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Driveshaft will not slip all the way into transmission (6sp swap).

Old 08-11-2018, 04:04 PM
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Default Driveshaft will not slip all the way into transmission (6sp swap).

Hey guys, I'm RIGHT at the end of my FM1/6sp/3.63 rear end swap (going all in). Everything went... Surprisingly well tbh. Except right at the end, I go to slip the driveshaft into the transmission and it goes about 75% of the way but will not go any further.

I can tell it's not going in all the way because I can see where the yoke is shiny from previous installation.

It's not going in far enough to get the driveshaft onto the diff.

I looked inside the trans, I have a camera probe, see nothing. Looks clear.

If I push it in as far as it will go currently(not even hard mind you...)it gets stuck, and I have to take a hammer to it to get it out.

I did try tapping on the rear of the driveshaft with a rubber mallet to get it to go in, did nothing (it was getting stuck before this, so it's unrelated).

If I put the car in gear, I can't spin the driveshaft, so I know it's going in at least over the splines.

I did replace the tailshaft seal, but I was extremely careful getting it out. Didn't even stick anything down or near the output shaft on the trans.

Splines look ok on both ends.

Any advice from anyone will be greatly appreciated. I'm really excited to be driving with the new stuff.


Oof, I should add my car is a 95 (not a 95.5). I'm swapping from stock clutch/5-speed/4.1 rear end.

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Old 08-11-2018, 04:56 PM
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Look in both the holes
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Old 08-11-2018, 05:03 PM
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Yea I just was, it looks like the output shaft splines on the trans are twisted. Wtf? How does this even happen?
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Old 08-11-2018, 05:21 PM
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Old 08-11-2018, 06:18 PM
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Is your PPF cracked where that thing is welded?
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Old 08-11-2018, 06:26 PM
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Originally Posted by psyber_0ptix View Post
Is your PPF cracked where that thing is welded?
Nah it's not. It does look like it though.

I just got the trans back out again. I can confirm 100% the output shaft is broken. It's twisted like the barrel of a gun, and it's sheared right where the driveshaft sits inside when it's bolted up to the diff.
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Old 08-11-2018, 06:50 PM
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Where are you located?
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Old 08-11-2018, 06:54 PM
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Originally Posted by sixshooter View Post
Where are you located?
SoCal. San Bernardino specifically (that's where I live), however the car is in Apple Valley at my parents where all my tools are.
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Old 08-11-2018, 06:58 PM
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Maybe someone who has blown up a 6speed can send you that shaft and you can swap it.
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Old 08-11-2018, 07:19 PM
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Originally Posted by sixshooter View Post
Maybe someone who has blown up a 6speed can send you that shaft and you can swap it.
I don't have the tools or expertise to do it myself.

The seller (who is a member here hence why I haven't said names) is offering a full refund. I think I'm gonna go with that and just turn around and use the money to replace the shaft. There is a great transmission shop up here by my parents. They rebuilt my little bros jeep transmission and 80k miles later it's still going great.
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Old 08-11-2018, 08:10 PM
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Best pics I could get.


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Old 08-11-2018, 10:10 PM
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Torque
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Old 08-11-2018, 11:35 PM
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I'm sad, no one laughed at my witty link
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Old 08-12-2018, 01:49 AM
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thats wild that it twisted the splines like that.

get a matching twisted driveshaft from the seller. problem solved. lol
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Old 08-12-2018, 01:54 AM
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Originally Posted by curly View Post
I'm sad, no one laughed at my witty link
Tbh, I did irl, I just didn't post anything about it. I really wish I had the money, tbh.

Originally Posted by borka View Post
thats wild that it twisted the splines like that.

get a matching twisted driveshaft from the seller. problem solved. lol
Hahaha yea someone else suggested that as well!
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Old 08-17-2018, 03:17 PM
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I'm impressed someone managed to twist those splines before breaking the gears honestly.
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Old 08-17-2018, 03:23 PM
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Yeah, I kinda feel like a special prize for Mechanical Anger is warranted here. I have NEVER seen the input shaft twist like that.

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Old 08-17-2018, 07:57 PM
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Your PPF is most definitely cracked, by the way.
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