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Discussion Starter · #1 ·
Anyone done this? Acquiring the bellhousing apparently is 90% of the work involved, since I will be bolting it up to the 3/4-race-prepped B18 already in the car. I am sick of grenading M41 transmissions. I need a cost-effective solution, and although the M47 units aren't exactly cheap, it sure as hell beats laying down $1,100 for rebuilding an M41 each time I break it! <IMG NAME="icon" SRC="http://********************/smile/emthdown.gif" BORDER="0"> <p>-he who stacks pork
 

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Re: M47 installation in 142S (Leopold Porkstacker)

Use an M46 instead because it is more likely to outlast the M47, and it's probably cheaper & easier to find.
 

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Re: M47 installation in 142S (towerymt)

Seriously????? But the weak link still exists in the M46 - the overdrive unit. Once the clutch lining of the planetary drive system within the overdrive unit goes, no power is transmitted to the ground.<p>I've heard 50/50 pro/con comments over the years regarding the use of the M47 transmission, and to this day I still hear the mixed comments. So what exactly is the weak link in the M47? I've heard something about the needle bearing in I believe either 1st or 5th gear going south in passenger cars, and at the same time I remember talking to a guy who used to light up his tires in his turbo 740 all the time and only ever wore out clutches.<p>-he who stacks pork
 

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Re: M47 installation in 142S (Leopold Porkstacker)

lol, please dont put in an M47 there seriously crap!!!!the M46 will out last the 47 by miles.. the M46 can handel power from 250 to 300hp. where as the M47 will take bout 150 200hp. see if you can get an M90 then you can push 450+...hehehe. the M47 have week bearing and they alwasy colaps. then you burn out the clutch then it all goes to poop...but if its just a daily driver then hey the 47 is great cos you dont have to worry bout the overdrive.<p>michael.
 

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Re: M47 installation in 142S (devalmyth)

Get a late M46 with the P-type OD. Or get an M410.<p>I don't know what breaks in the M47, but I do know of one behind a powerful B230FT and it's lasted despite the hard driving. However I know of far more M46 cars that make as much power w/o breaking. One guy in FL is running low 13's with a 2.3 bottom end in a 242T with an old iron case M46.
 

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Discussion Starter · #6 ·
Re: M47 installation in 142S (towerymt)

People tell me I am “hard on equipment”, so that ought to clear up any confusion. When I had the engine in question in my 1963 122SS I had destroyed two M40s and five M41s from “normal” driving and a bit of “spirited driving” in the hills and freeway onramp/offramps/etc. with the occasional autocross. Of course, I had also grenaded several rearends as well as motormounts galore and many many U-joints. So my problem is clear — apparently I “drive like a jackass in a stolen car”, given my lack of luck with mechanical failures.<p>Meanwhile, in the 142S (now can be referred to as the “142SS”), I drift the car through corners daily which is sort of hard on the drivetrain. <p>-he who stacks pork
 
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