Automatic Transmission - 88 C1500

[hotrodpc]

Here the deal, parking pawls usually don't break. Sure its possible, but I'd suspect 2 other things first. There is rod that pushes the pawl into the outer gear that is connected to the output shaft which locks it is place and its also spring loaded. The builder could have forgotten to put the rod in place when installing the linkage to the manual valve, or he didn't put the spring on the end of the rod. No big deal if that is the case. Pull that pan and install the parts properly, problem solved.
#2, it is possible if someone did a hard part change/upgrade on the outer planet that connnects to the output shaft, it could be of a differant design so the old style pawl does not work with that style outer planet. To correct that if its is issue, 1 of 2 things, either pull the trans and put the correct outer planet gear in the trasn, or try to find the correct pawl that goes with the updated outer planet and change out the pawl and that should correct the problem. I say either way, it should be an easy fix, but you're not likely to know anything until you pull the pan and inspect. Good Luck.

 

[hotrodpc]

EDIT*** BTW, when I said either way should be easy fix, I was reffering to hooking up the rod or spring to the linkage, or change the parking pawl. The change out that rear planet gear, requires pulling trans and gutting it. That rear planet to the output shaft, is just about the first thing that goes in the case other than a selective thrust washer and low/reverse clutch pistons and seals. I don't think you need to go to that extreme IF that is even the problem. I say its more lkely the linkage rod or spring is not hooked up or installed.

 

[davbell22602]

EDIT: Miss understanding whats going.

2 weeks after a rebuild the truck wont move at all but will roll in neutral. Just spins like in neutral. This has overdrive.

 

[LeanderthalMan]

This is a confusing post.

 

[hotrodpc]

EDIT: Miss understanding whats going.

2 weeks after a rebuild the truck wont move at all but will roll in neutral. Just spins like in neutral. This has overdrive.

Yepper, very confusing explanation here. So, its not a parking pawl problem at all then. The truck does NOT ROLL when its in PARK???
Lets punctuate this sentence so it make sense a bit and see if it makes a difference.

2 weeks after a rebuild, the truck wont move at all, but will roll in neutral. Just spins like in neutral. This has overdrive.

I assume 2 weeks after rebuilding the transmisison, not the truck right??? Now, THE TRUCK won't move at all, but will in netural. Meaning you can push the truck in neutral right? OR do you mean the truck actually moves with its own power in Neutral? IF you are certain its overdrive, then most likely a 700r4, NOT a Turbo 350. For 88 model year 1/2 ton, 700r4 would be the most common transmission. Did the transmisison work good BEFORE this 2 week period? Did it have overdrive? Did the Converter Clutch lock-up as it should?

 

[davbell22602]

EDIT: Miss understanding whats going.

2 weeks after a rebuild the truck wont move at all but will roll in neutral. Just spins like in neutral. This has overdrive.

Yepper, very confusing explanation here. So, its not a parking pawl problem at all then. The truck does NOT ROLL when its in PARK???
Lets punctuate this sentence so it make sense a bit and see if it makes a difference.

2 weeks after a rebuild, the truck wont move at all, but will roll in neutral. Just spins like in neutral. This has overdrive.

I assume 2 weeks after rebuilding the transmisison, not the truck right??? Now, THE TRUCK won't move at all, but will in netural. Meaning you can push the truck in neutral right? OR do you mean the truck actually moves with its own power in Neutral? IF you are certain its overdrive, then most likely a 700r4, NOT a Turbo 350. For 88 model year 1/2 ton, 700r4 would be the most common transmission. Did the transmisison work good BEFORE this 2 week period? Did it have overdrive? Did the Converter Clutch lock-up as it should?

Will roll in neutral when pulling it with a chain. It has P R N @ D 1, etc. Its a 89 C1500. I actually saw this thing today. The guy who had was using it haul pickup loads of mulch. I assume it worked good cause he was hauling mulch then all sudden it wouldn't move anymore.

 

[PenguinLTZ]

Wow. A whole new ball game.

 

[hotrodpc]

EDIT: Miss understanding whats going.

2 weeks after a rebuild the truck wont move at all but will roll in neutral. Just spins like in neutral. This has overdrive.

Yepper, very confusing explanation here. So, its not a parking pawl problem at all then. The truck does NOT ROLL when its in PARK???
Lets punctuate this sentence so it make sense a bit and see if it makes a difference.

2 weeks after a rebuild, the truck wont move at all, but will roll in neutral. Just spins like in neutral. This has overdrive.

I assume 2 weeks after rebuilding the transmisison, not the truck right??? Now, THE TRUCK won't move at all, but will in netural. Meaning you can push the truck in neutral right? OR do you mean the truck actually moves with its own power in Neutral? IF you are certain its overdrive, then most likely a 700r4, NOT a Turbo 350. For 88 model year 1/2 ton, 700r4 would be the most common transmission. Did the transmisison work good BEFORE this 2 week period? Did it have overdrive? Did the Converter Clutch lock-up as it should?

Will roll in neutral when pulling it with a chain. It has P R N @ D 1, etc. Its a 89 C1500. I actually saw this thing today. The guy who had was using it haul pickup loads of mulch. I assume it worked good cause he was hauling mulch then all sudden it wouldn't move anymore.

Keep in mind Dave, auto transmisisons are very complex, especially when you get into OD units. So an explicit explanation is needed, and some questions are asked for a reason in determing a best guess for troubleshootng. But, it does not sound as if you really know alot about this situation other than transmisison isn't right. IF you are certain its an overdrive trans, and just becuase it has P.R,N, OD, D, 1 on the shift selector in the cab doesn't mean its an overdrive trans. Many times the OD trans is swapped out for a stronger more durable NON OD transmission. Assuming it is an OD unit, 700r4 which would be the factory OEM trans, did the converter clutch lock up as it was supposed to in the prior 2 weeks to it working properly? Did it engage OD properly? Are you saying in R or D the truck can not move even with a chain towing it??? Without knowing much about it, I'll throw a guess out there and that's only based on an assumption. I hear of stories like this on 700r4, that I just had the trans rebuilt, and 2 week later its broke and doesn't work and the builder is shitty and stupid and won't warranty his work. 99% of the time when this is the case that you explain its the installers fault. Not the builder. A 700r4 MUST HAVE THE TV CABLE HOOKED UP, and it MUST BE ADJUSTED PROPERLY. If not, the transmssion can not regulate fluid pressure to the proper channels and apply enough pressure for the clutch pistons to compress the clutches tight enough, therefore causeing slippage and severr overheating of the clutch packs and the transmisison only lasts about, take a guess !!! Yep, 2 weeks on average at say 30-50 miles a day of driving, even less if you are pulling heavy loads of mulch. It doesn't take long to fry the trans if the Throttle Valve (TV) Cable is not installed, hooked up, and adjusted properly.

 

[hotrodpc]

Hey Dave, did you get any more info on this trans as far as specific symptoms??? Let us know what comes of it.

 

[davbell22602]

Hey Dave, did you get any more info on this trans as far as specific symptoms??? Let us know what comes of it.

Ok, I'm gonna buy the whole truck without the bed for $400 w/no title. Its going to be a parts truck for me. I'm gonna take the rebuilt gm crate out and put in my 2500 since it has 3 or more rods knocking. The fuel pump is either frozen or needs replaced from for 1 or 2 years with a full tank of gas. Will stay running when spraying carb cleaner in the carb/injectors. This was a abandon vehicle on a landlords property.