C6 Tranny Question
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Junior User
Joined: Dec 2004
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From: Denver, Colorado
C6 Tranny Question
Does anyone know if there is any difference between the C6 trannies from the 67-72 f-series trucks and one from a 78 ford ltd ex-police car? I found this tranny locally and supposedly works great - planning on dropping it into my '68 highboy.
Thanks.
Craig
Thanks.
Craig
Postmaster
Joined: Apr 2002
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From: Coal country
I must disagree with 71SC about identifying the C-6 transmission by the tailshaft. The bolt-on tailshaft does not indicate a truck transmission, nor does it indicate a stronger one.
The F-100- 250 series came with either, and I no one I know has been able to determine the reason why.
I have had a '76 F-250 with the longer tail and slip shaft, and a '72 F-100 with the bolt on. I have seen longer tailshaft car C-6s with the heavier duty innards (extra clutches) than a bolt-on truck C-6.
I have never seen a bolt-on tailshaft in a car, but I have seen both in the trucks.
71SC is absolutely right about the shift arm, though. To make it shift correctly, the truck arm must replace it.
The F-100- 250 series came with either, and I no one I know has been able to determine the reason why.
I have had a '76 F-250 with the longer tail and slip shaft, and a '72 F-100 with the bolt on. I have seen longer tailshaft car C-6s with the heavier duty innards (extra clutches) than a bolt-on truck C-6.
I have never seen a bolt-on tailshaft in a car, but I have seen both in the trucks.
71SC is absolutely right about the shift arm, though. To make it shift correctly, the truck arm must replace it.
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I was trying to help the original post of C6 differences between 67-72 trucks and 78 ltd's. Lots of later trucks had the slip yolks. The bolt on yolks were for the two piece driveshaft two wheel drives and the divorced transfer cases on 4x4's. The later one piece driveshafts had the slip yolk at the tranny instead of the carrier. With the original post being a highboy it should have the bolt on between the tranny and divorced transfer case. I haven't come accross any car trannies with the bolt on yolk and two peice driveshaft. The longer car tranny may be a problem if it would have the output pushing his transfer case back from its original position.
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Postmaster
Joined: Apr 2002
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From: Coal country
Yep, when discussing 4x4, that's an entirely different story. I was only referring to 2x4, since that is my only experience.
Thanks for pointing that out.
By the way, changing the shift lever is not hard, and can be done with simple hand tools with the transmission in or out of the truck.
Thanks for pointing that out.
By the way, changing the shift lever is not hard, and can be done with simple hand tools with the transmission in or out of the truck.
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Logistics Pro
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When I was doing transmissions at the dealership I made some special wrenches for removing the shift shafts on the various Ford trannys.
Today, now that I work for the city, I look at those wrenches in my roll-away, that now sits in my garage, and remember where I used to was.
Today, now that I work for the city, I look at those wrenches in my roll-away, that now sits in my garage, and remember where I used to was.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
From what I was told by the local builder that I have used. All gut packages will swap between the cases. The pickups have a different shifting arm from the cars. The pickup arm runs along the case/pan with the car hangs down at a 45º angle. There are long & short tails as well as ones that transfer cases bolt up to.
So Craig, you may have to do a gut swap to make everything work. The FE was the V8 engine used in your year truck, and were last used in trucks in 76. $600-700.00 should buy you a rebuild.
John
So Craig, you may have to do a gut swap to make everything work. The FE was the V8 engine used in your year truck, and were last used in trucks in 76. $600-700.00 should buy you a rebuild.
John
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So, I hope I'm not stealing this thread, but I recently acquired a '68 high boy that has a 390 and a C6 in it. The had to cut a hole in the lateral frame member to get the C6 to fit. The shift mechansim is all wrong and now I suspect it is becuase they are using the car shift arm. What exactly does the truck one look like?
Peter
Peter
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Peter, they basically look the same, just positioned differently. I have a car tranny in my truck the shifting is binding and I can hardly get it into or out of low.
Hope to get the correct one in shortly.
John
Hope to get the correct one in shortly.
John