C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

how to remove driveshaft??

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Old Jun 23, 2004 | 03:46 PM
  #1  
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Default how to remove driveshaft??

85 4+3
i wana change u joints in the main shaft..what needs to be removed to access it??any one know??
hoping it isnt a major project
Old Jun 23, 2004 | 03:48 PM
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Default Re: how to remove driveshaft?? (dannydoo)

Probabky jus drop the exhaust, then losed the bolts that hold the drive shaft in. Usually pretty easy. Unless you exhaust bolts are rusted and fused together.
Old Jun 23, 2004 | 03:51 PM
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Default Re: how to remove driveshaft?? (dannydoo)

USUALLY!!!
the exhaust is the only thing?that needs to move? i was hoping it could fit w/out that
thanx
Old Jun 23, 2004 | 04:17 PM
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Default Re: how to remove driveshaft?? (dannydoo)

Here's the official sequence from my '88 GM Shop Manual:
-remove the exhaust system as an assembly
-support the transmission
-remove the drive line support beam
-mark the relation ship of the drive shaft to companion flange at each end
-disconnect the rear U-joint by removing trunion bearing straps
-slide slip yoke from transmission and remove the drive shaft

From there it's pretty standard to replace the U-joints.
Old Jun 23, 2004 | 04:27 PM
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Default Re: how to remove driveshaft?? (65Z01)

thats more like it..thanx...in any other car it would be a 20 minute job..it sounds like its gonna be about 4 hours cinsiderin the rusty bolts and torch work probaly...
oh boy fun fun fun
Old Jun 23, 2004 | 05:06 PM
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Default Re: how to remove driveshaft?? (dannydoo)

I've found that PB Blaster works wonders on those rusty bolts.

I've heard it can be a bear to get at the top-located nuts holding the C-beam in place though.
Old Jun 23, 2004 | 05:20 PM
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Default Re: how to remove driveshaft?? (dannydoo)

and torch work probaly...
Shouldn't need it. If you decide to try it becareful as the driveshaft is only aluminum as well as other pieces and the tranny tunnel melts easily.
Old Jun 23, 2004 | 05:24 PM
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Default Re: how to remove driveshaft?? (dannydoo)

Anyone have an online source or link for PB Blaster?
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Old Jun 23, 2004 | 05:29 PM
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Default Re: how to remove driveshaft?? (scorp508)

Also, I was able to to remove mine without pulling the support beam. I removed the 2 bolts on the tranny end and loosened the 2 at the rear end. There was enough slack between the driveline, c-beam and tunnel to get it out.
Old Jun 23, 2004 | 09:36 PM
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Default Re: how to remove driveshaft?? (ittlfly)

Hey,

I got mine out with just taking out the rear hangers and letting the exhaust hang (with a jack supporting it). Then slide out the driveshaft. It was harder to put back.

Good luck,

Steven
Old Jun 23, 2004 | 09:39 PM
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Default Re: how to remove driveshaft?? (dannydoo)

Not sure about the 86, but my 84 I did not have to remove the drive line support beam.
Old Jun 24, 2004 | 12:52 AM
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Default Re: how to remove driveshaft?? (dannydoo)

i remember briefly lookin at it and thinking if i move the exhaust i should be able to get it...thanx for all the ideas...im gonna drop the hangers first to see iif theres enough room..if not ill rape the the exhaust...but first ill look at the two bolts on the rear and tranny...if i loosen those does the c-beam still gotta come out?AND is tranny fluid gonna **** out?4+3 who knows!!!!
Old Jun 24, 2004 | 01:13 AM
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Default Re: how to remove driveshaft?? (vsocks)

Pep Boy, Kragen, NAPA
Old Jun 24, 2004 | 10:08 AM
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Default Re: how to remove driveshaft?? (dannydoo)

AND is tranny fluid gonna **** out?4+3 who knows!!!!
As long as your rear seal in the tranny is good it shouldn't. Mine has never oozed a drop out the back when pulling the driveshaft.
Old Jun 24, 2004 | 06:01 PM
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Default Re: how to remove driveshaft?? (scorp508)

Took me a hour to drop the exhaust. One of the hangers at the trans is welded to the pipes, so I had to disconnect it from the trans.

Took me 2-3 hours to heat up and remove the studs I broke off in the manifolds. Busted 4 out of 6.
Old Jun 28, 2023 | 12:46 PM
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Default

(2) 18mm bolts in the front and (2) 21mm bolts in the rear i believe... box end wrench resting securely against body on top... breaker bar below followed by ratchet... sounds good on paper LOL! If you can afford the custom fitted bolt kit Van Steel Corvette Suspension Specialists sells them for $99 each (total cost = $198) That's it!
Old Jun 29, 2023 | 04:58 PM
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OP hasn’t been active on the Forum for nineteen years. Hopefully he solved his problem. Thread closed.

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