will read accurately. everything as far as i know will interchange wo modifications.

good luck. it is a job.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #10  
Old 08-12-2005, 11:49 AM
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Quote:
Originally Posted by t walgamuth
i have seen in one of my books that some of the 86 and 87 sd's have the 2.65.
There were no SD's in the years 1986 and 1987.

Better check that book.
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  #11  
Old 08-12-2005, 07:10 PM
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well I pulled the axle from the 500sel,fast lane lists the same part number for the 81sd but I noticed a big plastic clamp on the axle boot nearest the diffon the sel,this isnt on the sd axle .Do you think this is a problem?.thanks........john.

Last edited by shadetreetech; 08-12-2005 at 07:17 PM.
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  #12  
Old 08-12-2005, 08:00 PM
t walgamuth's Avatar
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brian

well, that could be the problem.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #13  
Old 08-12-2005, 08:23 PM
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Quote:
Originally Posted by t walgamuth
well, that could be the problem.

tom w
I believe you are looking at the '87 300D. It has a 2.65 ratio.
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  #14  
Old 08-13-2005, 12:16 AM
t walgamuth's Avatar
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yeah

i guess so.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #15  
Old 08-13-2005, 01:10 AM
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well, brian

my mercedes factory service manual shows sd's for 86 and 87. are you saying that there only were sdl's? if so the axle ratios are the same are they not?

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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