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Mod | | | Forums66 Topics128,026 Posts1,055,406 Members48,422 | | Most Online14,466
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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| | | | Joined: Feb 2018 Posts: 116 Shop Shark | | Shop Shark Joined: Feb 2018 Posts: 116 | Hey everyone! Its been a while since I was on here last. I need the community's help here. I installed a GMC 270 with the SM420 into my 1948 Chevy 6100. After I installed the engine/clutch/xmsn; The clutch wouldn't engage/disengage the xmsn from the motor. I depressed the clutch pedal as far as its travel allowed and the motor still spun the xmsn with full torque. Any ideas? | | | | | Joined: May 2017 Posts: 330 'Bolter | | 'Bolter Joined: May 2017 Posts: 330 | I would guess you have the wrong throw out bearing assembly. I believe there are at least 3 choices. The type of clutch determines the correct length. That's true with the mid fifties and later, I don't know the details about exactly what fits the 48.
Mac :{)
1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
| | | | | Joined: Feb 2004 Posts: 29,748 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,748 | You probably have the clutch disc installed backwards. The center hub of the disc has several damper springs in it. The side of the disc where the damper springs stick out the furthest needs to go back inside the pressure plate. If the springs are installed toward the flywheel, they drag on the flywheel attaching bolts and don't let the clutch release fully.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Feb 2018 Posts: 116 Shop Shark | | Shop Shark Joined: Feb 2018 Posts: 116 | Thank you! I bet that is what is wrong! I'm going to take it all apart tomorrow and check! | | | | | Joined: Feb 2018 Posts: 116 Shop Shark | | Shop Shark Joined: Feb 2018 Posts: 116 | Thank you for the advice! I pulled everything apart. Turns out that I did have the friction disk in backwards. All is reinstalled in the proper orientation. Thanks! | | | | | Joined: Dec 2015 Posts: 2,062 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,062 | | | |
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