C-6 problem again
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Senior User
Joined: Dec 2004
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From: Knoxville, Tn
C-6 problem again
Well, my 1987 F-350 Dually 6.9 C-6 with banks turbo and over/underdrive lost reverse,again. I had it rebuilt with all high quailty parts as specified per this forum, but it gave out yesterday. Any ideas? I was backing with a load, but I thought this trans was tough? My truck is a 2-wheel drive, do I need a 4-WD??
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Senior User
Joined: Dec 2004
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From: Knoxville, Tn
Very reputible trans shop in Knoxville, Tn. It seemed to work in reverse fine but it did go into gear slow when first starting? Fluid level was fine and didn't smell or look burnt. I am thinking that I shoutn't have backed up with the load? I think I need 4X4?
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Do you have 1st gear? if you do the low reverse cluthc pack is not the issue. The valve body is the issue. The low reverse plunger pin in the valve body is known to oval and bypass fluid pressure giving a no reverse symptom.
Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
I'm leaning towards a valve body issue as well. I'm fighting similar problems with my E4OD at the moment. It doesn't take much to cause problems in the valve body. Worst case scenario, the valve body has to be replaced (tranny can stay in the truck for this job).
I don't think its going to be a big deal to fix. But no matter what is wrong with it, your transmission builder should be made aware about this problem if its still under warranty.
I don't think its going to be a big deal to fix. But no matter what is wrong with it, your transmission builder should be made aware about this problem if its still under warranty.
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From: halstead,Ks
You will still have 1st gear if the low reverse clutch is not working what You wont have is engine braking in manual low or 1st. Put it in low-1st bring the truck up to a speed in 1st and let off the throttle if You have engine braking the clutch is working and You have an issue in the vale body. If it just coast the low reverse clutch is not working.
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From: Knoxville, Tn
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From: Knoxville, Tn
Dave I know nothing is perfect, I'm probably to blam by backing with a load! I found a 1989 F-350 extended cab 7.3 with banks turbo and a 5-SPD, would that be better than what I have now? They are asking $3900 for it, it has arround 200,000 on truck but motor was rebuilt 40,000 miles ago and the banks turbo was added then.
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You will still have 1st gear if the low reverse clutch is not working what You wont have is engine braking in manual low or 1st. Put it in low-1st bring the truck up to a speed in 1st and let off the throttle if You have engine braking the clutch is working and You have an issue in the vale body. If it just coast the low reverse clutch is not working.
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From: halstead,Ks
Your not going to hurt a C6 by just backing a load up they are tough. They did make some light duty C6's for 302s and 400s. The parts in the diesel C6 are the good stuff.
Make sure You have engine braking in 1st and We'll go from there.
Make sure You have engine braking in 1st and We'll go from there.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Dave I know nothing is perfect, I'm probably to blam by backing with a load! I found a 1989 F-350 extended cab 7.3 with banks turbo and a 5-SPD, would that be better than what I have now? They are asking $3900 for it, it has arround 200,000 on truck but motor was rebuilt 40,000 miles ago and the banks turbo was added then.
Backing up with a load will not kill a C6. I have 3.08 gears and I went to the floor at complete stall trying to push a trailer up hill and over a bump once. Never even a hiccup and it never failed me right up to the day I put the E4OD in.
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From: Knoxville, Tn
Back again. When I put it into park it make a strang sound like something being stuck into a fan blade? I hope I didn't screw it up by back a load, I do work it pretty hard though. I think it has been less than 2 years since rebuild, I'll have toi find paperwork and i will give the trans shop a call and see what they say after they check it if you guys think that is smart? How hard would it be to make it a 4X4? Gota go church, I'll be back later !
