740 Rear Driveshaft Interchangeability

maxitoman007 · 03-19-2020, 11:20 PM

Hello, I recently broke the rear driveshaft in my 1987 740 turbo manual wagon. I’m wondering which vehicles have driveshafts I could use as a replacement. I pulled a rear driveshaft from an N/A automatic 740 and it is too long combined with having a smaller spline count. Any help is appreciated, thanks.

DET17 · 03-20-2020, 08:07 PM

I have been told all the 7/9 rear half shafts are identical. PM 2manyturbos, he knows for sure.

Lankku · 03-20-2020, 08:54 PM

There are at least three bypes of driveshafts. Small, big and inverted spline.

Not sure if the older models with different bearing support had driveshaft halves with different lenghts. And if only those cars had also small spline.

MasterBlaster · 03-21-2020, 02:41 AM

How "broke"?
The driveshaft tube is twisted like a pretzel?
One of the cast iron yokes actually broke?
One of the easily replaceable u-joints fell apart?

sbabbs · 03-21-2020, 03:02 AM

The IRS 7 and 9 series cars the rear half of the drive shaft is a little bit different length. I can't remember if it's longer or shorter then the solid axle cars but when I put a m47 in a 780 bertone I just swapped the front section.

maxitoman007 · 03-22-2020, 02:54 AM

Quote:

Originally Posted by MasterBlaster

How "broke"?
The driveshaft tube is twisted like a pretzel?
One of the cast iron yokes actually broke?
One of the easily replaceable u-joints fell apart?

Snapped a torque rod and bent the subframe. It was so bent it was hitting the rear yoke on the diff. The yoke eventually gave.

Managed to find a matching driveshaft from another 740 turbo.

03-19-2020, 11:20 PM	#1
maxitoman007 Board Member Join Date: Feb 2017 Location: Calgary, Alberta, Canada	740 Rear Driveshaft Interchangeability Hello, I recently broke the rear driveshaft in my 1987 740 turbo manual wagon. I’m wondering which vehicles have driveshafts I could use as a replacement. I pulled a rear driveshaft from an N/A automatic 740 and it is too long combined with having a smaller spline count. Any help is appreciated, thanks.

03-20-2020, 08:07 PM	#2
DET17 Reformed SAABaholic Join Date: Nov 2009 Location: NW Georgia	I have been told all the 7/9 rear half shafts are identical. PM 2manyturbos, he knows for sure. __________________ Project "cheap thrills" build thread: http://forums.turbobricks.com/showth...67#post4211467 Feedback thread: http://forums.turbobricks.com/showthread.php?t=198746

03-20-2020, 08:54 PM	#3
Lankku Board Member Join Date: May 2015 Location: Finland	There are at least three bypes of driveshafts. Small, big and inverted spline. Not sure if the older models with different bearing support had driveshaft halves with different lenghts. And if only those cars had also small spline. __________________ 444 -55, 242 DL -80 (was 4.6l)sold, 245 -88 "B6284T" sold, 245 -92 "B6284T", 245 -90

03-21-2020, 02:41 AM	#4
MasterBlaster Board Member Join Date: Feb 2009 Location: Port Coquitlam	How "broke"? The driveshaft tube is twisted like a pretzel? One of the cast iron yokes actually broke? One of the easily replaceable u-joints fell apart? __________________ 1990 740GL 534,000 km so far...

03-21-2020, 03:02 AM	#5
sbabbs Board Member Join Date: Dec 2006 Location: Rushing Lane, Scappoose, OR	The IRS 7 and 9 series cars the rear half of the drive shaft is a little bit different length. I can't remember if it's longer or shorter then the solid axle cars but when I put a m47 in a 780 bertone I just swapped the front section. __________________ 1988 245 White slicktop M47 Wagon! 93 b230f. LH 2.4 STS flat flywheel. 1990 745 B230FT Getrag JohnV flywheel 240mm clutch 13c A-cam 3.54 G80 548K 1991 740SE B230FT NPR Strut braces IPD bar A cam 550cc EV14's. 3.73 G80 M90 to put in. 1995 940 White racing wagoon. 13c m90 to put in

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