Thread: GMC TH350 issues

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Originally posted by racerrick
I've also been told not to use silicone on a tranny gasket. If the silicon drips off on the inside you will have major problems with the internals of the tranny. If the pan is straight you shouldn't have to use the silicone. I had the same problem you are having. I pulled the pan and eye balled the mating surface and discovered that the spaces in between the bolts was lower than at the bolts. Once I straightened it, it worked fine. Has anyone used a screw driver to pry off the pan?

Good luck!

i guess i was just lucky i didnt drop some silicone in 1 or 2 of the over 500 trans ive rebuilt over thr years. who ever told you that dont know what he is talking about and nither one of you know what you can and cant do to a trans. pan. you asked a ? i tell you what i did with a lot of success over the yrs and you tell me it cant be done. im glade i found it out before i messed up any more of them. if everything is right you dont need it, but he has a problem and its a easy way to eliminate the pan.

Does your transmission shift gears cause if it doesn't the valve body might be sticking and might be spitting transmission fluid out of the dip stick hole and if thats the case that o-ring is not going to stop leaks.

I guess we all can't be as good as you. 500 tranny's huh, wow, that's really impressive. Sounds like they keep you busy with all those rebuilds. Hmmmmmm wonder why?

This ain't my first rodeo cowboy!

i dont claim to be nothing, but if you are telling people on this board that they cant use RTV Silicone Gasket on a trans. pan then you are giving bad information and if i see it i gonna say something about it. its obvious you' ve never rebuild any trans. but for somebody that does it for a living thats not a lot of trans.

I am just offering my humble opinion. I have 3 years in the automatic transmission buisness. My father has 43 years in the buisness. With the exception of the chrysler product 404, 604 transaxle that in the manual states to use silicon only with no gasket, we have never used silicon on any pan gaskets. As long as you tap the bolt holes down, use a good gasket, and don't over tighten the bolts, the gasket alone will work just fine.

how its used should be up to the one using it, they said you was not suppose to use it at all, and thats not true.

You need to go back to the original posting by 29arod. Note item number five. "Installed dry per spec" I guess those engineers don't no s--- over at GM. 29arod has isolated the problem by listing his procedures.

Hey 29arod, where did you buy that rebuilt tranny anyway?

Originally posted by racerrick
You need to go back to the original posting by 29arod. Note item number five. "Installed dry per spec" I guess those engineers don't no s--- over at GM. 29arod has isolated the problem by listing his procedures.

Hey 29arod, where did you buy that rebuilt tranny anyway?

ive been to all the GM schools racerrick and i don't remember it ever being an issuer on whither you should or shouldn't use sealer, as far as using it with or without a gasket sometimes i do and sometimes i don't. it depends on the job, and no i don't do everything by the book, because the book ant all ways right. the part i don't understand it why people like you get on a fourm like this and try to answer? about something they don't know nothing about is beyond me. Then when someone gives a tried and true fix, then he is a cowboy, and you know what I think that makes you a bunch of cow sh*t. and you shouldn't be posting on something you know nothing about.you said you should not use silicon on a auto. trans. and thats a false statement.

Well, I guess I got'cha cowboy. You win. I'll never disagree with anyone again. Didn't know it was such a touchy subject, this pan stuff.

You have a nice day...............................cowboy.

Wow this turned out to be a fun one. In the end, personal preference is what should be taken into account. Some use it, i don't but I am not going to tell anyone not to use it. Hell I know of people that use copper coat on trans pan gaskets. Its all personal preference. Which ever method is chosen, the main thing is to ensure that the pan rails are straight, the bolt holes taped down prior the reinstallation, and tighten the bolts to spec. I'm still pretty new here but I just thought I'd offer my opinion.

Originally posted by blue57ford
Wow this turned out to be a fun one. In the end, personal preference is what should be taken into account. Some use it, i don't but I am not going to tell anyone not to use it. Hell I know of people that use copper coat on trans pan gaskets. Its all personal preference. Which ever method is chosen, the main thing is to ensure that the pan rails are straight, the bolt holes taped down prior the reinstallation, and tighten the bolts to spec. I'm still pretty new here but I just thought I'd offer my opinion.

thats good advice blue57ford.

Sorry. I meant tapped down. Not taped down.

Originally posted by blue57ford
Sorry. I meant tapped down. Not taped down.

whatever workes.

Look guys I didn't intend to offend anyone. You all know your stuff pretty good and I'm not here to supervise, just another guy in the trenches and yes I agree that what works for you after many trials and errors(we all go thru it after about 50 years of being on this good old planet ) is what you should stick with. We all do things different and that is why we continue to go to shows and rod runs to get ideas. I respect every one of your opinions and will concede that a sealer, used lightly, wouldn't hurt but sometimes when you tell someone to use a sealer they usually want to use too much, that's all.

Hey 29Arod, if your still there, what type of transmission mount do you have in your A? Now that you've changed the tranny out, would you do anything different with the mount? I'm setting up the frame on my 30 and wanted to see if you had any suggestions. Thanks in advance for your help.

i said "id put a "little" bead of silicone around the pan for good measure", if some body can read anything else into that then thats their problem. i guess its time for me to get in a dif line of work im getting to take this crap to serious. i dont know why i just dont let it go, but i cant. if every + is offset be a - then nobody gets anything out of it. ive posted twice this week with answers from 40 yrs of experience and got shot down both times by something someone heard and by something someone read. if all i had to post on is something i heard id stay at home. here lately every time i give a tried and true answer, its neutralized by somebody that has no idea what works or don't work, and then you try to tell them how you know, you are bragging or you're a cowboy (whatever that means) and if the book was so good you wouldn't need to be on here asking how to fix it no way. 1/2 of the stuff in the book dont work in real life. i don't give an answer on how to repair something unless Ive done it a lot of times and know it works. and no I don't like being told Im wrong by someone that has no idea what he's talking about, if you can prove me wrong then you can say anything you want. i doubt seriously whether you can come up with a lot of dif things that i haven't tried over the yrs. and some i used and some i didn't and none of them because somebody told me I had to. most of the time I had sense enough to come up with a workable solution for me, and if experience make me a cowboy then im a cowboy.