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#1 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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a little help with her rear end
Quote - DennyB from the FAQ section:
Another way is to do this is.... With an open rear (non posi)- jack up one rear wheel (please use jack stands), put the truck in netural, turn the rear wheel and count how many times the drive shaft turns. Multiply the turns of the drive shaft x2 and divide for the ratio. This is most accurate if you turn the wheel about 10 times. With a posi rear, jack up both rear wheels and turn the same way as above. use the actual drive shaft revolutions with a posi. OK, so I turned the wheel from 12 o'clock position all the way around twice (2xs) and then stopped at the 1 o'clock position - the drive shaft turned twice - exactly. I can't seem to figure out what I have here..... 2(2)/ 2.17 = 1.84?? Thanks for the help!
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"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#2 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,426
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Re: a little help with her rear end
I assume that the 2.17 is for two turns of the tire plus the distance from 12 o'clock to 1 o'clock. Shouldn't it be 2 + 1/12 = 2.083?
2(2)/2.083 = 1.92 Is it possible that maybe you only spun the tire 1 + 1/12 times around? |
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#3 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: a little help with her rear end
you are correct on the 2.083 (can't copy right today) - I spun the wheel twice plus the 1/12th - 98% sure - and there again, maybe I can't count either.... hahahah but it makes sense no? one turn of the drive shaft gets me 2+1/12th rotations at the wheel? Has this gotten to the "too messy to figure out stage?".... 1and1/24th rotation of the wheel got me 1/2 rotation of the drive shaft.....
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"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! Last edited by Luvlegs; 03-07-2006 at 04:01 PM. |
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#4 |
Jamie Hyneman is my twin
![]() Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: a little help with her rear end
The key to this system is the ten turns of the wheel. that should help with the accuracy, and give you larger numbers to put into the equation.
I would put a chalk mark on your drive shaft, and a mark on your tire, just to be sure that you are making complete turns.
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Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis |
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#5 |
Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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Re: a little help with her rear end
When was the last time you changed the differential gear lube? Now is a good time to try out that new Royal Purple Differential lube (It's Synthetic and might even get you some better gas milage and help out those gears and bearings in there, they like fresh food too) and at the same time you can find the numbers stamped on the ring gear (10:39)or you can count how many teeth you have on both the ring & pinion to get an acurate assesment instead of guessing.
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" |
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#6 |
Keepin an eye out
Join Date: Feb 2003
Location: So.Cal
Posts: 3,921
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Re: a little help with her rear end
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1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 |
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#7 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: a little help with her rear end
I'll probably be upgrading when I get to that part of the project - I don't know how well what's in there will get along with the new engine.... Just trying to get an idea of what's hiding in the 34 year ol' pumpkin.......
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"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#8 |
Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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Re: a little help with her rear end
I did not know that about a cat blinking......thanks for that info.....
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1997 GMC Sierra Ext 1965 Mustang |
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#9 | |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: a little help with her rear end
Quote:
haahaahahhah It's been a long day and I'm ready to GO HOME!!!!!!
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#10 |
Senior Member
![]() Join Date: Mar 2005
Location: weatherford,texas
Posts: 1,003
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Re: a little help with her rear end
if it's original and not been changed,the most common gear ratio's for these trucks are 3.07's or 3.73's.since your truck is a 6cyl. and a 3 speed i'll bet it's got 3.73's.if it does't have the power to get out of it's own way,then it's got 3.07's....
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