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#419986 - October 27th 2010 12:58 pm Re: Your thoughts on a 12-bolt rear axle? [Re: Westvan71]
wookee Offline
carpal tunnel

Registered: April 14th 2003 12:00 pm
Posts: 7504
Loc: Joppa Md. U.S.A.
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

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#420005 - October 27th 2010 2:43 pm Re: Your thoughts on a 12-bolt rear axle? [Re: wookee]
Westvan71 Offline
veteran

Registered: June 28th 2006 12:00 pm
Posts: 2086
Loc: Calgary,AB
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)

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#420229 - October 28th 2010 4:52 pm Re: Your thoughts on a 12-bolt rear axle? [Re: Westvan71]
wookee Offline
carpal tunnel

Registered: April 14th 2003 12:00 pm
Posts: 7504
Loc: Joppa Md. U.S.A.
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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