84 700r4 reverse input clearence? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-16-2011, 07:29 PM
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84 700r4 reverse input clearence?

I am putting my reverse innput drum together and am unsure of the clearence. My haynes manual say (in a note) that for "1987 and later models, check the reverse input backing plate travel" should be between .040 and .075. However, mine is an 84. the way the note reads you would think you don't even check the clearence at all, before 87. My ATSG book (for 82-86 700r4) doesn't give a clearence (even though it does for the other clutch packs) If i stick it together like it shows in the ATSG manual (wavy steel, friction, steel, friction, steel, friction, steel, friction, backing plate) i get .095.
if it matters, this thing is going behind a tired old stock 305 that is putting out well over a dozen horsepower
This is my first rebuild. Thanks in advance for any info. Mark

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Old 09-16-2011, 10:16 PM
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Quote:
Originally Posted by BrokenTruckGuy
I am putting my reverse innput drum together and am unsure of the clearence. My haynes manual say (in a note) that for "1987 and later models, check the reverse input backing plate travel" should be between .040 and .075. However, mine is an 84. the way the note reads you would think you don't even check the clearence at all, before 87. My ATSG book (for 82-86 700r4) doesn't give a clearence (even though it does for the other clutch packs) If i stick it together like it shows in the ATSG manual (wavy steel, friction, steel, friction, steel, friction, steel, friction, backing plate) i get .095.
if it matters, this thing is going behind a tired old stock 305 that is putting out well over a dozen horsepower
This is my first rebuild. Thanks in advance for any info. Mark
sounds like your missing 1 friction and steel but, the steels are anywhere from .070-.078 and the frictions are anywhere from .078-.088 . that is way too much clearance. sometimes what ill do is take 2 frictions and take one side off of each friction and put the metal sides against each other to make a thicker friction to tighten up clearance. or an extra steel can be added at the bottom after the wave plate. .020-.040 is about all you want. i also set my 3-4 clutch clearance @ .015-.025. if i remember right, the atsg book has clearance at about .060.

Last edited by tnsmith10; 09-16-2011 at 10:25 PM.
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Old 09-17-2011, 03:55 AM
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thanks tnsmith, If i put an extra steel in i would be right around 20. rekon i'll do that. Mark
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Old 09-17-2011, 06:55 AM
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There are .090'' steels available.
If you have .095 now and if that's with .078 steels, swapping to .090's would give you .047''.

.020 sounds a little tight.
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Old 09-17-2011, 07:05 AM
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i would measure the frictions if you have not yet... I often hear of kits shipped with wrong thickness reverse input frictions.

just a thought
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Old 09-17-2011, 10:06 PM
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Are your reverse input frictions smooth, or do they have grooves in them? For a '84, they should have grooves and measuse .080". An extra steel is an option. I like putting a steel directly against the wave steel, anyway. If I use an extra steel in an early set up, I usually like to put 1 or 2 late 700 (.070") fristions in it. .020" is a little on the tight side. I'd like to see atleast .030

Frank
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