Transmission for a 93 300D 2.5 turbo - PeachParts Mercedes-Benz Forum

oldblue85 · #1 08-03-2010, 06:24 PM

I'm considering purchasing a 93 300d 2.5 turbo. My concern is that the tranny has a bad reverse. Takes a few seconds to engage and then slips badly for a second until engages and chirps the tires. Don't know much, but know that can't be good. A friend has a good 722.414 that came from a 89 201. He believes it is a suitable replacement for the tranny in the 93. Can anyone tell me if this is so?

Thanks for all your help.

mbdoc · #2 08-04-2010, 08:09 AM

Yes, that trans will fit & work.

However the shift points will be off due to the differences in the governor operation.

oldblue85 · #3 08-05-2010, 12:02 AM

Thanks for sharing your knowledge on this subject. Would this shift point change be noticable or effect the drivability?

babymog · #4 08-05-2010, 12:41 PM

It might, if the (gas engine transmission) shift points are above the governed max. rpm of your diesel.

If the valve body and torque converter in your old transmission are good, you might consider putting them into the swap trans.

oldblue85 · #5 08-07-2010, 12:10 AM

You guys are great! I appreciate the advice.

I'm still concerned about using the 722.4. I've read that the 722.4 was only used in the 190's and my friend says that this one did come from a 89 190 with a 2.5 turbo. The same motor that's in my 93 300d 2.5turbo. Does anyone know if it's true the 300d 2.5's only came with the 722.3. and if so, do you think the 722.4 would hold up over time in it's place. We don't know how many miles were on the 89 190, only that it was shifting fine with no apparent leaks. I figure the cost for purchase and swapping out the two at app. $600 compared to a rebuilt of my 722.3 at a cost of $1200 to $1500 by a local shop with a great rep. The car has 125k on it and I plan to keep it, but like everyone else don't to spend money I don't need to.

I've considered rebuilding the 722.3 myself with the help of a another good friend who has built a number of gm automatic trannys. I'm sure there are significant differences, but do you think the ATSG manual would be enough to get us through this. I've priced the kits from $250 to $500.

Sorry for all the rambling, just trying to get my head around all the issues.

thanks

layback40 · #6 08-07-2010, 03:49 AM

Do yourself a favor, put the other trans in, spend a couple of weekends rebuilding your old trans & keep it. One day, in about 200k miles when the other fails you will be ready for it.

compress ignite · #7 08-07-2010, 03:50 AM

Your 124.128 300D CAME from Sendelfingen with a 722.418 Transmission.
Reverse difficulties CAN be symptomatic of a DECLINE.

FIRST...Have you "Serviced the Transmission", NEW Filter AND drained and refilled BOTH the Pan and Torque converter?

Howeveah, The 722.3XX series Tranny is THE upgrade
(You'll blow your 2.5 up developing power ,before you hurt a 722.3XX)

member ps2cho has recently rebuilt his 722.3XX and all the details are here:
722.3 transmission removal

The ATSG is a good starter.

(SOME old hands believe both the .3 and .4 were originally GM designs,purchased by Mercedes,in days of Yore.)

oldblue85 · #8 08-07-2010, 09:31 PM

I just purchased the auto and the previous owner told me that he had just had the fluid and filter changed. Don't know about the tourqe converter. Said dextron was used. It does look to me that there is too much fluid in the trannie. I checked and it was clean, no discoloration but I'd guess maybe a quart too much fluid when hot. Can too much fluid cause this? He told me that reverse was acting up before the fluid change...

compress ignite · #9 08-11-2010, 04:11 PM

Not a happy result!

Try removing a quart(AND then follow the factory fluid level check)
[1. Check when fluid is "Warm" , 20 mins driving at least...NOT WOT!
2. Check on LEVEL ground
3. Move the shift selection lever through all the gears and then back to Park
Then check the ATF level.
4. DO NOT use Cloth or Paper to wipe off the dipstick.Leather only
(Lint or paper fluff can obstruct the tiny passages in the valve body!!!) ]

It may be time for the internals of the .4 to be inspected.
('Thing is, if you're "In There" why not replace everything?)

babymog · #10 08-11-2010, 04:23 PM

I respect your view on this, and the FSM, but isn't the pan pre-filter? Won't the fluid be filtered before getting into the valve body to prevent any paper fluff, ...

A big concern with paper towels is that there are metal particles in them from the production process BTW.

tbomachines · #11 08-11-2010, 04:45 PM

Does the 300D transmission have a B3 adjustment screw? I know some of the trannies have them-- while it isn't a total solution to a worn transmission, tightening the B3 band screw will shorten the lag time when reversing IIRC.

ps2cho · #12 08-11-2010, 06:48 PM

Quote:

Originally Posted by tbomachines

Does the 300D transmission have a B3 adjustment screw? I know some of the trannies have them-- while it isn't a total solution to a worn transmission, tightening the B3 band screw will shorten the lag time when reversing IIRC.

The 722.3/4 do not have this ability unfortunately.