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#1
12-24-2012, 10:27 AM
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putting 722.3xxx trans from 126 to 123 and vice/versa
ok... we've all heard that you can swap the trans by trading tail covers, and the speedo drive assembly...
not exactly...   see that little plastic tube that is connected to an oil feed line towards the bottom of the tail cone?  this is what the 126 tail cone looks like (yeah i know... grody trans!!!) notice that not only is there no plastic tube, there is no place to put one. SO... me thinks that you can make a 123 trans work in a 126, because the 126 does not need the oil for the speedo... but you'd likely have to plug the hole for the oil feed... but there is no way to make it work the other way... it looks like the 123 NEEDS the lubrication to the speedo gears... without it the plastic would likely fail rapidly.  all the bolts removed from the tail cover.  a NICE shiny new lock nut!  a 123 parking pawl. notice the shims on the shaft... don't mix them up!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! 
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#2
12-24-2012, 11:17 AM
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I tried that once, and it did not seem to work. I tried to put an '85 300D trans in an '81 126. If I remember correctly, the tail cone mounting flange was totally different (bolt holed not lined up). The car still does not have a working speedo to this day. I was going to hook up the speed sensor like mach4 did on his 300SL-D project, but the guy that bought the car did not care if the speedo did not work.
[edit] I just looked at the thread title and realized that you are talking the same model trans in 2 different chassis'. I think the '85 was a 722.4, and the '81 was a 722.3. That might have been the difference.
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 All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html
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#3
12-24-2012, 11:33 AM
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Good bit of myth busting there John. Also confirmed by DeliveryValve over on BenzWorld =>
W126 transmission in a W123 - Page 2 - Benzworld.org - Mercedes-Benz Discussion Forum
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#4
12-24-2012, 12:10 PM
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Glad someone else has found this to be a myth.
A few months back, I was ready to have a w126 trans delivered, for me to change over the tailshaft housing and use it in my w123 300td. I happened to call my local indy manager to jaw about it, just prior. He was really skeptical, but I told him we had folks on this list who claimed it had been done. While we were chatting, he pulled up the parts diagrams on both and said "no way that will work." He emailed them to me and I had to agree.
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 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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