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Very nice looking car you got there! Congrats and well researched!

No way mine's ending up this way!! http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=151360011992&ssPageName=ADME:B:SS:AU:3160

At a guess I'd say the mods of MB 5sp, ECU, GV OD, custom bellhousing and driveshaft, plus Quaif diff would not leave any change from $14K! Ouch! :eek:

Here's the link but no word on ratios: http://shop.quaife.co.uk/quaife-mercedes-limited-slip-diff-kit-for-sel-class-116-450-se-450-sel

What diff ratios do Quaife offer?

Yes but how much would that all cost by the time you get the trans, overhaul it, buy a GV, modify it to fit (at both ends), plus buy an ECU?

The only question with that config is what final drive to use....

Personally I like the idea of this one: Torqueflite 48RE 2.45 1.45 1.00 0.69 na na na 2.21 610+Nm Just add a GV for an 8 speed trans!!

Going by the ratios a 6.3 would rev even higher than a 6.9 at 100kmh. What's your 6.9 doing (RPM) at 100kmh Motec?

I just had to post all that to include all the detail I could. There's no way I'd go back to a 6.3 box for a 6.9... The only problem with GV is weight and fitting it into the tunnel. That's why a all-in-one box is a better option if one can be found that will work without major headaches and cost

Here's a transmission comparison chart I prepared earlier in Excel but I can't work out how to post the file so here's just a copy/paste: 1 2 3 4 5 6 7 R Torque Rating Diff Ratio 6.3 3.98 2.46 1.58 1.00 na na na 500Nm 2.85 6.9 2.31 1.46 1.00 na na na na 500Nm...

Description of Operation, Auto Trans 722.3 (W4A040) dated 11/85. I wonder if the trans type is stamped, or cast anywhere on the housing? The 40 does indicate Max input torque in Nm, as mentioned earlier in this thread by ctmaher. The ratios are: 1st 3.68 2nd 2.41 3rd 1.44 4th 1 Reverse 5.14 I...

Regarding the 6.3 diff: 2.82:1 or 2.85:1, depending on the exact generation.

With a lower 1st gear and final drive, plus a lighter weight, it's obvious why the 6.3 is quicker. Mark Be careful with changing rear axle ratios. I had a customer here with a Euro 6.9 that was bored out to a 7.3, custom pistons, etc... Anyway, it also had a 3.07:1 rear axle ratio in it and...

Well the goal isn't complex, but the solution certainly is! I want better acceleration than the 6.3 (and many other cars on the road)! Changing the final drive (diff) alone would go a long way towards that goal, but it would also reduce the top speed. I then got thinking about the...

Ratio's 6.3 versus 6.9: 6.3 I 1 : 3.98 II 1 : 2.46 III: 1 : 1.58 IV: 1 : 1.00 6.9 I 1 : 2.31 II 1 : 1.46 III 1 : 1.00

From the same site regarding a 1986 560SEL: 1th gear ratio: 3,87:1 2th gear ratio: 2,25:1 3th gear ratio: 1,44:1 4th gear ratio: 1,00:1 Reverse gear ratio: 5,59:1 Gear Ratio (end): 2,65:1 RPM at 120 km/h (theoretical): 2.550 rpm

Could we have accidently discovered why the stator splines fail?? Or did they grossly understate the input limits? BTW I found another site that said the 600SEL used the 722.621 trans but it's likely there's a lot of inaccurate info out there. A different site gave these ratio figures for the...

Ok here's some info that I've copied from another site where I discussed a transmission upgrade: Mark, 560SEL got the 722.323 and the 420 got a 722.324. It appears the 722.3 transmissions used behind the V8 cars were W4A-040 units, with 040 being the torque rating in mkg. The V12 cars had a...

Here's the link to the other thread but it's not quite what I was looking for: http://www.topklasse.org/forums/showthread.php?t=3034&highlight=transmission+conversion