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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 m46 to m90 conversionViews : 2215 Replies : 51Users Viewing This Thread : |
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May 30th, 2020, 22:41 | #1 |
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940 m46 to m90 conversion
Hello all
I have two 940s. One is a scuffy, off-the-road 1995 940 2.3 LPT with an M90 box. The other is much cleaner, a 1991 940 2.3 HPT with an M46 box. I want to put the m90 in the HPT. Do I need to swap the rear axles too i.e do the final drive ratios differ between the two? |
May 30th, 2020, 22:54 | #2 |
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No need to swap axles.
You will need a clutch to fit the M90 as I doubt you will also want to transplant the tired out DMF |
May 30th, 2020, 23:06 | #3 |
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Whoa that's a relief. I gather retaining the M46's solid dog-dish flywheel is the best thing. Is there a definitive list of clutch and flywheels parts available for this conversion. Pressure plate, clutch disc etc? I gather the 20 vs 22 spline count of the M90 vs the M46 is the principle stumbling block.
Both cars are currently alongside one another and complete. Presumably the HPT' M46 flywheel can stay put, but I need to use a new 940TDi cover and 228mm pressure plate to mate the M90 gearbox? |
May 30th, 2020, 23:14 | #4 | |
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May 31st, 2020, 09:58 | #5 |
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Yes that clutch will just bolt in. It is for M90's using the dished flywheel you have
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May 31st, 2020, 10:53 | #6 |
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Ah ok. And just to be sure, the axle is fine to leave, ie the speedometer reading will still be correct with the different box? I know the m90 equipped cars have their speedometer sensor run off the back of the diff, whereas I thought m46 was cable driven?
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May 31st, 2020, 17:28 | #7 |
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all 900 series are driven off the axle.
some very early 700 series might be cable |
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