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#1
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Overdrive for the 123 series?
Since the 123 5 speeds are hard to come by... I wondered if anyone has thought about adapting a Borg warner overdrive to their benz?
I used to have 60 willys Jeep wagon with a Borg Warner ( studebaker) overdrive adapted to the transfer case. ( see pic) I was at a car show lst year and saw the same overdrive adapted to the rear differential making it a clean easy install rather than at the rear of the trans. I'm wondering if there is enough room for an overdrive mated to the rear output flange? Anyone think I'm nuts?
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81' 240d 4 spd 140k on the clock |
#2
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I think
It's a pretty good idea, but where to find one of these overdrive units is going to be problem #1. There are other possibilities like a Ranger OD, I think?
BB
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For Sale: 1982 MB 300TD 1995 Chevrolet Suburban 6.5TD Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel |
#3
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I still have the jeep one and I found another at a Trans shop .
Still wondering if I have the room or would it be easier to adapt latemodel Chevy car 5 speed to a benz bellhousing? the input shaft diameters and spline fits a Mercedes clutch disc and pilot bushing perfect. I got pics if any wants. A trans adapter and a custom pilot bushing(longer) to make up the space for the adapter would be pretty easy. Just thinkin out loud again
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81' 240d 4 spd 140k on the clock |
#4
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Just make sure the engine does not drop below its peak torque level or the engine may bog down on the highway.
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1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair |
#5
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I've seen quite a few OD units installed on 80's Volvos. They should not be hard to come ny.
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#6
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Overdrive would be absolutely kickass.
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1985 CA 300D Turbo , 213K mi |
#7
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Quote:
Laycock de Normanville OD
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Never a dull moment at Berry Hill Farm. |
#8
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Laycock Overdrive-
I have 3 of these units- one installed on my TR-4a and one on the Spitfire- and one on the shelf that I rebuilt years ago ready to be plopped on a Triumph tranny I also rebuilt years ago. The Spitfire unit (type A) is smaller than the TR4 unit (type D) and the one's you see in the later Volvos are type J's. They are kickass on the Britcars and make them fun to drive at speed. The problem with all of these is that you would need a longer mainshaft in your transmission. Anyone know where to get one of those for a Mercedes?
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) Last edited by rs899; 03-09-2006 at 11:58 AM. |
#9
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anyone consider gear vendors overdrive units... http://www.gearvendors.com/ not cheap but they splice in between the trans and the rear differential.....
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#10
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Quote:
On a side note if you're axle gearing is higher(numerically lower) than say 3.30:1 or so you'll never get any use out of it. You'll be too low in the power band of the motor so you'll either be lugging it or shifting out of OD constantly. If your gearing is in the 3.60 range as I think the 240D's w/5 speeds were you'll be fine. |
#11
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Quote:
I am familiar with the Saturn overdrive. The Borg Warner Unit was made many years before Warn or Saturn came online. http://www.vernco.com/51wagon/id58.htm I never implied the BW was made by Warn either...and no the Saturn would not be worth adapting. The BW units I have seen used came from a studabaker vehicles( Saginaw perhaps) and mounted factory behind many of the factory 3 speed transmissions. http://www.classictruckshop.com/clubs/earlyburbs/projects/t85n/rebuild.htm Mine was removed and adapter plate made to fit the trans case. I cannot see how a Saturn could ever be used in anything other than a dana spice T-case. However my suggestion was to mate the BW overdrive to the rear pinion and shorten the driveline. It would give you approx 15% overdrive IIRC. My car love to cruise at 60 mph so with a overdrive I could be right at 70mph at the same RPM
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81' 240d 4 spd 140k on the clock Last edited by bennett; 03-09-2006 at 02:48 PM. |
#12
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Bennet,
What late model Chevy 5 speed trans are you using? Borg Warner T5? That would be a really neat conversion. You say the clutch fits the input shaft? What about adapting a MB bellhousing to the T5 instead of the adaptor plate? RT
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When all else fails, vote from the rooftops! 84' Mercedes Benz 300D Anthracite/black, 171K 03' Volkswagen Jetta TDI blue/black, 93K 93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K |
#13
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Quote:
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81' 240d 4 spd 140k on the clock |
#14
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i am aware
of the studebaker ods and the volvo ods and have wondered on occasion if they are similar enough to perhaps interchange. they look a lot alike from pictures i have seen.
i had a gear vendor unit on my 85 ford one ton van with 6.9 diesel. i suspect it would be too large to fit on the front of the diff or any place else on a benz without floor pan surgery. it is a neat unit though. 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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