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Old 08-07-2006, 02:34 PM
Join Date: Dec 2004
Location: Barkhamsted CT
Posts: 12
Trans swap

Iíve done a search, and have a good handle on this, but any last advice before I start yanking is always appreciated. Iím looking to replace the transmission from my í85 300D with the trans out of my í79 300 parts car. Torque converters the same? Can I leave the one on the 85 intact and just change the trans? That would make life a lot easier. There is nothing wrong with the trans in the 85, except the fact that it is out of an SD, which of course has an electric speedometer and mine is cable operated. I go to work between 1 and 4 AM and I have to drive through three little towns here in Northwestern CT and their police force has nothing to do in the middle of the night other than shoot radar and gather ticket fine cash. So not having a speedo really freaks me out. I bought this cobbled up mess of a car (my 85) and Iíve been fixing thing slowly for almost a year.

Kudos to all the people on the forum and thanks because all of you have been so helpful, most of the times not even being ware that a post or comment can help out.



87 190 2.5 TURBO! 321,000 needs help
85 300 123 waiting for the day-----
79 300 123 this side of junk
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Old 08-07-2006, 02:38 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,800
You're going to put a non-turbo transmission behind your turbo engine? I think you're better off with a dead speedo.

Even if you can pull a tranny with the torque converter bolted to the engine there is significant risk in installing a tranny with the torque converter bolted to the engine. I don't think you can align it and you risk damaging the input shaft and front seal.

... stay tuned
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Old 08-07-2006, 02:40 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,800
Mark the tach in 4th gear mph.

... stay tuned
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Old 08-07-2006, 02:42 PM
Admiral-Third World Fleet
Join Date: Feb 2002
Location: Central FL
Posts: 3,068
I think you are better off with what you have. The '79 300 is likely to be a 4-bolt oil pan 722.1xx whereas you have a 6-bolt 722.3xx now. I do not think the TC's are the same- I think the one on the 722.1xx tranny has much more slender "fingers" (more likely to break, IMO- check the EPC). Perhaps you can find the back end from a 300D tranny that has the mechanical output and put that on yours- maybe even under the car (?)


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 (??)
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