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Transmission Rebuild, 6.9

Started by TJ 450, 03 January 2009, 07:56 AM

Big_Richard

there was nothing wrong with the bands - or is this purley research ?

TJ 450

Mainly just for research. The bands are available from the classic center.

I will be replacing every bearing in the trans, as they are reasonably priced.

I have conflicting information regarding the shafts, the dealer says they are available. Tom says they're not.

Tim

1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Big_Richard

Quote from: TJ 450 on 08 January 2009, 10:35 PM
Mainly just for research. The bands are available from the classic center.

I will be replacing every bearing in the trans, as they are reasonably priced.

I have conflicting information regarding the shafts, the dealer says they are available. Tom says they're not.

Tim



that just means dealer only, which means you pay what they ask or else ;)

TJ 450

Certainly, after forking out the $$$$, it will be one awesome transmission. 8)

Tim

1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Big_Richard

Quote from: TJ 450 on 09 January 2009, 04:42 AM
Certainly, after forking out the $$$$, it will be one awesome transmission. 8)

Tim



feckin wanna be fror that amount of coin ;)

thank god my shaft was smooth - thats what she said

WGB

Transmission manual arrived from youessofayy today.

Quite surprised that it is a well printed paper manual with all pictures legible and diagrams perfect.

I will see how it looks digitally when I have enough time.

Bill

TJ 450

Excellent, Bill.  ;) 8)
Very good news and I'm surprised it is a printed manual, a rare sight these days. Digital manuals are very practical, but it sure is nice to have a proper hard copy.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

TJ 450

I picked up a 450 trans from Nathan today. I received some information that the shafts may have been the same, so the plan was to tear this one down to have a look. Here are tonight's discoveries...

The front shaft is identical.
This is half the problem solved. I have a sneaking suspicion that the intermediate shaft makes up the extra length in the case, but we'll see. There's not a chance that it could be this easy, is there?

Trans after cleaning.

Front shaft installed.


Left - 6.9
Right - 450


Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

nathan

you crazy bastard. i like the fact in one of the pics you can see the clock at 1:20...i know it wasnt in the arvo! when TF do you sleep!
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

Big_Richard

Quote from: nathan on 01 February 2009, 06:46 PM
you crazy bastard. i like the fact in one of the pics you can see the clock at 1:20...i know it wasnt in the arvo! when TF do you sleep!

TJ only sleeps once every 7 days, he's constantly buzzing from the high he gets pulling his car to peices ;)

Big_Richard

while it may fit, surprisingly, there is definitly a difference between the 2, 6.9 part number 116 270 10 25 and 4.5 part number 116 270 09 25.

It may just be that the 6.9 part number item was subjected to more scrutiny when going thru quality control. Are all bearing surfaces exactly the same when measured with a caliper.

WGB

Great stuff - keep it up.

It might make me brave enough to attack an auto tranny one day.

Bill

Big_Richard

Quote from: WGB on 01 February 2009, 08:30 PM
Great stuff - keep it up.

It might make me brave enough to attack an auto tranny one day.

Bill

If i could do it, you can do it blindfolded. By far the hardest part of the job is removal and reinstallation of the transmission. Once thats done the rest can be done leasurly sitting at a table.

TJ 450

#28
Quote from: Patrick Bateman on 01 February 2009, 08:04 PM
while it may fit, surprisingly, there is definitly a difference between the 2, 6.9 part number 116 270 10 25 and 4.5 part number 116 270 09 25.

It may just be that the 6.9 part number item was subjected to more scrutiny when going thru quality control. Are all bearing surfaces exactly the same when measured with a caliper.
Now that it's not 3:00am, I have noticed a difference. ;)
If you have a close look at the full-sized pic, at the base of the shafts is a shoulder where the front bearing resides. On the 6.9, the shoulder is chamfered, on the 4.5 unit it is square. Everything else is the same. I would imagine that the chamfered shoulder would give it more strength.

Here's a pic of the clutch packs of the 4.5 trans. This trans has had a pretty hard life even though it is low km. Look at the burn marks and the deformed plastic.


Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Big_Richard

Considering that shaft is the best part of 2 grand, id be personally building a mongrel hybrid to use the 450 shaft and bearing. Considering the amount your probably never going to drive the car, im sure it will last the life of the car ;)