C6 internal differences?
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,988
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From: Travelers Rest SC
C6 internal differences?
I've got two C6 apart on the bench, the one from my '72 F-250, and a later one (80's) with a small block bell housing. I'm rebuilding the small block one because I'm going with a 300 six. In the newer tranny, there's a needle bearing for #9. Did Ford ever make this upgrade, or did someone change it along the way? Secondly, on the older tranny, the reverse planetary gear has four gears instead of three. Is that a better, heavy-duty set-up? The older tranny is out of a Camper Special with an 8100# GVW, so I'm thinking it was built a little stronger. Should I use the 4 gear planetary in my build? And I assume it would be better to use the matching sun gear, as they've been run together as opposed to mixing and matching.
Logistics Pro
Joined: May 2015
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From: Tri Cities, TN
I don't know when or if Ford started putting the #9 needle bearing in C6's but it was available from Ford in the early 90's. Your trans may be newer than you think. Look at the reverse ring gear hub if it has the notches for a thrust washer it's a sure bet someone added the bearing unless they used the kit I posted in your other thread. I have a 1988 small block C6 apart right now and it had the #9 thrust washer. The 4 pinion planets are stronger but behind an I6 the three pinion is plenty strong.
Maybe you can help me out here. How many frictions and steels were in the low/reverse clutch in your small block C6? The one I have only has 4 each and I'm scratching my head trying to figure out if it is even possible to put 5 each in there without machining the pressure plate down to nothing or have another snap ring groove cut in the case.
Maybe you can help me out here. How many frictions and steels were in the low/reverse clutch in your small block C6? The one I have only has 4 each and I'm scratching my head trying to figure out if it is even possible to put 5 each in there without machining the pressure plate down to nothing or have another snap ring groove cut in the case.
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Fleet Mechanic
Joined: Jul 2004
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From: Travelers Rest SC
I haven't taken the clutches apart yet, but I'll take a look. I thought in order to have more clutches, they put in thinner ones. I'm brand new at this, so I really don't know.
Logistics Pro
Joined: May 2015
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From: Tri Cities, TN
All the old stuff from the 60's and 70's just used a thicker pressure plate around .760 thick in the 4 friction low/reverse. All you had to do to add another friction and steel was use the ..40 thick plate. Not so in this 1988 trans it has 4 frictions and uses the .4 inch plate.
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Fleet Mechanic
Joined: Jul 2004
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From: Travelers Rest SC
I checked yesterday, and both trannies I have apart have 5 frictions for low/reverse. I can mike the various parts if you want to know how thick they are. I have no way of knowing if they're original equipment, though. The newer unit I have with the #9 needle bearing does have the notches for a thrust washer, so I assume someone added it. The inner race is thinner, like the ones in the kits.
Logistics Pro
Joined: May 2015
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From: Tri Cities, TN
Dose the pressure plate in your small block transmission look like the one on the left or the one on the right? The one on the left I cut down in my lathe and is .270 thick on the edge which allows 5 frictions with .055 clearance. The one on the right is stock .4 thick. I guess I need to drag out an old case that had 5 frictions and measure where the snap ring groove is compared to this 1988 case.
Last edited by Crop Duster; Oct 13, 2021 at 01:02 PM. Reason: forgot the pic
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Cross-Country
Joined: Jul 2021
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From: Here, there, and everywhe
Use the 4 pinion planet. I divides the load by 4 instead of 3 making them last longer.
Don't know what the #9 bearing is. However, around the middle 70s Ford changed the area around the forward drum to accomodate a caged sealed thrust bearing to replace the early 3-piece thrust bearing. If you try mixing and matching those parts you can't get your endplay correct.
Don't know what the #9 bearing is. However, around the middle 70s Ford changed the area around the forward drum to accomodate a caged sealed thrust bearing to replace the early 3-piece thrust bearing. If you try mixing and matching those parts you can't get your endplay correct.
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