truck rolls in park

[SSMOORMAN@VERIZON.NET]

Just recieved my M1028 yesterday from Warner Robins ABF . it has a bent drive shaft and tranny problem, what would cause the truck to roll in park , all gear work fine forward and reverse . i have manually switch it into every gear by hand by removing the linkage at the transmission.

 

[stumps]

"Park" is just a pawl that locks the drive shaft from turning. If you get pushed while in park (by a fork lift, perhaps?) , the pawl will often get broken.

-Chuck

 

[SSMOORMAN@VERIZON.NET]

Is it much work to fix , do i need to remove transmission to fix it.

 

[pigfoot63]

Parking pawl my be broken, or transmission may have been replaced with one from a HMMV. which doesn't have a parking pawl. Either way just drop the pan and take a look.
Can be fixed without removing trans.

 

[SSMOORMAN@VERIZON.NET]

Thanks , i will give that a try . thats what i get for not inspecting the truck first .

 

[blackhueys]

you can add the pawl if I remember right to the hmmwv trans if it is the old style not the 4l80e that trans does have park just like a civi truck at least if I remeber from my m1151 maint training class.

 

[SSMOORMAN@VERIZON.NET]

what is the reason for not having a parking paws on them. im hoping it is something easy to fix.

 

[stumps]

Parking pawls break if you push, or run into a truck that is in park. A friction brake just slips, and then continues holding when the push ends.

Broken Park pawls used to be a pretty common problem in parking lot accidents.

-Chuck

 

[cyamaha2007]

Ive seen parking paws break when you break the drive shaft and put it in park. The trans is still moving even tho the truck isnt. Or if you have the tcase in neutral and try to put it in park.

 

[SSMOORMAN@VERIZON.NET]

If the paw broke willl there be a part of it laying in the transmission cover. .
Im not to sure what i will be looking for . thanks everyone for the help.. i will
be loading pictures of the ( 3 ) M1028 trucks i have before i start working on them.

 

[ranchhopper]

Did you check to see if the transfer case is in gear if it was in neutral it will roll in park.

 

[wreckerman893]

Sounds like your truck was a victim of the dreaded "GL forklift syndrome".

I saw a lot of CUCV and 5/4 ton trucks being unloaded off trailers with a big forklift....they usually manage to dent the driveshaft on everyone they pick up like that.

 

[86m1028]

Just recieved my M1028 yesterday from Warner Robins ABF . it has a bent drive shaft and tranny problem, what would cause the truck to roll in park , all gear work fine forward and reverse . i have manually switch it into every gear by hand by removing the linkage at the transmission.

Is the t-case in gear ?

 

[SSMOORMAN@VERIZON.NET]

yes the transfer case is in gear ..i have tried everything so far . next i will be opening up the transmission and looking at the paw.