What factory gear ratio's were offered in 64?
03-02-2012, 02:58 PM
#1
Burning Brakes
Thread Starter
What factory gear ratio's were offered in 64?
Looking on line one source says 3.70, another says 3.31, another offered 3.08 as an optional gear. What was the standard offering with the powerglide? The 4 speed? The info on the net leads to more confusion... 
03-02-2012, 03:38 PM
#2
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with a powerglide you got a 3.08 and a 4 speed I think 3.36 was standard. while the 3.08,3.73, 4.11, and 4.56 optional. for a 4 speed
03-02-2012, 03:51 PM
#3
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With Powerglide (only available with the 250 and 300hp engines), 3.36 was standard, 3.08 was optional (many published charts are incorrect).
3 & 4-speeds with 250 and 300hp engines had 3.36 standard, 3.08 was optional.
With the 365 and 375hp engines, 3.70 was standard with 4-speeds, with 3.08 to 4.56 optional (3.08, 3.36, 3.55, 4.11, 4.56). Those two engines were also available with 3-speeds, although few were sold; with that combination, 3.36 was the only axle available.
03-02-2012, 04:04 PM
#4
Burning Brakes
Thread Starter
Depends on the engine.
With Powerglide (only available with the 250 and 300hp engines), 3.36 was standard, 3.08 was optional (many published charts are incorrect).
3 & 4-speeds with 250 and 300hp engines had 3.36 standard, 3.08 was optional.
With the 365 and 375hp engines, 3.70 was standard with 4-speeds, with 3.08 to 4.56 optional (3.08, 3.36, 3.55, 4.11, 4.56). Those two engines were also available with 3-speeds, although few were sold; with that combination, 3.36 was the only axle available.
With Powerglide (only available with the 250 and 300hp engines), 3.36 was standard, 3.08 was optional (many published charts are incorrect).
3 & 4-speeds with 250 and 300hp engines had 3.36 standard, 3.08 was optional.
With the 365 and 375hp engines, 3.70 was standard with 4-speeds, with 3.08 to 4.56 optional (3.08, 3.36, 3.55, 4.11, 4.56). Those two engines were also available with 3-speeds, although few were sold; with that combination, 3.36 was the only axle available.
thanks for the responses! So my 64 300hp powerglide car had either a 3.36 or a 3.08... I am going to "count the rotations" but is there anymarking on the case to tell what it came from the factory with?
03-02-2012, 04:12 PM
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03-03-2012, 08:24 AM
#6
Burning Brakes
Thread Starter
going to climb under the car this morning.. is there a list of differential codes somewhere online? (i found vin decoders and engine decoders but nothing on the diff.. )
03-03-2012, 10:27 AM
#7
Melting Slicks
For 64 model year, a 3.36 ratio had the codes CA (open ) & CB (Posi)stamped on the lower edge of the carrier.
CC-3.55 Posi 4 Speed
CD-3.70 Posi 4 Speed
CE- 4.11 " " "
CF- 4.56 " " "
CJ- 3.08 " " "
CX- 3.70 Open 4 Speed
CZ- 3.08 Open - 4 Speed
CC-3.55 Posi 4 Speed
CD-3.70 Posi 4 Speed
CE- 4.11 " " "
CF- 4.56 " " "
CJ- 3.08 " " "
CX- 3.70 Open 4 Speed
CZ- 3.08 Open - 4 Speed
Last edited by Donald #31176; 03-03-2012 at 10:32 AM.
03-03-2012, 10:31 AM
#8
Burning Brakes
Thread Starter
Mine says "CA6 15 64" so 3.36 open eh? I assume 15 64 is the date. According to the vin my car was built on June 19th. Would this code work with that assembly date?
03-03-2012, 10:40 AM
#9
Melting Slicks
03-03-2012, 10:45 AM
#10
Burning Brakes
Thread Starter
thanks! that would seem about correct for my build date, will a posi bolt in to this rear oe would i need a new housing. I read in another thread the 63-64 rears wen't as strong as the 65-79 units. is that correct?
03-03-2012, 10:55 AM
#11
Melting Slicks
I believe you would need a Posi Carrier unit to convert to posi. I dont know if the later units are compatible to the early units. Gary Ramalldi (sp) would be the person who would know as he has a reputation for building some very stout units.
03-03-2012, 11:02 AM
#12
Tech Contributor
Gary Ramadei (GTR1999), former forum poster and huge resource in rear and steering restoration.
Some links with info
http://forums.corvetteforum.com/c1-a...osi-units.html
http://www.vettemod.com/forum/showth...3357#post23357
http://forums.corvetteforum.com/c1-a...from-gary.html
Last edited by 62Jeff; 03-03-2012 at 11:05 AM.
