clutch swap

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11-19-2013, 05:46 PM

stonemaster

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clutch swap

flywheel in my 87 F-250 shot, of course i cant find a new one so my mechanic thinks we may be able to put one from a 7.3 into it, same number teeth on flywheel but .... is this do-able ????

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11-19-2013, 07:10 PM

hairyboxnoogle

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Not recommended, the 6.9 and 7.3 have a different external balance. Might look a single mass flywheel kit and use the older fly

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11-19-2013, 07:31 PM

stonemaster

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old fly is the problem, and yes the single mass kit is what we're doing, thanx for the info

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11-21-2013, 01:13 AM

stonemaster

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well it worked. 88 7.3 kit in 87 6.9 my wrench has has been doing Ford trucks for around 50 years, and a damn good friend at that, back on the road

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11-21-2013, 08:43 PM

airdale94

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Sorry I missed the specifics of your post the first time I read it the other day. Supposedly the (87 only) 6.9. and the 7.3 IDI flywheels are one and the same.

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11-22-2013, 03:17 PM

Aune163rd

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They in fact are the same flywheel....for THAT year only.

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11-23-2013, 01:35 AM

stonemaster

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ok I'm a little confused (what else is new)was swapping the entire clutch does with and 88 7.3 a problem because so far, (about 40 miles) is hasnt been one ???

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11-23-2013, 05:00 PM

airdale94

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It is confusing. I think what it is. The 87 is a single mass. Drilled for the 7.3 clutch. Not sure when the 7.3 went to the dual mass.

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11-23-2013, 05:17 PM

stonemaster

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I'll find out, this could be helpful for some other members, my guy will know

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#10

11-24-2013, 08:49 AM

tjc transport

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my 88 had a dual mass piece of crap in it .

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#11

11-24-2013, 09:20 AM

Chevy_Eater

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The '87 is factory dual mass when it had the ZF.

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#12

11-24-2013, 09:25 AM

tjc transport

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yup. if it has a ZF trans it is dual mass. if it has a 4 speed it is single .
but it is very easy to put a single flywheel setup on a ZF trans truck, and commonly done to get away from the problems of the dual mass.

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