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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#68919 11/20/2006 7:17 PM | Joined: Jun 2005 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2005 Posts: 46 | I swapped the 3 speed on the column out to the floor shifted SM420 4 speed tranmission, everything bolted right back into place just like the 3 speed was, including the mount at the torque tube ball (rear transmission mount).
Now i'm working on changing the old enclosed driveshaft & rearend out to a open driveshaft & newer rearend (better gear ratio), my question is this, on our trucks, that had the open driveshafts & 4 speed (SM420) is there a rear transmission mount? By looking in the manual that I got from Chevrolet, there appears to be either a 4 point mount (motor & transmission), or a 3 point mount (motor only). So is it safe to think that the 4 speed did not have a rear mount.
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#68920 11/20/2006 9:41 PM | Joined: Sep 2005 Posts: 254 Shop Shark | | Shop Shark Joined: Sep 2005 Posts: 254 | for most trucks that have the 4spd tranny and aren't 4x4 it pretty much just has 2 engine mounts (one on each side) and another 2 mounts on the bellhousing for the tranny and no mounts for the rear/tailshaft my 55 2nd series, 70 chevys are this way also my 64 chevy with 3spd was the same
Nate | | |
#68921 11/20/2006 9:47 PM | Joined: May 2004 Posts: 920 'Bolter | | 'Bolter Joined: May 2004 Posts: 920 | No rear mount on mine. I installed an O.D. a few months back and concerned about the extra weight, I added a new crossmember mount to the adapter between the transmissions. | | |
#68922 11/21/2006 2:18 AM | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | My 51 1 Ton has one front engine mount and two side mounts on the nell housing. It has the 4 speed and the open driveshaft. | | |
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