Flexplate/Tranny Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

harnalien · 04-01-2011, 01:53 PM

Ok, I'm trying to keep things moving forward. I mocked up my flexplate and was wanting to confirm that I have to make the holes in the GM 12621399 flexplate kit longer/bigger. The holes I am referring to are circled in red. Do I just drill those wider? Also, how much did I screw myself; I took my old engine out and had my transmission jacked up. Long story short, the the tranny slipped and fell forward and that is why it is so far away from the firewall. I tried to push it back into place, but can't seem to get it to budge. I didn't give it a great amount of effort because I didn't want to mess anything up. Can I just push it back into place or am I totally screwed? Thanks for any help.

usmcchevy · 04-01-2011, 02:59 PM

Flexplate looks like you need to enlarge the holes.

http://67-72chevytrucks.com/vboard/s...d.php?t=455803

Trans must just be caught on something. Yolk still in the trans or did it slip out?

harnalien · 04-01-2011, 03:16 PM

It's still together. I See a little "new" metal on the drive shaft frOm where it slipped forward, but I just didn't give it a lot of effort pushing it forward because I didn't know if I was screwing up. I will make the holes bigger then, thanks!
Posted via Mobile Device

04-01-2011, 01:53 PM	#1
harnalien TruckincrazY Join Date: May 2004 Location: Haslet, TX Posts: 493	Flexplate/Tranny Question Ok, I'm trying to keep things moving forward. I mocked up my flexplate and was wanting to confirm that I have to make the holes in the GM 12621399 flexplate kit longer/bigger. The holes I am referring to are circled in red. Do I just drill those wider? Also, how much did I screw myself; I took my old engine out and had my transmission jacked up. Long story short, the the tranny slipped and fell forward and that is why it is so far away from the firewall. I tried to push it back into place, but can't seem to get it to budge. I didn't give it a great amount of effort because I didn't want to mess anything up. Can I just push it back into place or am I totally screwed? Thanks for any help. Attached Images __________________ My build thread - '84 2wd w/ a 6.0 swap http://67-72chevytrucks.com/vboard/s...d.php?t=433595

04-01-2011, 02:59 PM	#2
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: Flexplate/Tranny Question Flexplate looks like you need to enlarge the holes. http://67-72chevytrucks.com/vboard/s...d.php?t=455803 Trans must just be caught on something. Yolk still in the trans or did it slip out? __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

04-01-2011, 03:16 PM	#3
harnalien TruckincrazY Join Date: May 2004 Location: Haslet, TX Posts: 493	Re: Flexplate/Tranny Question It's still together. I See a little "new" metal on the drive shaft frOm where it slipped forward, but I just didn't give it a lot of effort pushing it forward because I didn't know if I was screwing up. I will make the holes bigger then, thanks! Posted via Mobile Device __________________ My build thread - '84 2wd w/ a 6.0 swap http://67-72chevytrucks.com/vboard/s...d.php?t=433595

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