T-10 4 spd transmission (not super t10) The yoke slides in about 2 inches and stops, thats only about 50% down the yoke!!. Its a 16 spline and my yoke is about 4 inches. A long time ago when i was measuring to shorten my driveshaft, I pushed it in until it stopped and pulled out a bit, then measured back to the rear.... I noticed the yoke wouldnt push in all the way even way back then but thought this must be normal. Since then I've been told this is simply just NOT right... I've driven very little and very lightly, because I know my driveshaft is too short... or I should say... that the yoke won't push in all the way, causing me to order a driveshaft too short.... I wanted to get a new driveshaft and before I do that I'm investigating about this yoke issue first. Now I've shown the yoke to a driveshaft professional and showed him the point at which the yoke is in the tail as far as it will go and he says thats just not far enough. My current yoke is wearing a notch in itself from the bushing because its not riding right. So what could be causing this oddity? He gave me another yoke to try but it does the same exact thing, maybe this transmission takes some weird rare yoke or something. i'm such a pessimist. He said the yoke should slide in almost to the end of it. I took a piece of rod and stuck it in the tail of the trans and rode up and down to see if i felt a burr or any other obstruction on the tail shaft, but i didn't feel anything out of the ordinary. then i went around in circles with the rod inside the tail of the trans to see if there was something obstructing around the outer edges, but again i didnt feel anything. i could stick a small screwdriver or a rod waaaaay up in there before it stopped.... on the other hand, the yoke goes in about 2" then stops. if you take a hammer and tap it it will go another 1/4" or so, but then you have to absolutely beat on the sucker to get it back out. ps my yoke is 4" long ..... and there is 1/2" of tailshaft sticking out of the back of the trans and that seems to be the proper amount so that seems to rule out incorrect tailshaft housing. so to review if my yoke only goes in 2" and there is 1/2" of tailshaft sticking out, its bottoming out at about 2-1/2" total spline contact. if I pull it out 3/4" or 1" to prevent jamming and go like that, i'd only have 1-1/2 to 1-3/4" total spline contact. not enough according to my driveshaft guy! Something is just not right here. I'm afriad if i start tearing the transmission apart i'll be in over my head quickly and end up having to tow the car to the shop ($$$$) Any help appreciated. And if you're wondering why I dont just ask these questions to the so-called driveshaft expert, its because you have to tread so lightly around this guy, he's old and cranky and he'll get mad and bite your head of if you're not careful... but he's the best around with driveshafts so I'm just trying to get the most info as I can from you guys so I can learn up on the subject. Please help!
Could be... any way to tell if its twisted except dismantling this thing? PS I think this trans has a date of of 1962 if I'm not mistaken... i'll double check when i get home.
amazingly enough - it is common for the output shaft splines to twist a bit. This is caused by full power launches by dumping the clutch. Serious speedshifting will do the same thing, and/or exacerbate the problem. If you can POUND the yoke in, then you've got some twisted splines. it doesn't take much at all - you need to address this ASAP for several reasons. Take off the tailshaft - you'll see what I mean dj
That statement alone reads twisted driveshaft. As for your expert,,,, find a new one, this is pretty basic stuff here.
i think you meant to type twisted output shaft. my expert didnt look at the car, just the driveshaft, and I dont think i told him about the beating the yoke in and gaining a quarter inch. You're right it does make sense, your theory is....the yoke is going in and the yoke itself is straigth and it gets to a twisted part of the output shaft and the further I pound it in there, the tighter it gets, sort of like a bolt thats going in cross threaded sorta..... where in the world can I buy just an output shaft????
Is it a brand new yoke? I bought a new yoke for my 59 Chevy, when I changed from a stock 3 speed to a Muncie 4 speed, and had the same problem. I compared the new yoke to an extra one that was about 30 years old. Measured both with a dial caliper, and the new one was slightly larger in diameter. I assume that the new one was machined wrong. As far as I know the new yoke wasn't made in China. I ended up using the 30 year old yoke. It slid right in, just like it was supposed to.
Use solvent and a stiff stainless brush to scrub the female splines on the yoke. Remove the tailshaft housing, do the same with the male splines on the output shaft. Wipe some white grease, high pressure grease or even oil on both splines and see if the yoke slides over the output shaft. If it's not bent it'll probably go together fairly easy. Did this with my junkyard T-400 dummy and it went together with no probs.
does the tailshaft just unbolt and slide off pretty easy or do ya gotta dismantle a ton of stuff. any tips would help before i dive in.
I meant to remove the tailshaft housing. You'll have to support the trans end weight cuz more than likely your trans mount is on the tailshaft. Leave the tailshaft in the trans, you can scrub it clean with no probs since the tailshaft splines will be exposed. You'll have to drain some trans fluid before you pull the tailshaft housing. Sorry for the confusion.
I have had several T-10's with twisted output shafts, unfortunately unless you have the yoke that the output shaft was twisted with, you need a new shaft.
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