Tranny belhousing bolts WHAT GRADE?

[Mudstud]

What grade should the bellhousing bolts be?

 

[milspecjimmy]

i use grade 8 only

 

[Can Can]

Like milspec said above, whenever possible Grade 8 bolts should be used for ALL applications unless otherwise specified. Grade 8s only cost a little more, anyways.....

 

[HarryH3]

The stock bolts are lower grade, but using Grade 8 stuff isn't a bad idea. I can only think of 3 places that the factory uses Grade 8 hardware. Flywheel/flexplate bolts, ring gear bolts, and seat belt bolts. But when you build 10 million vehicles a year, then saving 10 cents per bolt adds up to some serious coin! /forums/images/graemlins/shocked.gif

 

[milspecjimmy]

while putting the 600+ hp motor in the corvette this weekend we had this very discussion. what it came down to was do you want to destroy a $13,ooo powertrain because you cheaped out and spent $4 bucks on bolts, or 12 on the good ones. WE SPENT THE EXTRA /forums/images/graemlins/deal.gif

 

[imiceman44]

Actually automotive grade is higher than grade 8, it's more like grade 10.
In some body parts they use lower grade but in mechanical parts they always use the highest grade.
If you go to NAPA you could get them, but they are more expensive than grade 8 and cheaper than ARP.
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[the professor]

Don't realy need G8, unless your in a "high stress area"
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G8 bolts, should have a lock washer...cause they will probably come loose...maby not if bolting alum...
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One reason the jap cars and bike stay together, is they use cheap, soft bolts..that stretch and stay tight...
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G5 is plenty...(3 marks)...and will stay tighter...
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[milspecjimmy]

hmm if it stretches, i sure dont want it on my rig, unlese its supposed to be a weak link, and even so that is what the blue locktite is for

 

[ZonkRat]

Another line of thought.For a straight pull go with grd 8.For side loading a lower grd bold will deform {stretch}before it shears.Grd 8 will break under side load first.Used to work in metalurgy lab and the direction of load makes a difference.I use grd 8s for 99% of things.Catapillar bolts are some of the strongest around.Using soft washers on grd 8s actually makes it harder to break them because the washer absorbs the shock loadingand with hard bolts always use washers. /forums/images/graemlins/confused.gif /forums/images/graemlins/grin.gif

 

[Mudstud]

So, you're saying we shouldn't use gr8 for things like leaf springs because that is a side load application? Use gr5 instead?