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Started by Cooter, November 05, 2009, 01:50:44 PM

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Cooter

November 05, 2009, 01:50:44 PM
Does anybody here know the length of an A-Body Straight shift drive shaft for a Big Block, 4-speed car?

Shortened mine for an automatic, now want my 4 gear back...
" I have spent thousands of dollars and countless hours researching what works and what doesn't and I'm willing to share"

John_Kunkel

#1
November 05, 2009, 04:35:09 PM

From the '68 parts book:

B2 with 8 3/4" axle, 833 4-speed and 340/383 engine the shaft is 48.60" long, 2 3/4" in diameter with 7290 u-joints. Automatic is 44.88" and 3" diameter.
Pardon me but my karma just ran over your dogma.

Cooter

#2
November 05, 2009, 05:03:09 PM
Thanks John.
" I have spent thousands of dollars and countless hours researching what works and what doesn't and I'm willing to share"

62 Max

#3
November 06, 2009, 08:24:23 AM
Quote from: John_Kunkel on November 05, 2009, 04:35:09 PM

From the '68 parts book:

B2 with 8 3/4" axle, 833 4-speed and 340/383 engine the shaft is 48.60" long, 2 3/4" in diameter with 7290 u-joints. Automatic is 44.88" and 3" diameter.

John,why do you suppose they would use a longer/smaller diameter shaft in a 4spd car than an auto? I've seen just the opposite in some other applications. :shruggy:

Cooter

#4
November 06, 2009, 12:26:51 PM
Quote from: 62 Max on November 06, 2009, 08:24:23 AM
Quote from: John_Kunkel on November 05, 2009, 04:35:09 PM

From the '68 parts book:

B2 with 8 3/4" axle, 833 4-speed and 340/383 engine the shaft is 48.60" long, 2 3/4" in diameter with 7290 u-joints. Automatic is 44.88" and 3" diameter.

John,why do you suppose they would use a longer/smaller diameter shaft in a 4spd car than an auto? I've seen just the opposite in some other applications. :shruggy:

I know why the shaft is longer, but not why it's smaller..The A-body 4-speed is shorter than the 727, but wonder why smaller?...Hmmmmm...
" I have spent thousands of dollars and countless hours researching what works and what doesn't and I'm willing to share"

62 Max

#5
November 06, 2009, 08:19:03 PM
Quote from: Cooter on November 06, 2009, 12:26:51 PM
Quote from: 62 Max on November 06, 2009, 08:24:23 AM
Quote from: John_Kunkel on November 05, 2009, 04:35:09 PM

From the '68 parts book:

B2 with 8 3/4" axle, 833 4-speed and 340/383 engine the shaft is 48.60" long, 2 3/4" in diameter with 7290 u-joints. Automatic is 44.88" and 3" diameter.

John,why do you suppose they would use a longer/smaller diameter shaft in a 4spd car than an auto? I've seen just the opposite in some other applications. :shruggy:

I know why the shaft is longer, but not why it's smaller..The A-body 4-speed is shorter than the 727, but wonder why smaller?...Hmmmmm...

Know about the length difference,was actually wondering about diameter .
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