Diff housing number and gearing
#3
I've got a 1970 442 4 speed car and it came from the factory with 3.23's A previous owner put in a Chebby 12 bolt with 4.10's and I agree with olds425, fun around town but without an overdrive freeway cruising isn't as much fun. I've always thought 3.42's are a good all around gear, fun to drive but not too bad on the highway. John
#4
The standard ratio for the 442 was 3.23 and limited slip was an option. I have a picture of the codes that should be on the tube to decipher it.
Here ya go.
OldsreadendIDcodes.jpg
Here ya go.
OldsreadendIDcodes.jpg
#5
#6
#7
John, Canadian built 442's came with Chebby 12 bolt's. Not sure why, but it might be the same reason as Canadian Pontiacs used Chebby engines. My 442 has the 3:42 limited slip and a W27 repro cover.
#9
Ken I didn't know that. But mines a Fremont build and I talked with the second owner who swapped the rear ends. I'm the fourth owner, the first had it 6 months then went to Viet Nam and sold the car to the second owner. He had it the longest and I've talked with both those owners. Mine was suppose to have been from the factory an M21 with a 3.23 so maybe it was ordered that way? By the time I got it the muncie had been swapped out for a super T10 and the chebby 12 bolt was under it.
1970_442, with an automatic and healthy 455 you should be fine with anything from the 3.08 to the 3.91 I drove a car with a mildly built 455 and TH400 with 2.56 gears for years. It wasn't quick off the line, but once you got it rolling it was OK and the 40 to 80 mph acceleration was snappy. So personal preference, how are you going to use the car and what do you want it to do. John
1970_442, with an automatic and healthy 455 you should be fine with anything from the 3.08 to the 3.91 I drove a car with a mildly built 455 and TH400 with 2.56 gears for years. It wasn't quick off the line, but once you got it rolling it was OK and the 40 to 80 mph acceleration was snappy. So personal preference, how are you going to use the car and what do you want it to do. John
#10
2.23s were standard, optional were 2.56, 2.78, 3.08, and 3.42.
Also note that with certain conditions, 4.33, 4.66, and 5.00 gear were available via dealer installation.
Thread
Thread Starter
Forum
Replies
Last Post
Zemanek889
Transmission and Driveline
5
July 14th, 2012 05:02 PM
jonstringer
Drivetrain/Differentials
11
May 24th, 2008 12:45 AM