Thank you! That's a great start and awesome insight to my situation! I was indeed referring to the torque converter to flexplate bolts. I'm surprised they're potentially generic! I was assuming they would be "special" with at least a really short head. I will see if I can pick up a trio of grade 8 3/8-16 x 1/2 at our local HW store.tgreese wrote: ↑Mon May 20, 2024 2:36 pm I assume you want the flex plate to convertor bolts.
The parts book says that '74-78 uses a generic bolt G9408973... fortunately for you, it also lists a size (not typical). 3/8"-16 by 1/2". In '79, they went to M10x1.5, I assume the same length.
Since it's a generic part, I'd go to the hardware store and buy some grade 5 or grade 8 bolts that size and try them.
The '74-80 factory parts book is available in paper and on digital media many places, including RockAuto and BJ's.
Fascinating, thanks for that info!tgreese wrote: ↑Tue May 21, 2024 7:25 am Yes, '79 was the last year for the TH400 in Jeeps. Late 1965 through 1979, the TH400 was the only automatic available in Jeeps. In '80 they switched to Chrysler transmissions (including an AMC-case 727), conforming to the rest of the AMC line. Lots of changes in 1980.
I did save the bolt remnants, they're really chewed up though. Starter seemed like it had a short in the windings, we got a dead short to ground anytime we had it connected and tried to crank, shocked it hadn't melted the old fusible link yet. Local parts store had a reman unit for a pretty good price with the core swap so went that route.devildog80 wrote: ↑Tue May 21, 2024 1:06 pm Get an inspection camera up through the inspection port, line up the torque converter to the flywheel mounting points, and snap some pics. This way you can see what thread and approximate size you need.
Did you save the bad chewed up bolts that came out with the starter? Always save these remnants for awhile, so you have an example of what you need/don't need, when looking for replacement parts. Starter might actually still be good too, if you got the jammed bolts out of the gear.
Thank you, yeah, I'm familiar with the SAE and Metric grade markings, the marks on what was left of the heads of these were debossed, cut into the head of it, rather than embossed like I'm used to seeing. I've seen that with older chevy flexplate and flywheel bolts but they are a special low profile head which was what made me assume the torque converter bolts were going to be some type of specialty fastener.tgreese wrote: ↑Wed May 22, 2024 8:24 am Lines on the head is a grade marking.
https://lightningboltandsupply.com/wp-c ... rength.jpg
Fantastic, I'll take a look. I am aware the Haynes / Chiltons manuals are different. The TSM I have was from Tom Collin's site but the one for '78 seems to be missing at least the wiring diagrams and the diagrams he has for '78 don't have the rear window (that I could find). I'll look around his site some more though and see what I can find in similar years. I've barely scratched the surface of his website and boy is there a wealth of information on there!tgreese wrote: ↑Wed May 22, 2024 10:08 am Parts book does not show a washer.
Parts book: https://www.rockauto.com/en/moreinfo.ph ... 10&jsn=394 Not expensive. Also available in paper, which I have.
They also have the TSMs, if the copy you have is incomplete. I would look at the electrical and manuals sections of same and near years at the Tom Collins site for the tailgate diagram.
Note that the Haynes and Chiltons manuals are not the TSM, if you did not know.
I probably have a few misc. 3/8-16 bolts laying around. I've got the metric ones out of a 700r4 that are for another project so I could at least see if the thread is correct in the TC. I've also got taps so I'm sure I can chase the threads in the TC to confirm. Just hoping to have the new parts on hand before I get back into it so it's not getting dragged out.tgreese wrote: ↑Wed May 22, 2024 12:40 pm Pack of 50 from McMaster-Carr: https://www.mcmaster.com/92620A619/
Yeah, I'd buy an ungraded 3/8"-16 bolt from the big box store to test the thread size. You'll likely need to shorten it to fit in the space available. Knowing the thread size, you can look for the proper part.
The M10 bolt for '79 has an actual part number 420 0302 which probably echoes its GM part number. The G number I gave above indicates a hardware item, not Jeep-specific.
I'm suspecting something along those lines... They needed transmission work, had the work done or did it themselves, installed the wrong bolts or forgot to tighten them, went on the test drive... at some point all 3 worked themselves loose, 2 lodging themselves in the starter nose... Vehicle of course stopped driving because nothing was connected anymore... Guy probably tried to crank, heard horrible sounds, kept cranking, engine stopped turning over. He said "Forget this!" and had it dragged home and parked it until we came along and got it.devildog80 wrote: ↑Wed May 22, 2024 11:50 am Probably need to get the bolts from auto supply, as they are not general hardware type bolts.
And was thinking the old bolts, you might be able to see thread for size of the bolt, also what thread size they are, metric or standard. But get a camera in there to see it the hole size matches the bolt size. PO might have used the wrong ones, and why they came out?
Yep. Lifetime supply. They ship fast too. "Delivers Tomorrow" at 4PM. You'd likely wait an extra week for the ARP parts.hotrod6657 wrote: ↑Wed May 22, 2024 2:00 pm ...Hilariously, that 50 pack from Mcmaster doesn't cost much more than the 3 pack from ARP haha...