I am missing a bolt on my car. I thought the I had the proper size ordered off of Ebay. I didn't. Its supposed to be a 904, I purchased bolts for a 904. Bolts didn't fit. Anybody know what size I need?
Missing screw can somebody eyeball the proper size?
- Thread starter Kipprc
- Start date
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Lol, I wish I knew. I foolishly ordered the bolt off of ebay. Just said 904 transmission bell housing bolts. They are too small. They look big enough, but they can fit or pass through hole with ease.
The bag says GM10040.
Rakers_SS
Well-Known Member
I've been using this and have recommended it to several other members as well. Although not the cheapest solution ($25), its an incredibly handy tool to have around! I usually use this to find the size I need then run to home depot/lowes/ace hardware to get the proper bolt.
https://www.amazon.com/dp/B003FJW0GK/?tag=fabo03-20
https://www.amazon.com/dp/B003FJW0GK/?tag=fabo03-20
I'm thinking 7/16" also. And you're correct, no threads. I've R &R'd mine about a dozen times in the last 6 months!!!
Mine has the bracket that holds both transmission lines. Other than that, not really sure why it's needed.
Mine has the bracket that holds both transmission lines. Other than that, not really sure why it's needed.
a 7/16 head is 1/4 thread size , 1/2 hex head is 5/16 thread , ect...... no one call a bolt or screw by its head size its the threads thats the part that threads in . i would say 1/4-20 x 1/2 to 5/8 in length will do , or a valve cover bolt .
Correct. Thread size is 7/16" IIRC.
Missing the little cover plate too
Cover smother...
67Dart273
Well-Known Member
You wish you knew!!! Why can't you measure them?
I have measured screws before and for whatever reason what I measured turned out to be the wrong size several times. Now I'm gun shy about it and usually defer to what info I can find online. This time it didn't work.
Blind Squirrel
Well-Known Member
You need a tap and die set. They can be used to identify correct bolt and nut sizes also.
67Dart273
Well-Known Member
You need to remedy this. This is part of mechanics 101, week 2, day 3. First thing final bell 9AM. Buy yourself a caliper. Buy yourself a 01" "mike." They are not expensive with all the Chineseoatiized junk available. Also, various fastener shops have plastic "go no go" gauges to fit bolts into and figure out what they are. And you need a thread gauge. I'm 72, I owned my first dial caliper (Sears) in 1970. Lately, I've bought SEVERAL vernier calipers. These are all Sears/ Craftsman, made in Germany, "old stuff' bought used on Egag. There are no gears to strip, and no batteries. I have to use a magnifier to see them.
Bolt and nuts stores use these types of things. This was a very quick search, just for an example
https://www.amazon.com/dp/B0098JILSW/?tag=fabo03-20
I have one for metric that I have used several times. These were standards. There have been several suggestions in this thread that I am going to follow up on. A standard tap and die will be is number 2 on the list.
doug 371
Well-Known Member
Those holes are for engine to trans support bars...looks like youre not using them so you probably don't need them...
I was thinking the same but wasn't sure. Thanks for clearing up the mystery!!
that's the hole for the transmission / engine bracket that almost no one re-installs. you can use whatever bolt you want as long as it doesn't fall out. but you can leave it open too if your not putting the bracket back
CudaFactHackJob
Well-Known Member
Mr. Whitworth might disagree..
whitworth is brit threads .
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