C6 slippin
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Freshman User
Joined: Sep 2001
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C6 slippin
To start I have A 78 f100, 320 horse 302. I have had my trans rebuilt twice by a friend. Each time when I got it back it would really slip bad when going from second to third. It also slips bad in reverse. I have a 2600 rpm converter in it so that could possibly be the slipping in reverse, I dont know. It has a b&m transpack kit with the street/strip option. I also have a c6 off of a 390 for parts. The first to second shift is not hard when it shifts unless I take my foot off of the pedal. I really want hard shifts even when I have my foot all the way too the floorboard! Do I need to get a 2-3 super servo? I recently bought a Fairbanks trans action kit but have not put it in. I do almost all of the work on my truck but I know nothing 'bout transmissions so I am going to have a pro do it this time!
By the way, if it helps, it doesnt slip after it gets into third it only slips when it shifts.
Also I had to modify my kickdown rod. My carb sits about 2" higher than stock so I cut the kickdown rod and lengthened it 2".
One last thing, I manually shift it because If I stick it in drive it shifts realy fast. Thanks for any help
Matt
By the way, if it helps, it doesnt slip after it gets into third it only slips when it shifts.
Also I had to modify my kickdown rod. My carb sits about 2" higher than stock so I cut the kickdown rod and lengthened it 2".
One last thing, I manually shift it because If I stick it in drive it shifts realy fast. Thanks for any help
Matt
Elder User
Joined: Jun 1999
Posts: 940
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From: LAT 46.55501° & LON -122
C6 slippin
I am guessing that the problem is with the Reverse-High clutch. Either the seals on the piston are leaking or the clutch plates are worn out and slipping. If you find out that there are only 3 friction disks in the pack, you can have your drum machined for a second snap-ring groove to allow for 5. This will give you more torque capacity, longer life, and harder 2-3 shift.
The servo only affects the holding power of the intermediate band which gives 2nd gear. Therefore, goung to a high performance servo piston will only make the 1-2 up shift and 3-2 down shift harder. It will have little affect on 2-3 upshift.
If the torque converter was failing, it would have an affect on all gears.
The servo only affects the holding power of the intermediate band which gives 2nd gear. Therefore, goung to a high performance servo piston will only make the 1-2 up shift and 3-2 down shift harder. It will have little affect on 2-3 upshift.
If the torque converter was failing, it would have an affect on all gears.
Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
C6 slippin
I think one problem you may have is the kickdown rod adjustment and maybe even it's geometry. If it isn't functioning you would get early shifts, at least the 2/3 one.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
