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4spd not seating all the way

WesleyK

WesleyK

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68 a833 4spd: ok so I’m putting a new gasket between the case and the tail housing. I’ve followed Passons manual to a T and all keys and gears seem the be lining up good and seating till there’s about not quite 1/8” before the housings touch and it won’t go any more. I installed the main shaft with the 1-2 and 3-4 slider locked in gear. When it seats they go to neutral position. I can rotate the input shaft when the sliders are in neutral. But then try to slide them back into gear and I can’t do that either. I done this over 7 or 8 times with the same result every time. And also all 16 of my roller bearings are seated and accounted for each time as well. So what am I missing guys?
 
Just did mine about 6 months ago, '67 18 spline, so it may differ from yours (small bearing/big bearing), but I believe I had to expand snap ring and tap tailshaft/housing towards main case to seat rear bearing fully and get them to mate up.
 
I know one case you have to expand the snap ring, and the other style you have to squeeze it to seat the tailshaft section into the main case. I think the earlier small bearing style one you expand and the later big bearing style you squeeze but my books are at home, so I am just going from memory. They can be a bitch to get to seat, but between that and making sure the input shaft is seated all the way in its place and the roller bearings are all in their place, it should go.
 
I didn’t remove the shaft from the tail housing if that’s the step your referring to with needing to squeeze the ring. All I did was change the gasket and now the two cases won’t seat together completely. I’ve pulled it out and reinstalled it probably 7-8 times with the same result so I know I’m just missing something. This is the first 4spd I’ve worked in so I’m new to all this haha.
 
WesleyK said:
I didn’t remove the shaft from the tail housing if that’s the step your referring to with needing to squeeze the ring. All I did was change the gasket and now the two cases won’t seat together completely. I’ve pulled it out and reinstalled it probably 7-8 times with the same result so I know I’m just missing something. This is the first 4spd I’ve worked in so I’m new to all this haha.
Click to expand...

Did you check and make sure one of the needle bearings for the input shaft didn't fall in and is laying down inside that cone sideways? I had that happen and it wouldn't let the tail section drop down into the needle bearings completely.
 
91r/t said:
Did you check and make sure one of the needle bearings for the input shaft didn't fall in and is laying down inside that cone sideways? I had that happen and it wouldn't let the tail section drop down into the needle bearings completely.
Click to expand...
 
I haven’t pulled it back out to check this time. But every other time they were all good and I was getting the same result. So I’m assuming they’re all still in place. It’s about 1/8” from the cases seating every time.
 
Here’s the gap

39754445-B2F1-4974-A63F-0CC57EC8A618.jpeg
 
Put the bolts in and snug them down. I'll bet they pull the parts together.
 
don't tighten the bolts!!! Reach down and spin the input shaft and the synchro between the two shafts will seat
 
69hemibeep said:
don't tighten the bolts!!! Reach down and spin the input shaft and the synchro between the two shafts will seat
Click to expand...
Thats where i was thinking my problem was. It seems to be seated though but again Im new to 4spds so I don't know. I can reach (barely) under the 3-4 slider and move the synchro side to side and it stops when the keys hit the edge of the grooves which is what makes me believe its seated. Im gonna call Brewers in a bit and keep trying. haha and i appreciate the bolt suggestion but Im not willing to try that or hammering. It should fit back like it came out.
 
Yup, this is one place where BFSI isn't the proper approach..
 
The reason I suggested tightening down the bolts (not hammering !!) is because these two parts are a snug fit for alignment purposes. They do not just "slip" together !! If you can move the syncros then things are aligned - snug the bolts down and it will pull together.
 
Stanton said:
The reason I suggested tightening down the bolts (not hammering !!) is because these two parts are a snug fit for alignment purposes. They do not just "slip" together !! If you can move the syncros then things are aligned - snug the bolts down and it will pull together.
Click to expand...
No I understand man, I appreciate the suggestion. I had thought of doing that but from looking at it I didn’t think it’d work.
 
Well I’m here under the words of Fred Sanford, “you big dummy”! During one of my previous attempts the 3-4 slider came off. When I put it back together I put the hub in backwards. I thought I was paying attention but apparently not. 100% humidity and 95 temps in south Mississippi take it out of ya lol. Anyway swapped it around and bang, went right in. I appreciate all you guys help and suggestions. But this one was on me, and only the Lord can fix that! Haha haha
 
Also, thanks to the guys at Brewers for suggesting the hub and making me second guess myself. It paid off!
 
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