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Good day by lukester - March 28th 2024 12:26 pm
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| | | Re: Your thoughts on a 12-bolt rear axle? | Joined: Jun 2006 Posts: 2,086 veteran | OP veteran Joined: Jun 2006 Posts: 2,086 | Yes, you have the same serial number 3817779 as mine. I must had write the ratio number crossed - I was reading off by the side on my left. So it looks to be the 3.07 gear. If it was meant for light 4x4 gear - how did it get there under the '75 Chevy van?
Oh well, I suppose that gear should be good for highway driving as it'd do good on gas.
Thanks Catfish!
Westvan71
1971 Chevyvan G10 panel van - going to be put for sale 1975 GMC shorty panel van - trying to fix to save her! 1963 Mercury Econoline project van - coming 1986 Ford Mustang LX hatchback - in use for commute, poor car!
“You cannot dream yourself into a character; you must hammer and forge yourself one.” James A. Froude (1818 - 1894) | | | Re: Your thoughts on a 12-bolt rear axle? | Joined: Apr 2003 Posts: 7,662 Likes: 2 carpal tunnel | carpal tunnel Joined: Apr 2003 Posts: 7,662 Likes: 2 | On older GM vans you could custom order you running gear, un like today. also on the GM 12 bolts the gear raitos can be swapped out.This involves not only the gear set them selves but the carriers also the 3:08 rear gear set I am running in my Early came out of a 79 pick up. I went from a factory 4:10 to a newer 3:08 doing this swap. The 12 bolt housing its self from 69 to 79 where the same.......
........Wookee
Its a "Van Thing" A life style you have to LIVE to understand! Vintage Chevy Van Club
| | | Re: Your thoughts on a 12-bolt rear axle? | Joined: Jun 2006 Posts: 2,086 veteran | OP veteran Joined: Jun 2006 Posts: 2,086 | Good to know I can swap ring gear and gears inside the 12 bolt housing. For now the 3.07 gear is good enough to use. The important thing is I now have 5 x 5 bolt pattern on my van - no more 4.75 by 5 size!
I also found out the ratio gears were stamped on September 1974 ... so it does match the age of the van where I got the axle, the dates looks to match all round by parts. The van obviously retain much of its original parts on it.
A shame that the van is so rusty - it was an old vanner's van. Someone swooped the fender emblems and what looks like corvette waving flags above the emblems. I can see the shadow lines on fenders.
Westvan71
1971 Chevyvan G10 panel van - going to be put for sale 1975 GMC shorty panel van - trying to fix to save her! 1963 Mercury Econoline project van - coming 1986 Ford Mustang LX hatchback - in use for commute, poor car!
“You cannot dream yourself into a character; you must hammer and forge yourself one.” James A. Froude (1818 - 1894) | | | Re: Your thoughts on a 12-bolt rear axle? | Joined: Apr 2003 Posts: 7,662 Likes: 2 carpal tunnel | carpal tunnel Joined: Apr 2003 Posts: 7,662 Likes: 2 | I like the 3:07 I am currently running in my Early. Exalent light to light performance good hi way cruising speeds and MPG arew not too bad ether........
.........Wookee
Its a "Van Thing" A life style you have to LIVE to understand! Vintage Chevy Van Club
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