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01-20-2021, 06:15 PM
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#1 |
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Registered User
Join Date: Jun 2014
Location: Tahuya WA
Posts: 695
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Re: Help reading rear ended gears
Kind of off the subject but did they make 3:07 and 3:08 rears at the same time?
I like the teeth counting idea if necessary. |
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01-20-2021, 06:44 PM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Help reading rear ended gears
Turning the wheels and watching the drive shaft is about as close as you need. It will be dang near perfect for figuring out your gears. If it only turns 3 times you know it's not a 4:11 set!
If it turns 4 times you know it's not a 3:08 set. So with that being said if you turn it 3 1/8 times then it's got to be a 3:08. 3.07 gears were installed in automatic trucks. 3.73 gears were common in three speed trucks, and 4.11's were found with granny geared four-speed trucks. This isn't gospel seeing how my 71 has 4:11 gears and it had just a normal 3 speed in it when I bought it from the original owner. But it's the only gear sets they used back then for the common truck. 
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-20-2021, 09:01 PM
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#3 | |
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Registered User
Join Date: Jun 2014
Location: Tahuya WA
Posts: 695
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Re: Help reading rear ended gears
Quote:
I got my rear end from a green '70 longbed with an auto column shift in the salvage yard, and the numbers on the ring gear divided up into 3:07. I just thought it was a 3:08 for some reason all this time. Thanks! |
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01-20-2021, 10:54 PM
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#4 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Help reading rear ended gears
Quote:
 I want to know can you tell any difference now that you know!  
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-21-2021, 02:12 AM
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#5 | |
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Registered User
Join Date: Jun 2014
Location: Tahuya WA
Posts: 695
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Re: Help reading rear ended gears
Quote:
 ...what'd they do, add or subtract a tooth someplace? |
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