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Old 03-26-2012, 06:14 PM
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TH350 woes

I purchased a '76 Chevrolet C-10 long bed about a year ago....started with one thing and it led to a million things to say the least......reconditioned motor, heads, a bunch of other stuff (gauges, air conditioning, headers), as well as a new flywheel (other was cracked all the way around except for 3/8" of material), new filter, new seals both front and rear. After to making a move three hours north, been using it as my daily driver.....that's where the i began hearing noises and seeing fluid leaking.........I've changed out the rear seal again, did not help. also drilled out and tapped new threads in the housing to seal the pan better (some bolt passages were stripped), inspected the transmission yoke for wear and tear.....haven't seen anything. So i've just just been keeping check on the fluid. Whenever i put the transmission into gear, be it reverse or drive, it makes a loud clank and recently started sounding like something is scraping afterwards. I honestly think the transmission is about to go, but dont know where to start looking anymore. Any ideas on what the problem could be??? Also if in agreement on the TH350 kicking the bucket, what all would i need to install a 700r4 in its place??? I need a little more gas mileage, $25 bucks a day to go to and from work is going to kill me.......................

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Old 03-26-2012, 07:28 PM
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Does the scraping noise coincide with wheel speed?...sounds like a dried out u-joint...if thats the case,you have to pull the driveshaft to verify,as if it's checked still in the truck,it will seem ok [tight,no slop] but upon removal, it will STILL be tight,in turn,causing that scraping type noise...have you done that yet?
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Old 03-26-2012, 07:37 PM
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doing that tomorrow morning??? i didnt notice any play in the yoke or in the gear shaft.....all was tight when i changed the rear seal....but will update as soon as i do it tomorrow....also ive heard people saying that when you change out the seals you need to put sealant between the mating surface and the rear housing where they meet?? would you agree??
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Old 03-26-2012, 07:38 PM
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and yes it does coincide with wheel spin
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Old 03-26-2012, 07:46 PM
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if the seal is some sort of color [red,yellow,etc.],that is actually a sealer coating the manufacturers use,not just paint to prevent them from rusting on the shelve....however,I allways spray a little high-tack sealer on em before installing them.......oh,and make sure the u-joints pivot freely when you pull the driveshaft and check them...

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Old 03-26-2012, 07:55 PM
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yeah it has a red band around it....im starting to think the bad u joint might be the cause of the seal to wearing out prematurely, could that be the case? and have you ever done a th350 to 700r4 swap??
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Old 03-26-2012, 08:22 PM
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oh yea...its been a while...you'll need to re-locate crossmember,uses the same trans mount...get a throttle valve cable[aftermarket adjustable type]...filler tube and dust shield....if its a medium shaft 350 in there now,the driveshaft should go right in with no mods,don't hold me to that tho..but the yoke is the same....flywheel is the same....cooler lines will go right in...and there are kits that you can get to control lock-up,as well as less expensive alternatives.... the speedo gears should interchange from 350 to 700....like i said, it's been a while,someone will add to this,and correct me if needed....but its a pretty easy swap in a truck that size. lots of room under there to work.......and yes,a bad u-joint can wipe out a seal,as well as possibly the extension housing bushing.

Last edited by rick 427; 03-26-2012 at 08:31 PM.
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Old 03-26-2012, 08:49 PM
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okay...going to a pull-a-part this weekend to source one out....the current th350 has the long shaft(i think).....i plan on getting the lockup and a console shifter....gives me more confidence....appreciate that. i guess that if the drive shaft is too long or too short the next thing would be to get a weld shop to cut it down or take a tape measure with me to find a drive shaft that will fit. so i guess i found my next project.....thanks a million!
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