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cannot push truck backwards

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Old Apr 18, 2021 | 05:37 PM
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Angry cannot push truck backwards

I have had the engine rebuilt and bought a c6 that was freshly rebuilt
I was able to drive perfectly fine until one of the lifters broke and was able to get the engine rebuilt again for free but dropping the engine in and installing it to the transmission I cannot push the truck backwards at all.
I unlinked the shifter and manually shifted and found that P works but R-N-D-2-1 all move the truck forwards but not backwards
When i disconnect the drive shaft, the truck moves freely.
 

Last edited by CaptainForgee; Apr 18, 2021 at 05:40 PM.
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Old Apr 18, 2021 | 05:41 PM
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you can't physically push the truck, or the truck's transmission wont shift into reverse and move the truck backwards under it's own power?
 
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Old Apr 18, 2021 | 05:47 PM
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Do you have a transfer case?

Ergo 2wd or 4wd?
 
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Old Apr 18, 2021 | 05:50 PM
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I can push the truck but with a vehicle, I cannot push it myself.

The engine needs to break in but before I run the engine, I have to fix this transmission so I don't ruin anything


It is a 2wd, no transfer case
 

Last edited by CaptainForgee; Apr 18, 2021 at 05:57 PM.
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Old Apr 18, 2021 | 07:07 PM
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Originally Posted by CaptainForgee
I can push the truck but with a vehicle, I cannot push it myself.

The engine needs to break in but before I run the engine, I have to fix this transmission so I don't ruin anything


It is a 2wd, no transfer case
I'm guessing you removed the linkage and kickdown? It's possible you may have slipped something inside the trans... Have a look at this thread.

'71 F100 C6 - Won't Go Into Reverse or Park - The FORDification.com Forums
 
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Old Apr 18, 2021 | 09:18 PM
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I dropped the pan and checked and the linkages are correct. I can hear it click when shifting and Park works fine.

I have the old c6 transmission that came out of the truck (worked fine before but cracked the bellhousing) and it is also doing the same thing. The tail end only spins clock wise but i have to use a lot of force to spin it counter clockwise.

 
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Old Apr 18, 2021 | 10:08 PM
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Originally Posted by CaptainForgee
I dropped the pan and checked and the linkages are correct. I can hear it click when shifting and Park works fine.

I have the old c6 transmission that came out of the truck (worked fine before but cracked the bellhousing) and it is also doing the same thing. The tail end only spins clock wise but i have to use a lot of force to spin it counter clockwise.
If the linkage is good then it's fine... drop the drive shaft and run in your engine.
 
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Old Apr 18, 2021 | 10:33 PM
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Ok great! I'll let you know by the weekend if everything goes well!
 
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Old Apr 18, 2021 | 11:19 PM
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Or put it up on 4 jack stands which should be easier than taking the driveshaft off
 
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Old Apr 18, 2021 | 11:23 PM
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The C6 has no direct connection if the engine isn't running. So either the torque converter isn't seated and the pump is now jammed or the transmission was assembled wrong and the one way clutch is broken or bound up.
 
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Old Apr 19, 2021 | 10:58 AM
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Band is too tight. They always turn harder CCW but you should be able to turn it by hand in neutral with a fair amount of resistance.
 
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Old Apr 19, 2021 | 11:00 AM
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Originally Posted by headloct
Band is too tight. They always turn harder CCW but you should be able to turn it by hand in neutral with a fair amount of resistance.
Yup... The trans hasn't even been lubed in yet. I am standing in front of my C6 now, driveshafts dropped and it's tough to roll the output shaft in reverse too... not unusual.
 
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