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#75073 03/19/2007 9:34 PM | Joined: Apr 2006 Posts: 87 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 87 | i have a 10bolt axle here i was going to use for my 49 rear end the gears work out 3.23 now with a 200hp motor 5 speed o.d manual and 235x75x15 tyres would this be any good? i was thinking i may need it lower?
main uses are daily driving but need it to get up and go if i stomp on it climb hills with ease minimal highway driving cruise at an easy 60-70 would be nice
also how do i tell wich type 10 bolt it is 8.2 etc etc incase i need new gears | | |
#75074 03/19/2007 9:49 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | What engine are you running in it? Sounds a little high but it depends on the engine. I run 3.08 in my 70 stepside with 77-4R & 350 engine & it works just right. Same size tires.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#75075 03/19/2007 11:18 PM | Joined: Apr 2006 Posts: 87 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 87 | hi wrench
motor is a german gm 3.0 straight 6 twincam injection 204 hp and 200lb torque at around 5k
manual 5 speed box 4th is 1.1 5th is o.d | | |
#75076 03/19/2007 11:36 PM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | So are you saying the gearing works out to be 3.23 in OD? Or, is that the rear end ratio? | | |
#75077 03/19/2007 11:36 PM | Joined: Apr 2006 Posts: 87 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 87 | sorry max torque is 360 not 5000 i guess best check the donor cars axle ratio and tyre diameter
then work out something similar using taller truck wheels wich should need a lower ratio? | | |
#75078 03/19/2007 11:48 PM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Well it depends on your overdrive ratio, but it sounds you are more on the economy side. Overdrives typically work well with 3.73s, but can be ran with lower or higher gears. A .73 overdrive would turn 3.73s into 2.73s. You are also running pretty tall tires, which is another thing to factor in. | | |
#75079 03/20/2007 6:55 PM | Joined: Apr 2006 Posts: 87 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 87 | yes my 10 bolt donor axle is 3.23 the o.d 5th is about .72 | | |
#75080 03/20/2007 8:11 PM | Joined: Apr 2005 Posts: 275 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 275 | In my '55 Bel Air I have a 292" six & a std. trans. with a top O.D. ratio of 0.73. Behind this I have a 3.08 axle gear & 205/75/R15's. This is in my daily driver, avg. 12K. mi./yr. Only real way to know on your own is run it & experiment. I have 3 other ratios, all lower, that I've ran in past years but this works good for me. If you get to a place where top gear is too high, downshift. If low gear is too high, its definitely time for a change. Doug | | |
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