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firebird7980 11-13-2011 01:36 PM

drive shaft seems to short after engine swap
 
i swap a 350 chevy into my v6 79 firebird. now i cant get my drive shaft in it. seems about 1 1/2 inch to short. my u joint cap line up will my yoke but i cant get it to go over the yoke and i notice the slip yoke on front is all the way in agaist the trans. i am using same trans 3 speed manual and same rear end thank you.

35terraplane 11-13-2011 05:20 PM

Short drive shaft
 
Quote:

Originally Posted by firebird7980
i swap a 350 chevy into my v6 79 firebird. now i cant get my drive shaft in it. seems about 1 1/2 inch to short. my u joint cap line up will my yoke but i cant get it to go over the yoke and i notice the slip yoke on front is all the way in agaist the trans. i am using same trans 3 speed manual and same rear end thank you.


If I'm reading this right your front yoke is in too far, as long as you are using the same transmission mounts, that front yoke should not be in all the way, you have to leave room for movement.

Bob

firebird7980 11-13-2011 06:17 PM

thanks for the reply i ment to long that why the yoke to far in the trans i didn't change the trans crossmember i cant get rear of shaft in rear yoke

poncho62 11-13-2011 06:31 PM

Then the transmission must be further back than it was before.....How did the rear cross member line up?

SSedan64 11-14-2011 01:59 AM

X2^^.
I'm not sure if the 3.8V6 & SBC Engine Mounts are in the same position. Frame Stands may need to be moved forward.

123pugsy 11-14-2011 03:38 AM

Is the back axle hanging or supported on stands?
If its on stands, move the stands and support only the frame of the car.

You can try using a pry bar to just get the u joint into the yoke. Once it gets clear and set into the yoke it will move back about 1/2 - 3/4".

firebird7980 11-14-2011 04:45 AM

I tied will axle hang and will axle on stand just will not go in I did have to switch bell housing may be that push the trans back just anuff for drive shaft not fit I guess I will just shorten it I read some post and it does should that hard to do thank for all the help

poncho62 11-14-2011 05:15 AM

I repeat......Is the rear transmission mount still in the same position....did it line up?

35terraplane 11-14-2011 10:20 AM

Drive shaft
 
Quote:

Originally Posted by poncho62
I repeat......Is the rear transmission mount still in the same position....did it line up?

poncho I asked that once and you twice I don't know if he understands us. To me it sounded like he has the front yoke into far. But then it sounded like the back won't fit because it is too long.

I guess the lucky thing is, he only has to cut one end.

Firebird
If you are going cut your drive shaft, Have a shop do it so they can balance it right.

Bob

firebird7980 11-14-2011 05:44 PM

sorry for the confusion the trans cross member is in the same spot trans mount bolts right up to cross member i cant tell if mount is in same spot on cross member as before because i sand blast then paint the cross member the cross member has a oval hole front to back about inch and half i ment to long on the first post

T-bucket23 11-15-2011 07:23 AM

There may also be more than 1 set of holes for the cross member. It may not be back where it was

boothboy 11-15-2011 09:57 AM

Are the mounting (holes, studs) centered on the trans mount? If not, could the mount be reversed?

firebird7980 11-15-2011 07:29 PM

It doesn't matter we're the cross member is the trans is we're it is I Can move the cross member in an spot the trans doesn't move I have the frame mount for the engine in the holes close to the radiators as far as I can tell there is three different drive shaft

T-bucket23 11-16-2011 06:28 AM

Quote:

Originally Posted by firebird7980
It doesn't matter we're the cross member is the trans is we're it is I Can move the cross member in an spot the trans doesn't move I have the frame mount for the engine in the holes close to the radiators as far as I can tell there is three different drive shaft

If the new bell was longer and the transmission is mounted further back in a different set of holes it will matter.

35terraplane 11-16-2011 11:49 AM

Drive shaft
 
Everyone is worried what holes he has put it in, why not measure the distance from the tail shaft to the rearend, then the drive shaft he has, that will tell if it fits or not. Then do what you have to to get it to fit either a longer drive shaft or a shorter one.

Bob


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