Tranny trouble?
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Tranny trouble?
I was plowing in my 85 f250/460 4speed 4x4 this past weekend when trouble arose. I had just plowed a very steep driveway and backed up to clear around the mail box. i put it in first gear and it felt like the E brake was on. I could not move in any forward gear. I tried reverse and as able to back up. Then the tranny was stuck in reverse and I was unable to move. I put the transfer case in neutral and was still unable to move. She was locked up tight. Unfortunately I had to call a rollback and as she was being drug across the snow I was able to free up the tranny and roll up on to the roll back free wheeling. I parked it in the driveway and she started right up in the morning and backed up fine but in ten feet same thing. Locked the tranny up again. Finally got it out of reverse today and left it in neutral to drag into the shop. I was wondering if anyone had suggestions of where to start?
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Sounds more like your pinion is loose.
Are you saying you can't get the stick out of the reverse position?
Can you not put the transfer case in neutral?
That's got to be better than dragging the truck in gear.
Are you saying you can't get the stick out of the reverse position?
Can you not put the transfer case in neutral?
That's got to be better than dragging the truck in gear.
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Tranny troubles?
Once I went in reverse and the truck would not move any longer I was unable to disengage the transfer case. The handle on the floor moved freely, however the wheels stayed locked. I agree dragging the truck is not the best but I had no other choice due to the conditions and location I was in. The roll back was able to get within 100 feet of the truck and pull it on the snow covered road. Once the truck was pulled for several feet it finally freed up and was able to roll.
I drifted it down the driveway off the rollback once I got home with the transfer case disengaged. I started it up the next day to back it into the shop and same thing backed up fine then locked up tight again in Reverse and forward gears.I never heard any grinding or felt any unusual signs of something be wrong until the wheels locked up. I was going to drop the drive shafts and see if she will roll to get it in the shop. Any other thoughts? Thanks for your reply.
I drifted it down the driveway off the rollback once I got home with the transfer case disengaged. I started it up the next day to back it into the shop and same thing backed up fine then locked up tight again in Reverse and forward gears.I never heard any grinding or felt any unusual signs of something be wrong until the wheels locked up. I was going to drop the drive shafts and see if she will roll to get it in the shop. Any other thoughts? Thanks for your reply.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
What I'm saying is the transfer case is between the gearbox and the differential.
If it is in neutral the truck should be free to roll.
If the pinion is loose, driving forward will pull it into the carrier and lock up the rear, but reverse will just push it out against the shim
... Until its loose enough to jamb.
If it is in neutral the truck should be free to roll.
If the pinion is loose, driving forward will pull it into the carrier and lock up the rear, but reverse will just push it out against the shim
... Until its loose enough to jamb.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
crap had a whole thing typed out and I lost it!
Going to do it in word and move it over to here.........Stand by
Dave ----
What trany do you have, thinking stick? Locking hubs?
You may not have been able to move/roll the truck or get thetransfer case (TFC) out of gear because the drive train was in a bind. The rollback moving your truck could have let it “pop” to unbind and let it roll.
To see where the bind is get all 4 wheels in the air. TFC inneutral and see if the drive shafts turn my guess is they will. If not drop thedrive shafts and see if you can turn the pinions. With trany (stick) in neutralsee if you can let the clutch out and see if all works as it should. If not thetrany is stuck in 2 gears at the same time say first & reverse.
If all is good with both trany & TFC to this point putthe TFC in gear, trany in neutral and see if all is ok, wheels should not move.If ok I would then put trany in gear and see if the drive shafts turn again,they should. At this point all was checked what did you find?
Dave ----
Going to do it in word and move it over to here.........Stand by
Dave ----
What trany do you have, thinking stick? Locking hubs?
You may not have been able to move/roll the truck or get thetransfer case (TFC) out of gear because the drive train was in a bind. The rollback moving your truck could have let it “pop” to unbind and let it roll.
To see where the bind is get all 4 wheels in the air. TFC inneutral and see if the drive shafts turn my guess is they will. If not drop thedrive shafts and see if you can turn the pinions. With trany (stick) in neutralsee if you can let the clutch out and see if all works as it should. If not thetrany is stuck in 2 gears at the same time say first & reverse.
If all is good with both trany & TFC to this point putthe TFC in gear, trany in neutral and see if all is ok, wheels should not move.If ok I would then put trany in gear and see if the drive shafts turn again,they should. At this point all was checked what did you find?
Dave ----
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Does your truck have a Dana or a Sterling rear axle?
What's the manufacture date of your '85 truck?
What's the manufacture date of your '85 truck?
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Moderator
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From: Virginia
My first thought would be the rear brakes hanging up. When they do that it will usually let you go in reverse but not forward. This may be a combination of the parking brake cables sticking and a rusted wheel cylinder.
Something else that can cause the brakes to lock up is a plugged compensation port in the bottom of the master cylinder reservoir. This can be caused by dirt plugging the holes or the master cylinder pushrod is not retracting back like it should, which will leave the holes plugged.
I guess the first thing to determine is are the brakes locking up or is it a driveline problem. If the brakes are hanging things up, it would put the driveline in a bind and make it hard to get it out of 4wd.
Something else that can cause the brakes to lock up is a plugged compensation port in the bottom of the master cylinder reservoir. This can be caused by dirt plugging the holes or the master cylinder pushrod is not retracting back like it should, which will leave the holes plugged.
I guess the first thing to determine is are the brakes locking up or is it a driveline problem. If the brakes are hanging things up, it would put the driveline in a bind and make it hard to get it out of 4wd.
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pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Fuzz face. (the -other- Dave)
Four speed in a 4x4 460 would be a T-19 with 6.32:1 first gear.
You're basically tached out under 10mph.
With 4.10's and TC in low, you can walk alongside it and *nothing* will stop it except lack of traction.
Four speed in a 4x4 460 would be a T-19 with 6.32:1 first gear.
You're basically tached out under 10mph.
With 4.10's and TC in low, you can walk alongside it and *nothing* will stop it except lack of traction.
FTE Legend
Joined: Nov 2015
Posts: 30,880
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From: Angier, NC
guess I should read more carefully - 4 speed So a "top loader" shifter in thru the top, so if trany stuck between 2 gears it would be a bent or broken shift fork.
With the transfer case in neutral and trany he should be able to let the clutch out with out stalling the motor like if it was stuck in 2 gears.
If that works I would put trany in different gears and do the same, transfer case in neutral and see if all is good between all gears.
If that checks ok good I would jack up the truck all 4 wheels and see if they turn with the transfer case & trany in neutral.
If not he will have to dig deeper to see why. Locked brake or locked R&P?
Dave ----
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