adillac offered an optional "controlled differential". This is also known as a limited slip/ or posi-traction rear end. Unlike a regular rear end, that directs power to the wheel with least traction, a controlled/posi rear end directs power to the wheel with most traction...meaning better traction and stability.
As far as the gear ratios offered here is a list by body style and any options. The ID Number is stamped on the front face of the carrier assembly. See picture at bottom with blue arrow pointing to ID Stamp.
ID Number Body Style/Option Gear Ratio
2 reg. body style/non AC 2.94 - 1
1 reg. body style/ AC 3.21 - 1(optional on non-AC reg. body styles)
6 75 series body style 3.36 - 1
7 Commercial Chassis 3.77 - 1(optional on 75 Series body styles)
Posi/Limited Slip was optional and was denoted by a G in front of the ID Number on the front face of the carrier. You can also determine a limited slip/posi traction by blocking the front wheels, and lifting the entire rear end up in the middle at the differential. Spin one of the tires. If both spin in the same direction it is a controlled/posi rear end. If they do not both spin in same direction or spin in opposite direction it is a regular rear end.
Other tell-tell signs is the special controlled differential label on the under side of the trunk lid and there is usually a metal ring around the differential filler plug that indicates it is a controlled differential and uses special lubricant.
Different Speedometer Gears used:
-57 to 64 Hydramatic (75 series), part # 351 1353, axle ratio 3.36, 21 teeth
-57 to 64 Hydramatic (75 series & 62 to 64 CC), part # 351 1354, axle ratio 3.77, 23 teeth
-59 to 63 Hydramatic (except 75 series, CC) and 1964 62 series, part # 351 1629, 2.94, axle ratio 2.94, 18 teeth
-59 to 63 Hydramatic (except 75 series, CC) and 1964 62 series, part # 351 1630, axle ratio 3.21, 20 teeth
-64 Turbo Hydramatic , part # A148 1859 axle ratio 3.21, 40 teeth
-64 Turbo Hydramatic, part # B135 9271, axle ratio 2.94, 37 teeth
-64 Turbo Hydramatic, part # A136 2049, axle ratio 3.77, 42 teeth
Location of Rear End ID Tag. With the "1" it is a 3.21 rear end.
If it was preceded by a "G" it would indicate a controlled (limited slip/Posi) rear end. Here is a picture of one with the G1 Stamped:
Comment
Clovis, I had the wheel bearings and seals replaced on the original axle this summer. However had some severe noice from the differential so was thinking of replacing the axle or try to replace the bearings. Found this axle at a reasonable price and decided to just exchange. Will keep the old and one day take it apart and repair the diff. When I do so expect a full story on this site.
Bought it from within Sweden.
Jason had one for a better price. But shipping and import costs made the price 3 times higher. So was calling around o everyone selling parts and in the end found this one from a reputable seller. Price was a little bit more expansive and the cost fro delivery was low. So I had the opportunity to blast and paint it and was still less in total cost than if I should have bought from Jason.
However if living in the states I wouldn't even consider buying from anybody else but Jason or Russ.
Anders, did you buy that locally or have it shipped from the States? If so, what was freight for something like that? Looks good too.
Very Nice! Nothing like freshly painted parts going back on the car.
Casting #'s often do no match Cadillac Parts #, especially for items that had multiple uses, or used in different setups. For example the casting # of the 1964 to 1967 Cylinder head is 1481395... one cylinder head casting for both sides; however the MPB RH part # is 363 2376, and LH part # is 363 2375.
There are literally thousands of examples of Casting #'s not matching part #'s. I would start simple and ask for the location of their casting #, or better yet send a picture, and look and see what casting # you have on your differential. If it the same, you are in luck. If it is different, it still could be for the same application, as I have seen casting #'s change even for the same part #!
Anders, ask them to take a picture. The piece I have has a different yolk or end piece that is held onto the pinion with a nut. That will need to be changed out to the piece you have on your car.
A different way of describing it, is it is the piece that the drive shaft bolts up to. Shipping will be about 90 bucks.
Started by Jason Edge in For Sale. Last reply by Jason Edge 21 hours ago. 1 Reply 4 Likes
To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue
Tags: ebay
Started by Chris Gill in Restoration Discussion. Last reply by Chris Gill on Wednesday. 4 Replies 0 Likes
Hi Folks, Just a word of warning here. Take it or leave it... I purchased almost $1,000 worth of carpets, custom mats, and bulk carpet from Stock Interiors over the past year for my 1963…Continue
Started by William Mott in 1963/64 Cadillac Specific Discussion. Last reply by Kurt on Wednesday. 12 Replies 0 Likes
Good Evening all,I just got the 63 caddy back on the road: cleaned up the tank, new sending unit, new Edelbrock electric fuel pump, and Edelbrock relief valve. Still had some vapor lock, but…Continue
Tags: AC
Started by Jason Edge in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 on Wednesday. 10 Replies 0 Likes
I have been intermittently working on parts Car #55, a 1963 Series 62 Four Window Sedan, between work on my new house addition project (ready to start floor framing once foundation and drainage is…Continue
Posted by Patrick Westphal on April 12, 2022 at 1:35pm 1 Comment 0 Likes
I was working on my HVAC system this winter and during the process of taking the dash pad off these two parts fell out. Does anyone know what they are and where they go?
ContinuePosted by Russell L Parr on April 1, 2022 at 9:15pm 6 Comments 0 Likes
I need to replace the bulbs for the speedometer cluster in my instrument panel..
Before I open up the dash, I want to have the necessary bulbs on hand.
Can someone help me determine what bulbs I need, the number of bulbs I need, and where to purchase them?
Your help will be greatly appreciated.
Posted by Russell L Parr on April 1, 2022 at 9:15pm 0 Comments 0 Likes
I need to replace the bulbs for the speedometer cluster in my instrument panel..
Before I open up the dash, I want to have the necessary bulbs on hand.
Can someone help me determine what bulbs I need, the number of bulbs I need, and where to purchase them?
Your help will be greatly appreciated.
Posted by SK on March 23, 2022 at 2:43pm 2 Comments 0 Likes
The temperature gauge of my 63 Eldorado does not work properly.
It goes slowly all the way up and stays there, while the true temperature is around 155-160 F (water in the radiator and/or the top of the thermostat housing).
Where should I start to solve the problem? The gauge itself, the temperature sensor, or the wiring? Or something else? The sensor is a new (aftermarket part)…
ContinueMay 22, 2022 from 8pm to 9:30pm – Zoom
0 Comments 0 LikesAdded by Kurt 2 Comments 1 Like
© 2022 Created by Jason Edge.
Powered by
You need to be a member of 63/64 Cadillac Website to add comments!
Join 63/64 Cadillac Website