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Jul 21st, 2025 | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | Hi, I was hoping someone has an SM420 laying around and could measure from the front of transmission to centerline of shift tower. My SM465 measures 5 1/2". The SM420 is 10 1/2" overall, and the SM465 is 12"long. ( http://advanceadapters.com/resources/964/Manual-Transmissions.html) Just trying to get an idea of shifter hole location with added length of OD unit. Thanks. Pete | | | | | Joined: Oct 2010 Posts: 111 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 111 | Pete
Have one in the shop - can measure it tomorrow.
| | | | | Joined: Jan 2002 Posts: 2,254 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,254 |
Dennis
-there is nothing stronger than the heart of a volunteer-
| | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | Dennis, I'll be using one of these Overdrives from Advance Adapters. Goes between Bellhousing and transmission. Moves everything back 7 3/8" (they say 7 1/2") see: http://advanceadapters.com/product/1941/760002M-27.htmlNote: Cheaper thru Summit Pete | | | | | Joined: Jan 2002 Posts: 2,254 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,254 | Thanks.
Would this be cheaper and easier than rear gears from Patrick's?
It shows to be 80 pounds. Would a brace be needed?
And the shifter would be pushed back. Are you going to modify the shifter or simply have the shifter closer to the seat?
Thanks for the information.
Dennis
-there is nothing stronger than the heart of a volunteer-
| | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | Thanks.
Q. Would this be cheaper and easier than rear gears from Patrick's?
I have a 1 ton so I'm not going to find gears too easily.
Q. It shows to be 80 pounds. Would a brace be needed?
Advance Adapters advised going to a crossmemnber and avoid the bellhousing mount.
Q. And the shifter would be pushed back. Are you going to modify the shifter or simply have the shifter closer to the seat?
Truck will have separate seats but probably still need to do something to lever.
Thanks for the information.
Sorry this took so long. | | | | | Joined: Jan 2002 Posts: 2,254 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,254 | Thanks for the reply.
I wish you the best with your project
Dennis
-there is nothing stronger than the heart of a volunteer-
| | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | 4 1/2 inches back from the bellhousing. | | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | 4 1/2 inches back from the bellhousing. Thanks for the measurement. Looks just swapping the SM-465 in place of a 420 moves lever back 1", plus the 7 1/2" for the OD unit. Now I'll have to see how putting in a 292 effects driveline location. Pete "Measure several times, cut once. I hope!" | | | | | Joined: Nov 2000 Posts: 1,927 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 1,927 | I followed the link to the advance site. Very interesting item. At 27% reduction that's a nice O/D. I did not see the price on that page. How do I see the price? I also saw that they are saying out of stock until 12-1-10. Do they offer that with the smaller bearing retainer to fit in front of a SM-420?
Good luck. Keep us informed about how this works in your Panel truck. Oh, and pictures! We love pictures.
Professional Novice
| | | | | Joined: Mar 2010 Posts: 10 New Guy | | New Guy Joined: Mar 2010 Posts: 10 | Excellent, You've inspired me!
Been looking to do same. Several months back, I snagged a Power Torque Industries cast iron version of this OD unit with thought of also placing in front of my SM420. I have the add'l task of re-swapping back in my 3.90 ring/pinion.
How did you go about modding the driveshaft?
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