Mudsport96
Full Access Member
Toss some 4.56s in the diffs and she will boogey.
LM7 engine build
- Thread starter mofokriss
- Start date
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Funny you mention that. Today I was replacing the diff cover gasket bc of a leak and it turns out the leak wasn't from the gasket at all.
Yea a hairline crack will cause fluid to spill out
Now it's got me thinking. Upgrade/replace cover only or just throw some 4.10s and call it a day
Mudsport96
Full Access Member
Hiw much highway do you do, and what size tires do you have?
I do a fair amount of freeway driving. Go to different cities and road trips. Not so much city driving. Was running a 32" 305/50/20 goodyear eagle gt2s most of its life. I stepped it down to 285s tho which is a 30.5-31" tire I believe. Today I received new rear coils from summit racing. Since the cam swap, and trans tune, whenever I go WOT the burb likes to do the shoulder lean after the 1-2 shift
Mudsport96
Full Access Member
285/70r16 31.7 inches
285/75r16 32.8 inches
285/70r17. 32.7 inches
285/75r18 33.8 inches
Since you said close to 31s im guessing you have the285/70s on 16 inch wheels.
If that is the case i would probably think about 4.11s as at 70 you would still have a reasonable rpm of 2150ish
If you had any of the others, that are over 32 inches, i wouldn't hesitate to go right to the 4.56s. You would be in the 2300ish rpm range at 70 and my old 90s ford work truck runs that every day. So a 5.3 wouldn't care at all.
285/75r16 32.8 inches
285/70r17. 32.7 inches
285/75r18 33.8 inches
Since you said close to 31s im guessing you have the285/70s on 16 inch wheels.
If that is the case i would probably think about 4.11s as at 70 you would still have a reasonable rpm of 2150ish
If you had any of the others, that are over 32 inches, i wouldn't hesitate to go right to the 4.56s. You would be in the 2300ish rpm range at 70 and my old 90s ford work truck runs that every day. So a 5.3 wouldn't care at all.
Sorry for not being more specific. I went from 32" (305/50/20) to a 31.3" (285/50/20) tire. Also I've been working 14 day 10-11hour days straight and haven't been able to work on any of my cars or be on the forum. I will be on the lookout for some 4.11s for sure. Until then I will just JB weld the crack
Just want to show my appreciation to all those that have viewed my build, enjoyed it and there's more to come. Not bad for your average car enthusiast to dive in like this and not bad for the lil old 260k engine that keeps on churnin! Goes to show that proper maintenance will make an engine last. Even with all the abuse she gets and happy Monday!!!
So after trying out my new Mechman Alternator, I decided to run my audio system full tilt today. And I ended up paying a price for it. I didn't think I was at that tier yet to where I break glass. Won't be doing that again I hope. any suggestions to be able to run full bass without glass shattering? Windows were opened when i did bumped it up. Car doesn't rattle 
Sam Harris
Supporting Member
Got the glass replaced today. Window replacement dude said reason that it cracked and the other side didn't was bc the glass wasn't tinted. Lol. To a degree, he says the tint helps keep the glass more together to combat the vibration of frequencies. The other side was tinted. I never got the chance to tint this side because it got replaced recently when a kit threw his baseball at the window getting a tint to match asap. How much truth is there to what he said? I won't know... what you guys think? Myth? BS? Logical, kinda?
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