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1958 chevy truck rearend

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1958 chevy truck rearend

lhs70 lhs70
New User | Posts: 12 | Joined: 03/13
Posted: 04/29/13
04:59 AM

my 58 chevy truck seems to top out at around 45-50 mph, was told the rear end is why likely a 4:56 gears... does this sound right?  and if I changed rear end what would it best?  

waynep712222 waynep712222
New User | Posts: 48 | Joined: 04/13
Posted: 04/30/13
08:51 AM

taller rear tires is the CHEEPEST  way to fix this...

something in the 31" to 34 inch tall area..  you don't have to go wide.. just taller.

my mothers pickup had 27 inch tall tires with 4:56 gears we put some non existent any more 31 10.5 /16.5s on it and it was a TOTALLY different pickup truck...

i have a ford van with 4;11 gears... as 16,5 tires are only decently available in sizes like 33/12.5-16.5 and larger... i did not want to go that far...
so i junk yarded some later mid 90s ford 16 inch rims and went to a 235/85-16 or something like that..  way different..  only issue is it made it too tall to fit in most underground garages.. i have had to let the air out twice to escape so far..

i don't recall what model your 58 chevy is... C10... C20... i won't have time to go back and look right now..

if you want to look at tire size.. the tirerack site is a good place to research... as there is a tire specs tab..  that gives you tire widths and Heights..  and most important.. how many turns per mile..

place a chalk mark at the center bottom of the side wall..  mark it on the ground also... roll forward until the mark is down again... place another mark on the ground... measure between the lines..   divide that number in inches by how many inches there are in a mile... 63,360

that will give you how many revs per mile your tires are turning so you have a base line..

one last thing..   if you have something like an RV cam... i have issues with those running out of steam at todays highway speeds...  

waynep712222 waynep712222
New User | Posts: 48 | Joined: 04/13
Posted: 04/30/13
09:00 AM

a 27" tall tire spins 754 turns per mile on a calculator  3400 at 60 mph

a 33" tall tire spins 615 turns per mile on a calculator.. 2800 at 60 mph...

a huge difference...

this is on my calculator... but real world is close...