How to swap an automatic to manual transmission in a 1995 GMC And no Computer I want to use one from 1973 3 on the tree tranny

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Asked by Jan 09, 2015 at 02:40 PM about the 1995 GMC Sierra C/K 1500

Question type: Car Customization

How to get a 1970's 3 on the tree stick shift transmission to work in a 1995 GMC Pickup

5 Answers

The bell-housing will have to be the same--bolt pattern and starter location. The flywheel will have to be changed, in an automatic it's a far lighter flywheel because the torque convertor bolts to it. Then the clutch pressure plate will bolt to the new, heavier flywheel. Then you will have to find a pedal assembly for clutch, cut hole through firewall and all the linkage, brackets and pivot points. Then, either swap out steering columns or much easier is get a floor shifter kit. If the transmission mount is in the wrong place, (different length total from bell-housing to rear output) some fabrication may have to be done (hopefully not, may bolt right up to old mount and crossmember. Then driveshaft length if different..but that's actually easy, a shop can shorten or lengthen, and balance a driveshaft. Last, the final drive..if way different from the auto, the Third Member may have to be made right.

1 people found this helpful.

This is flywheel for automatic

Clutch. Not exact ones but demonstrates the difference..the clutch disc must have a flat surface to 'grab'

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Update. The swap is complete. The hardest part was converting the steering column. The 95 had a bar the ran all the way across the cab. I had to remove every bit of dash and cut out almost everything. I also had to cut out a chunk of firewall out of two trucks. One from the 95 and one 86 GMC. Weld in the firewall from the 86 into the 95. I had to do this because the 3 in the tree steering column would not bolt in with a 95 set up. The transmission I used was a Saginaw M26 from a 1973 C-10. The steering column from the same truck. I also used the manual brake system and kept it manual steering. No power for me.

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It runs and drives well just needs body work and paint. Then it will be ready for the car shows.

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